Sample All round No. 1 2 pressure 1.0 2.0 Axial Pore stress Pressure 2.2 0.6 3.6 1.1 (i) Find total & effective shear strength parameters of soil. (ii) Find additional axial stress at which, the third identical specimen of the same soil will fail if all round pressure is 2.8 kg/cm².

Sample All round No. 1 2 pressure 1.0 2.0 Axial Pore stress Pressure 2.2 0.6 3.6 1.1 (i) Find total & effective shear strength parameters of soil. (ii) Find additional axial stress at which, the third identical specimen of the same soil will fail if all round pressure is 2.8 kg/cm².

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.12P: Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below...

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Concept explainers

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

Two identical specimens of a backfill soil, when tested in a triaxial compression test, gave the following stresses (in kg/ cm²) at failure.

Sample All round
No.
1
2
pressure
1.0
2.0
Axial
Pore
stress Pressure
2.2
0.6
3.6
1.1
(i) Find total & effective shear strength parameters of soil.
(ii) Find additional axial stress at which, the third identical
specimen of the same soil will fail if all round pressure
is 2.8 kg/cm².

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