A programme of consolidated-undrained triaxial strength tests has been conducted on three soil samples taken from the same soil horizon. The samples were initially 38mm in diameter by 76mm long. There was change in volume during consolidation, but no change in volume during the testing (positive volume changes are compressive). The results are shown in the table below. Determine an appropriate drained strength envelope for the soil. Test Sample depth, (m) Change in volume Deviator during consolidation, mL Cell Overall Pore water change in pressure at failure, kN/m? load at pressure, kN/m? failure, length, mm N 1 3 50 -0.5 126 6.1 -18 2 3 100 200 1.2 153 225 7.6 12 9. 3.7 8.2 57 Note: The area correction that should be applied to triaxial specimens is A=Ao(1-ɛv)/(1-ɛa)

A programme of consolidated-undrained triaxial strength tests has been conducted on three soil samples taken from the same soil horizon. The samples were initially 38mm in diameter by 76mm long. There was change in volume during consolidation, but no change in volume during the testing (positive volume changes are compressive). The results are shown in the table below. Determine an appropriate drained strength envelope for the soil. Test Sample depth, (m) Change in volume Deviator during consolidation, mL Cell Overall Pore water change in pressure at failure, kN/m? load at pressure, kN/m? failure, length, mm N 1 3 50 -0.5 126 6.1 -18 2 3 100 200 1.2 153 225 7.6 12 9. 3.7 8.2 57 Note: The area correction that should be applied to triaxial specimens is A=Ao(1-ɛv)/(1-ɛa)

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

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

A programme of consolidated-undrained triaxial strength tests has been conducted on
three soil samples taken from the same soil horizon. The samples were initially 38mm in
diameter by 76mm long. There was change in volume during consolidation, but no change
in volume during the testing (positive volume changes are compressive). The results are
shown in the table below.
Determine an appropriate drained strength envelope for the soil.
Test Sample
Change in volume Deviator
during
consolidation, mL
Cell
Overall
Pore water
load at change in pressure at
failure,
kN/m?
depth, pressure,
(m)
kN/m?
failure, length, mm
N
1
3
50
-0.5
126
6.1
-18
1.2
3.7
6.
100
153
7.6
12
3
9.
200
225
8.2
57
Note: The area correction that should be applied to triaxial specimens is A=Ao(1-ɛv)/(1-ɛa)

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