SOIL NAILING
Dr. A. K. Choudhary Professor & Ex-Head Department of Civil Engineering E-mail: [email protected] N.I.T. Jamshedpur - 831014
3/31/2020 Prof. A.K.Choudhary INTRODUCTION
Soil nailing is a technique used to reinforce and strengthen existing ground Soil nailing consists of installing closely spaced bars into a slope or excavation as construction proceeds from top down The grouted nails increases shear strength of overall soil mass.
3/31/2020 Prof. A.K.Choudhary TYPES OF SOIL NAIL
Screw anchor soil nail Grouted soil nail
3/31/2020 Prof. A.K.Choudhary
PROCEDURE OF SOIL NAILING
Excavate small cut Drill hole for nail Install & grout nail Place drainage strips, initial shotcrete layer & install bearing plates Repeat process to final grade Place final facing on permanent walls
3/31/2020 Prof. A.K.Choudhary
3/31/2020 Prof. A.K.Choudhary IDEAL CONDITIONS FOR SOIL NAILING
Height of excavation Excavation Face Inclination Type of soil Nail length Nail inclination Nail diameter Grouted hole diameter
3/31/2020 Prof. A.K.Choudhary APPLICATIONS
Landslide Remediation Railway embankments Roadway widening under existing bridges Stabilizing of existing retaining walls Highway embankments and cuttings
3/31/2020 Prof. A.K.Choudhary 3/31/2020 Prof. A.K.Choudhary
ADVANTAGES
Cost Time Applicable in almost all type of soils Construction equipments Performance Construction flexibility Environmental and aesthetic considerations
3/31/2020 Prof. A.K.Choudhary
LIMITATIONS
Temporary stand-up time Excavation below the water level Excavation in soft clay.
3/31/2020 Prof. A.K.Choudhary COMPARATIVE STUDY OF SOIL NAILING AND REINFORCED SOIL
Soil properties Method of installing reinforcing elements Construction process Facing Inclination of reinforcing elements
3/31/2020 Prof. A.K.Choudhary DESIGN STEPS
Feasibility Assessment Internal stability External stability
3/31/2020 Prof. A.K.Choudhary TYPICAL CROSS SECTION OF SOIL NAILED WALL
3/31/2020 Prof. A.K.Choudhary Salient Points
Soil nailing is a potential solution of landslide problems as it is economical and also applicable in seismic zones. It can solve the problem of residential area up to a great extent. It can be used in wide soil types.
3/31/2020 Prof. A.K.Choudhary
THANK YOU !!!!!!
3/31/2020 Prof. A.K.Choudhary