a) An unconfined compression test is performed on a cohesive soil (having no fissures) with an initial diameter and height of 50 mm and 100 mm, respectively. Measured deformation and load at the time of failure are given as 4 mm and 184 N, respectively. Find the undrained shear strength of this soil sample. b) Also, an unconsolidated undrained (UU) triaxial test is performed on the same specimen under o3=100 kPa. Draw the total stress-based Mohr circles for both tests and plot the Mohr- Coulomb failure envelope.

a) An unconfined compression test is performed on a cohesive soil (having no fissures) with an initial diameter and height of 50 mm and 100 mm, respectively. Measured deformation and load at the time of failure are given as 4 mm and 184 N, respectively. Find the undrained shear strength of this soil sample. b) Also, an unconsolidated undrained (UU) triaxial test is performed on the same specimen under o3=100 kPa. Draw the total stress-based Mohr circles for both tests and plot the Mohr- Coulomb failure envelope.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

a) An unconfined compression test is performed
on a cohesive soil (having no fissures) with an
initial diameter and height of 50 mm and 100
mm, respectively. Measured deformation and
load at the time of failure are given as 4 mm and
184 N, respectively. Find the undrained shear
strength of this soil sample.
b) Also, an unconsolidated undrained (UU)
triaxial test is performed on the same specimen
under o3=100 kPa. Draw the total stress-based
Mohr circles for both tests and plot the Mohr-
Coulomb failure envelope.

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Soil
4. Please answer parts a and b
A cohesive soil sample is subjected to an unconfined compression test. The sample fails at a pressure of 3850 lb/ft2 [i.e., unconfined compressive strength lb/ft2]. Determine the soil’s cohesion. If an unconfined compression test is performed on the same clayey soil, what axial load can be expected at failure?