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 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 Drill hole for nail Install & nail Place drainage strips, initial shotcrete layer & install bearing plates Repeat process to final 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

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 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 .

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