DOCSLIB.ORG

Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Index Properties

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Index Properties 06 Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Index properties Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Review Clay particle-water interaction Identification of clay minerals Sedimentation analysis Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay 20 - 40 Hydrometer analysis 0.995 130 - 150 Hydrometer is a device which is used to measure the specific 1.030 gravity of liquids. 10 - 20 4.7 φ 50 60 29 -31 φ (All dimensions 50 are in mm) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Hydrometer Analysis -For a soil suspension, the particles start settling down right from the start, and hence the unit weight of soil suspension varies from top to bottom. Measurement of specific gravity of a soil suspension (Hydrometer) at a known depth at a particular time provides a point on the GSD. Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Process of Sedimentation of Dispersed Specimen W VW w 1 V S WS VS = Ws/(Gsγw) Vw = [1 -Ws/(Gsγw)] γ γ Initial unit weight of a i = [Ws+ wVw]/1 unit volume of suspension γi = [γw + Ws(Gs-1)/(Gs)] Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Process of Sedimentation of Dispersed Specimen Size d of the particles which have settled from the surface z dz through depth z in time t X X d (From Stroke’s Law): 18µ z d = (Gs −1)γ w td Note: Above the level X – X, no particle of size > d will be present. In elemental depth dz, suspension may be uniform and particles of the size smaller than d exist. Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Process of Sedimentation of Dispersed Specimen If the percentage of weight of particles finer than d (already sedimented) to the original weight of soil solids in the suspension is N′ Then: Weight of solids per unit volume of suspension at depth z = (N′)(W/V) (i.e. Ws = W/V) Unit Weight of suspension after elapsing time td at depth z is γz = [γw + N′(W/V)(Gs-1)/(Gs)] N′ = [GS/(GS-1)[γz - γw](V/W) N′ in % Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Process of Sedimentation of Dispersed Specimen But γz = GSSγw = (1 + Rh/1000) γw Where GSS = Sp. Gravity of Soil Suspension (Graduated on hydrometer from 0.995 – 1.030) Rh is the reading on Hydrometer N′ = [GS/(GS-1)](Rh/1000) (V/W) = (GS/(GS-1) (Rh/W) For V = 1000 c.c. Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Calibration or Immersion correction for Hydrometer H Vh/(AJ) x´ x´ x x y´ h/2 h y´ e h = height of the bulb y y H = Height of any reading Rh Vh/(2AJ) AJ = Area of C/S of Jar Vh = Vol. of hydrometer Before the immersion After the immersion of hydrometer of hydrometer he = [H+h/2+Vh/(2AJ)-Vh/AJ) = (H+h/2) - Vh/(2AJ) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Conversion of Rh = 0; Gss = 1.00 Rh into He R = (G -1)103 h SS He1 he Rh = 30; Gss = 1.030 Plot of Rh with He – Valid for a particular He2 hydrometer he = He1-[(He1-He2)/30]Rh up to 4 min. he = He1-[(He1-He2)/30]Rh – Vh/(2AJ) after 4 min. Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Hydrometer corrections N′ = (GS/(GS-1) R/W R = Rh+ Cm ± Ct - Cd N = N′[W /W ] R = Corrected observed combined 75 T reading Where, W75 = Wt. of soil passing 75µ WT = Total wt. of Soil taken for combined Sieve and Hydrometer Analysis Cm = Meniscus correction (Always + ) Because density readings increase downwards Ct = + for T > 27°C (Rh will be less than what it should be) = - for T < 27 °C (Rh will be more than what it should be) Cd = Always Negative (Dispersion agent concentration!!) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay µ Example on Hydrometer analysis (kaolin) Given Data: Volume of suspension = 1000 ml Volume of hydrometer, Vh= 90 cc Weight of dry soil, Ms = 50 g Specific gravity of soil, G = 2.62 2 Cross- sectional area of jar, Aj = 31.0075 cm Room temperature, T = 27º C Dispersing agent correction, Cm= 0.0004 Meniscus correction, Cd= 0.0034 Temperature correction, Ct = 0.9965 Viscosity of water, = 8.545 x 10-7 kN-sec/m2 Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Example on Hydrometer analysis (kaolin) H’e1 = Maximum depth to centre of bulb from Rh = 0.995 = 21 cm H’e2 = Maximum depth to centre of bulb from Rh = 1.030 = 9 cm At t = 2 min, Rh = 1.0285 Since H’e varies linearly with reading Rh Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Example on Hydrometer analysis (kaolin) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Example on Hydrometer analysis (kaolin) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Example on Hydrometer analysis 100 80 60 Percent finer (%) 40 20 0 0.001 0.01 0.1 1 Particle size (mm) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Limitations of Stroke’s law -Soil particles are not truly spherical and sedimentation is done in a jar (For d > 0.2 mm causes turbulence in water and d < 0.0002 mm Brownian movement occurs (too small velocities of settlement) --- Can be eliminated with less concentrations. -Floc formation due to inadequate dispersion -Unequal Sp.Gr of all particles (insignificant for soil particles with fine fraction) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Measures of Gradation D60 = dia. of soil particles for which 60 % of the particles are finer. (i.e. 60 % of the particles are finer and 40 % coarser than D60) D10: Effective Particle Size D50 : Average Particle Size (10 % Finer and 90 % coarser than D10 size) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Measures of Gradation -Engineers frequently like to use a variety of coefficients to describe the uniformity versus the well-graded nature of soils. D30 = 0.3 mm Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Measures of Gradation Some commonly used measures are: The uniformity coefficient Cu = D60/D10 Soils with Cu < 4 are considered to be poorly graded or uniform. Cu > 4 – 6 Well Graded Soil Coefficient of Gradation or Curvature 2 Cc = (D30 )/(D60*D10) Cc = 1- 3 Soil is well-graded. Higher the value of Cu the larger the range of particle sizes in the soil Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Typical characteristics of GSD curves -Steep Curves ⇒ Low Cu values ⇒ Poorly graded soil (Uniformly graded). (Cu < 5 for uniform soils) -Flat Curves ⇒ High Cu values ⇒ Well graded soil. -Most gap graded soils have a Cc outside the range. (an absence of intermediate particle sizes) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Typical GSDs for Residual soils Young residual Intermediate maturing Fully maturing ⇒ A residual deposit has its particle sizes constantly changing with time as the particles continue to break down… GSD can provide an indication of soil’s history Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Typical GSDs for Transported soils Glacial Glacial-Alluvial River deposits may be well-graded, uniform or gap-graded, depending up on the water velocity, the volume of suspended solids, and the river area where deposition occurred. Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Grain Size Curves for different soils Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Particle size distribution of Bentonite, Illite, and Kaolinite clay After Koch (2002) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Gradation % Gravel = 0 % Sand = (100 – 60) = 40 % Silt = (60 – 12) = 48 % Clay = 12 % Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Example problem Determine the percentage of gravel (G), Sand (S), Silt (M), and Clay (C) of soils A,B and C Soil C: 0%G; 31%S; 57%M; 12%C (Well graded sandy silt) Soil B: 0%G; 61%S; 31%M; 7%C (Well graded silty sand) Soil A: 2%G; 98%S; 0%M; 0%C (Poorly-graded sand) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Some applications of GSA in Geotechnology and construction Embankment -Selection of fill material Earth Dams -Road Sub-Base Material -Drainage Filters -Ground Water Drainage -Grouting and Chemical Injection -Concreting Materials -Dynamic Compaction Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Practical Significance of GSD -GSD of soils smaller than 0.075 mm (#200) is of little importance in the solution of engineering problems. GSDs larger than 0.075 mm have several important uses. 1) GSD affects the void ratio of soils and provides useful information for use in cement and asphalt concretes. (Well graded aggregates require less cement per unit of volume of concrete to produce denser concrete, less permeable and more resistant to weathering) Prof. B V S Viswanadham, Department of Civil Engineering, IIT Bombay Practical Significance of GSD 2) A knowledge of the amount of percentage fines and the gradation of coarse particles is useful in making a choice of material for base courses under highways, runways, rail tracks etc., 3) To determine the activity of clay based on percentage clay fraction (<2µ) 4) To design filters (Filters are used to control seepage) and pores must be small enough to prevent particles from being carried from the adjacent soil.
Load more

Recommended publications
  • Earthquake Ground Motions at Soft Soil Sites
    Missouri University of Science and Technology Scholars' Mine International Conferences on Recent Advances 1991 - Second International Conference on in Geotechnical Earthquake Engineering and Recent Advances in Geotechnical Earthquake Soil Dynamics Engineering & Soil Dynamics 13 Mar 1991, 4:30 pm - 5:00 pm Earthquake Ground Motions at Soft Soil Sites I. M. Idriss University of California, Davis, CA Follow this and additional works at: https://scholarsmine.mst.edu/icrageesd Part of the Geotechnical Engineering Commons Recommended Citation Idriss, I. M., "Earthquake Ground Motions at Soft Soil Sites" (1991). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 3. https://scholarsmine.mst.edu/icrageesd/02icrageesd/session12/3 This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License. This Article - Conference proceedings is brought to you for free and open access by Scholars' Mine. It has been accepted for inclusion in International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics by an authorized administrator of Scholars' Mine. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected]. Proceedings: Second International Conference on Recent Advances In Geotechnical Earthquake Engineering and Soli Dynamics, March 11-15, 1991 St. Louis, Missouri, lnvHed Paper LP01 Earthquake Ground Motions at Soft Soil Sites I. M. ldriss Department of Civil Engineering, University of California, Davis, USA development of evaluation and design methods that revolutionized INTRODUCTORY REMARKS many aspects of engineering practice and thinking. One area of research that Professor H.
    [Show full text]
  • Nov-Dec Geo 2014 Final Sean.Indd
    32 Geotechnical 38 Sinkhole Investigation 44 KarstIC FOUNDATION 50 Karst-Related Design over Karst and Grouting VARIABILITY Sinkholes NOVEMBER // DECEMBER 2014 INSIDE: INTERNATIONAL FOUNDATIONS CONGRESS AND EQUIPMENT EXPO INTERNATIONAL CONFERENCE PREVIEW PROGRAM FOUNDATIONSIFCEE 2015 CONFERENCE PREVIEW CONGRESS & EQUIPMENT March 17-21, 2015 JW Marriott San Antonio Hill Country Resort & Spa EXPO San Antonio, Texas, U.S.A. 10/22/14 11:40 AM IFCEE_Preview_Geostrata.indd 1 Karst AND Sinkholes DETECTION, REMEDIES, AND LEGAL CONSEQUENCES Proudly published by the Geo-Institute of ASCE GEOPIER IS GROUND IMPROVEMENT.™ Work with engineers worldwide to solve your ground improvement challenges. THE GEOPIER SRT SYSTEM: LOW-IMPACT SLOPE STABILITY WE HELP YOU FIX BAD GROUND. An existing slope along the high occupancy travel lanes of the I-495 Capital Beltway in Fairfax, Virginia had an For more information call 800-371-7470, unacceptable factor of safety against sliding. The slope was e-mail [email protected] or visit geopier.com. a perfect application for the Geopier SRT system. SRT is a slope reinforcement technology that uses rigid steel Plate Pile™ elements to stabilize shallow failing slopes or reinforce marginally stable slopes. The use of small, mobile equipment allowed for the work to be performed directly on the slope with no interruption of traffic. This project demonstrated that the SRT system can successfully be installed along roadways with difficult access, while decreasing construction time and earthwork operations. ©2014 Geopier Foundation Company, Inc. The Geopier® technology and brand names are protected under U.S. patents and trademarks listed at www.geopier.com/patents and other trademark applications and patents pending.
    [Show full text]
  • ISSMGE Bulletin
    ISSMGE Bulletin Volume 3, Issue 4 December 2009 International Society for Soil Mechanics and Geotechnical Engineering www.issmge.org A Message from the President I NSIDE T HIS I SSUE 90 Day Progress Report 1 A Message from the President By Jean‐Louis Briaud [email protected] 5 Views of Young Geotechnical Dear Colleagues, Engineers You elected me approximately 90 days ago and I can assure you that it was one of the major highlights of my professional 8 Reminiscences career. I appreciated the large number of congratulatory emails, letters, and phone calls that I received. I tried to answer every 11 Case History one of them but may have missed a few. I also appreciated the photos that you sent me of the conference as I was so busy that 19 TC Activity I did not have time to take any pictures or even go see the Pyramids. But our hosts, led by Mamdouh Hamza, deserve so much credit for all the work they did and the great success of 22 News the Alexandria Conference. I enjoyed myself thoroughly. 30 Announcement As soon as I was elected I started to work and this is a short report on the progress I have made over the last 90 days with Editorial Remarks 32 the help of the ISSMGE Board, the Secretary General, and many of you as well. This first effort is part of my broader vision for the Event Diary 33 next four years which you can find on my web site in a few languages (https://ceprofs.civil.tamu.edu/briaud/).
    [Show full text]
  • San Bernardino & Riverside Counties Branch Los
    SAN BERNARDINO & RIVERSIDE COUNTIES BRANCH LOS ANGELES SECTION , REGION 9-SINCE 1953 PRESIDENTS MESSAGE September 2012 The 2011-2012 fiscal year of the branch is coming to an end, and I would like to take this opportunity with my last president message to thank each board member for their dedication, hard work and commitment to the San Bernardino and Riverside Counties Branch. We had an excellent year and it would not have been possible without their help. Although there have been many challenges, there have been even more wonderful memories made during my journey as president that will always hold a special place in my heart. We’ve had many successful events this past year such as lunches with great speakers, our tour to the American Asphalt Company, Engineering Week, and the golf event to name a few. I sincerely hope that all of you enjoyed these events that we prepared for you. I also want to encourage all NEWSLETTER of you to voice your opinion. Let the new Board members know which events worked the best and even share some topics or ideas that you may have for a lunch meeting. This is the time to do it, as they will be happy to incorporate any feedback that you have. With your input, I am confident that next year will be just as successful as this past year has been. Finally, I would like to say that it has been an honor and a pleasure to serve you as the 2011- 2012 branch President and I want to thank all the members for their continued support and com- mitment to the San Bernardino and Riverside counties Branch.
    [Show full text]
  • Download Chapter 168KB
    Memorial Tributes: Volume 5 HARRY BOLTON SEED 246 Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 5 HARRY BOLTON SEED 247 Harry Bolton Seed 1922–1989 By James K. Mitchell Harry Bolton Seed was born in Bolton, England, on August 19, 1922. He studied at King's College, London University, receiving the B.Sc. in civil engineering in 1944 and the Ph.D. in structural engineering in 1947. Following two years as assistant lecturer at King's, he came to the United States to study soil mechanics at Harvard University under the tutelage of Karl Terzaghi and Arthur Casagrande. He received the S.M. from Harvard in 1948 and spent the next year as an instructor. This was followed by a year as a foundation engineer for Thomas Worcester, Incorporated, in Boston. In 1950 Professor Seed joined the civil engineering faculty at the University of California, where he spent the remainder of his career as an engineering educator, researcher in geotechnical. engineering, and consultant to numerous companies and government agencies. He built the program in geotechnical engineering at Berkeley into one of the largest and best in the world. A major factor in this development was his bringing colleagues together from different areas of geotechnical engineering, including geological engineering and rock mechanics, as well as soil mechanics and foundation engineering. He served as chairman of the Civil Engineering Department from 1965 to 1971, a period during which it rose to number one ranking in the United States for the quality of its graduate programs. Professor Seed had an enormous impact on every area of Copyright National Academy of Sciences.
    [Show full text]
  • Iuinwnmiihumi
    1 iuinwnmiihumi A II S A I INFLUENCIAE ALAS CONDICIONES LOCALES 'DEL SUELO ÉkN''MOVIMIENTOS DEL TERRENO ;,* EN, DAÑOSaA EDIFICIOSDURANTE SISMOS HARRY BOLTON SEED OCTAVA CONFERENCIA NABOR CARRILLO Presentada en la Sociedad Mexicana de Mecánica de Suelos en la XIII Reunión Nacional, Mazatlán, Sinaloa, México México, Noviembre 22, 1986 HARRY BOLTON SEED 1;._. : i . 13 13' 16 r Or TECA yEEpW flEOW{RDO Sa Copyright, México, 1990 SOCIEDAD MEXICANA DE MECANICA DE SUELOS, A.C. Valle de Bravo No. 19, Col. Vergel de Coyoacán 14340 México, D.F., MEXICO Los derechos de autor fueron generosamente cedidos a la SMMS por el Profesor H. Bolton Seed. Presidente del Comité Organizador: Juan Jacobo Schmitter Traducción de la versión en Español: Por personal de la Secretaría de Comunicaciones y Transportes bajo la dirección de Alfonso Rico Rodríguez. Revisión y corrección de estilo: Raúl Esquivel Díaz DibujoyMontaje:PersonaldelaSubdirecciónGeneralde Conducciones y Captaciones SARH y Everardo Fuentes de la Rosa Mecanografía: Yolanda Briseño Almaraz Edición: Juan Jacobo Schmitter y Francisco González Valencia Impreso en México. Prohibida su repoducción por cualquier medio sin previa autorización por escrito de la SMMS. Lasopinionesydatospresentadossondelaexclusiva responsabilidaddelautor.La SMMS noasume ninguna responsabilidad por las opiniones y declaraciones contenidas en esta publicación. pt b. ti r.;4. 2318 I N D I C E TRIBUTO A HARRY BOLTON SEED. Miguel P. Romo Organista VII PRESENTACION DEL CONFERENCISTA Juan J. Schmitter IX CURRICULUM VITAE DEL CONFERENCISTA XI CONFERENCIA "Influencia de las Condiciones Locales del Suelo en MovimientQs delTerreno y en Dar?os a Edificios Durante Sismos" 1 SESION DE PREGUNTAS Y RESPUESTAS 17 3 BASES DE LA CONFERENCIA NABOR CARRILLO 18 8 V TRIBUTO A HARRY BOLTON SEED por Miguel P.
    [Show full text]
  • Downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)
    INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND GEOTECHNICAL ENGINEERING This paper was downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). The library is available here: https://www.issmge.org/publications/online-library This is an open-access database that archives thousands of papers published under the Auspices of the ISSMGE and maintained by the Innovation and Development Committee of ISSMGE. The paper was published in the proceedings of XVI Pan- American Conference on Soil Mechanics and Geotechnical Engineering (XVI PCSMGE) and was edited by Dr. Norma Patricia López Acosta, Eduardo Martínez Hernández and Alejandra L. Espinosa Santiago. The conference was held in Cancun, Mexico, on November 17-20, 2019. From Research to Applied Geotechnics 5 N.P. López-Acosta et al. (Eds.) © 2019 The authors and IOS Press. This article is published online with Open Access by IOS Press and distributed under the terms of the Creative Commons Attribution Non-Commercial License 4.0 (CC BY-NC 4.0). doi:10.3233/ASMGE190004 Geotechnical Engineering in Spatially Variable Soft Soils. The Case of Mexico City. The 9th Arthur Casagrande Lecture Ingeniería geotécnica en suelos blandos con variación espacial. El caso de la Ciudad de México. La 9.a Conferencia Arthur Casagrande by Gabriel Y. AUVINET Professor, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Mexico City, Mexico [email protected] prepared for XVI Pan-American Conference on Soil Mechanics and Geotechnical Engineering Cancún, Mexico November, 2019 6 G.Y. Auvinet / Geotechnical Engineering in Spatially Variable Soft Soils The 9th Arthur Casagrande Lecture Gabriel Y.
    [Show full text]
  • Memorial Tributes: Volume 5
    THE NATIONAL ACADEMIES PRESS This PDF is available at http://nap.edu/1966 SHARE Memorial Tributes: Volume 5 DETAILS 305 pages | 6 x 9 | HARDBACK ISBN 978-0-309-04689-3 | DOI 10.17226/1966 CONTRIBUTORS GET THIS BOOK National Academy of Engineering FIND RELATED TITLES Visit the National Academies Press at NAP.edu and login or register to get: – Access to free PDF downloads of thousands of scientific reports – 10% off the price of print titles – Email or social media notifications of new titles related to your interests – Special offers and discounts Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the National Academies Press. (Request Permission) Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 5 i Memorial Tributes National Academy of Engineering Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 5 ii Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 5 iii National Academy of Engineering of the United States of America Memorial Tributes Volume 5 NATIONAL ACADEMY PRESS Washington, D.C. 1992 Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 5 MEMORIAL TRIBUTES iv National Academy Press 2101 Constitution Avenue, NW Washington, DC 20418 Library of Congress Cataloging-in-Publication Data (Revised for vol. 5) National Academy of Engineering. Memorial tributes. Vol. 2-5 have imprint: Washington, D.C. : National Academy Press. 1. Engineers—United States—Biography. I. Title. TA139.N34 1979 620'.0092'2 [B] 79-21053 ISBN 0-309-02889-2 (v.
    [Show full text]
  • Memorial Tributes: Volume 13
    THE NATIONAL ACADEMIES PRESS This PDF is available at http://nap.edu/12734 SHARE Memorial Tributes: Volume 13 DETAILS 338 pages | 6 x 9 | HARDBACK ISBN 978-0-309-14225-0 | DOI 10.17226/12734 CONTRIBUTORS GET THIS BOOK National Academy of Engineering FIND RELATED TITLES Visit the National Academies Press at NAP.edu and login or register to get: – Access to free PDF downloads of thousands of scientific reports – 10% off the price of print titles – Email or social media notifications of new titles related to your interests – Special offers and discounts Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the National Academies Press. (Request Permission) Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 13 Memorial Tributes NATIONAL ACADEMY OF ENGINEERING FFrontront MMatter.inddatter.indd i 33/23/10/23/10 33:40:26:40:26 PMPM Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 13 FFrontront MMatter.inddatter.indd iiii 33/23/10/23/10 33:40:27:40:27 PMPM Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 13 NATIONAL ACADEMY OF ENGINEERING OF THE UNITED STATES OF AMERICA Memorial Tributes Volume 13 THE NATIONAL ACADEMIES PRESS Washington, D.C. 2010 FFrontront MMatter.inddatter.indd iiiiii 33/23/10/23/10 33:40:27:40:27 PMPM Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 13 International Standard Book Number-13: 978-0-309-14225-0 International Standard Book Number-10: 0-309-14225-3 Additional copies of this publication are available from: The National Academies Press 500 Fifth Street, N.W.
    [Show full text]
  • Department Seminar
    Department Seminar On the complexity of seismic waves trapped in shallow geologic features Speaker: Prof. Domniki Asimaki, California Institute of Technology (Caltech), USA Date and Time: February 11th, 9 pm Link: Click here to join the meeting! Abstract: Most earthquake engineering and seismological models make the sweeping assumption that the world is flat. The ground surface topography, however, has been repeatedly shown to strongly affect the amplitude, frequency, duration and damage induced by earthquake shaking, effects mostly ignored in earthquake simulations and engineering design. In this talk, I will show a collection of examples that highlight the effects of topography on seismic ground shaking, and I will point out what these results suggest in the context of the current state-of-earthquake engineering practice. Examples will range from semi-analytical solutions of wave propagation in infinite wedge to three-dimensional numerical simulations of topography effects using digital elevation map-generated models and layered geologic features. I will conclude by demonstrating that ‘topography’ effects vary strongly with the stratigraphy and inelastic behavior of the underlying geologic materials, and are in fact much less topography-dependent than commonly understood. Speaker Bio: Domniki Asimaki is a Professor of Mechanical and Civil Engineering at Caltech. She has a bachelor’s diploma from the National Technical University of Athens, Greece (1998), and an MS (2000) and PhD (2004) from the Department of Civil and Environmental Engineering at MIT. Her research focuses on the understanding and simulation of 3D site effects, and their impact on the design and performance of geotechnical systems. She has been on the ASCE GeoInstitute Board of Governors since 2018; and is an associate editor for the ASCE Journal of Geotechnical and Geoenvironmental Engineering, for Earthquake Spectra, and for the Bulletin of Earthquake Engineering.
    [Show full text]
  • Investigation of Liquid Limit of Kamloops Silt by Soft-Base Casagrande Apparatus
    Investigation of Liquid Limit of Kamloops Silt by Soft-base Casagrande Apparatus and British Drop-Cone Penetrometer by Alan Zhong Lu A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF BACHELOR OF APPLIED SCIENCE in THE FACULTY OF APPLIED SCIENCE (Geological Engineering) This thesis conforms to the required standard ……………………………………….. Dr. R. Jonathan Fannin THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) MAY 2010 © Alan Zhong Lu, 2010 2010 Investigation of Liquid Limit of Kamloops Silt by Soft-base Casagrande Apparatus and British Drop-Cone Penetrometer Alan Zhong Lu The University of British Columbia 4/9/2010 ABSTRACT This study was to investigate the liquid limit of Kamloops silt using two world-wide popular testing apparatus: Casagrande device and British style Drop-Cone penetrometer. The testing with Casagrande device was conducted by a group of soil mechanics students in accordance with ASTM D423-61T (1961); the testing with British style Drop-Cone penetrometer was performed by two senior undergraduate engineering students in accordance with BS 1377 (1975). The liquid limit of Kamloops silt was found to be approximately 23%. The results obtained by both apparatus agreed to each other quite well, so these two testing methods can be alternative of each other. However, using Drop-Cone penetrometer required less experience of the operator and yielded results more easily and quickly than using Casagrande device. This paper also introduced the concept and the significance of Atterberg Limits, and summarized the development of Casagrande method by Arthur Casagrande and the evolution of Drop-Cone penetrating method. ii TABLE OF CONTENTS Page Abstracts ……………………………………………………………………….
    [Show full text]
  • Earthquake Ground Motions at Soft Soil Sites
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Missouri University of Science and Technology (Missouri S&T): Scholars' Mine Missouri University of Science and Technology Scholars' Mine International Conferences on Recent Advances 1991 - Second International Conference on in Geotechnical Earthquake Engineering and Recent Advances in Geotechnical Earthquake Soil Dynamics Engineering & Soil Dynamics 13 Mar 1991, 4:30 pm - 5:00 pm Earthquake Ground Motions at Soft Soil Sites I. M. Idriss University of California, Davis, CA Follow this and additional works at: https://scholarsmine.mst.edu/icrageesd Part of the Geotechnical Engineering Commons Recommended Citation Idriss, I. M., "Earthquake Ground Motions at Soft Soil Sites" (1991). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 3. https://scholarsmine.mst.edu/icrageesd/02icrageesd/session12/3 This Article - Conference proceedings is brought to you for free and open access by Scholars' Mine. It has been accepted for inclusion in International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics by an authorized administrator of Scholars' Mine. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected]. Proceedings: Second International Conference on Recent Advances In Geotechnical Earthquake Engineering and Soli Dynamics, March 11-15, 1991 St. Louis, Missouri, lnvHed Paper LP01 Earthquake Ground Motions at Soft Soil Sites I. M. ldriss Department of Civil Engineering, University of California, Davis, USA development of evaluation and design methods that revolutionized INTRODUCTORY REMARKS many aspects of engineering practice and thinking.
    [Show full text]