The Concept, Analysis and Critical Thinking Involved in Flow Net Theory - a Project Based Learning Approach Using Cofferdams
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University of Southern Queensland Faculty of Engineering and Surveying The Concept, Analysis and Critical Thinking Involved in Flow Net Theory - A Project Based Learning Approach Using Cofferdams A dissertation submitted by Joseph Edward Marstella In fulfillment of the requirements of Courses ENG4111 and ENG4112 Research Project towards the degree of Bachelor of Engineering (CIVIL) Submitted: October, 2010 iii Certification I certify that the ideas, designs and experimental work, results, analyses and conclusions set out in this dissertation are entirely my own effort, except where otherwise indicated and acknowledged. I further certify that the work is original and has not been previously submitted for assessment in any other course of institution, except where specifically stated. Joseph Edward Marstella Student Number: 0050071866 _______________________________________ Signature _______________________________________ Date iv University of Southern Queensland Faculty of Engineering and Surveying ENG4111 Research Project Part 1 & ENG4112 Research Project Part 2 Limitations of Use The Council of the University of Southern Queensland, its Faculty of Engineering and Surveying, and the staff of the University of Southern Queensland, do not accept any responsibility for the truth, accuracy or completeness of material contained within or associated with this dissertation. Persons using all or any part of this material do so at their own risk, and not at the risk of the Council of the University of Southern Queensland, its Faculty of Engineering and Surveying or the staff of the University of Southern Queensland. This dissertation reports an educational exercise and has no purpose or validity beyond this exercise. The sole purpose of the course "Project and Dissertation" is to contribute to the overall education within the student‟s chosen degree program. This document, the associated hardware, software, drawings, and other material set out in the associated appendices should not be used for any other purpose: if they are so used, it is entirely at the risk of the user. Professor Frank Bullen Dean Faculty of Engineering and Surveying v Acknowledgement I would like to thank my friends and family for their continued support throughout my degree duration. I would particularly like to thank Dr Jim Shiau for his knowledge, assistance, support and input into this piece of professional literature. Without the support of Dr Jim Shiau, my family and friends it would have been near impossible for me to progress this far through my education and produce a dissertation such as this. The support of my mother and father has been greatly appreciated throughout the course of my research project. Thanks must also go to my close friends for their continued encouragement and support. The USQ faculty and its members have been extremely helpful with the physical and practical work involved in this research project. This thesis represents the combined efforts of many people that I have drawn on for information, inspiration and support. vi Abstract The concept of project based learning is best presented in the following scenario: Figure 1.0 Possible Cofferdam Construction Site This is a project based learning task involving research in relation to the design of a cofferdam. The following scenario was presented to a student by a project supervisor for a final year research project (ENG4111 Research Project Part 1 and ENG4112 Research Project Part 2). “Imagine you are a graduate civil engineer working for a Geotechnical Consulting firm. Your boss confronts you one day and gives you a photograph of a possible project site (Figure 1.0). Your boss is a typical business manager with non-technical experience in relation to geotechnical engineering. He/She may be incredibly vague as to what project analysis is required for the problem and would be only interested superficially from a cost-benefit perspective. It is your job, as a geotechnical engineer, to do a preliminary investigation of the possible project site. You must present and discuss implications that may arise through your analysis. Address the investigation and present outcomes in a professional manner and demonstrate your critical thinking, concepts and assumptions. Present all findings in your dissertation. The last date to submit the dissertation is 28 October 2010.” vii Table of Contents Certification ............................................................................................................................................................ iv Limitations of Use .................................................................................................................................................... v Acknowledgement ................................................................................................................................................... vi Abstract .................................................................................................................................................................. vii List of Figures ....................................................................................................................................................... xiii List of Tables ........................................................................................................................................................ xiv List of Nomenclature .............................................................................................................................................. xv Chapter 1 .................................................................................................................................................................. 1 1.0 Introduction ................................................................................................................................................. 2 1.1Background and introduction ........................................................................................................................... 2 1.2 Objectives and problem definition .................................................................................................................. 3 1.3 Organization of thesis ..................................................................................................................................... 5 1.4 Preliminary Scenario ...................................................................................................................................... 6 Chapter 2 .................................................................................................................................................................. 7 2.0 Breakdown of works for flow nets ...................................................................................................................... 8 2.1 Synopsis ......................................................................................................................................................... 8 2.2 Introduction .................................................................................................................................................... 8 2.3 Brainstorming Approach ................................................................................................................................ 9 2.4 Approach to examine problem ...................................................................................................................... 12 2.5 Review of flow net theory ............................................................................................................................ 13 History of flow net use .......................................................................................................................... 14 Engineering process required prior to flow net investigation .................................................................. 15 What is a cofferdam ? ............................................................................................................................ 16 Permeability .......................................................................................................................................... 16 Quicksand condition .............................................................................................................................. 18 Process of flow net construction ............................................................................................................ 18 Behaviour of water in soils - Permeability ............................................................................................. 20 Calculations involved in flow nets ......................................................................................................... 22 The development of flow net theory ...................................................................................................... 24 Conclusion ............................................................................................................................................ 25 2.6 Causes for flow net error .............................................................................................................................. 25 2.7 Calculation correction for flow nets .............................................................................................................. 26 2.8 Assumptions made in relation to flow nets ...................................................................................................