soil nailing :a potential solution to landslide problemsnitjsr.ac.in/course_assignment/ce10ce-...

SOIL NAILING

Dr. A. K. Choudhary

Professor & Ex-Head

Department of Civil Engineering

E-mail: drakchoudharycivil@gmail.com

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