Reinforced Slopes and

Embankments

Nanjundaswamy P.

SJCE, Mysore

Functions of Reinforcement

Permit increased compaction to stiffen the embankment (near shoulder and overall)

Enable the embankment to be steepened

Assist in internal stability problems

Assist in overall stability problems

Assist in foundation stability problems

Available Land

Widening

Noise Barriers

Poor quality fills

Pressure relief walls

Mesh facing

Soft face with berms

Green faced

Failure modes

Failure modes

Failure modes

Analysis

Resisting MomentFS = -----------------------------

Disturbing Moment

Trial Surfaces

Analysis

On Soft Soil

Bearing Failure

Rotational Failure

Lateral Spreading

Total Settlement

Differential Settlement

Foundation Mattress

Example -1

8.0m

4.0m

17.2m

15.2m

17.8m

Li

1

1

Foundation Mattress

Ultimate bearing capacity

qu = 5.14 C for soft clay

Factor of safety against bearing capacity failure

qu

FS = -------

pu

pu = Load intensity

16 m

10 m

2 m

22 m

2 m1 m

A

A

Foundation Mattress