An undisturbed sample of soft clay is taken from a depth at which ao = 50kPa and o, = 100kPa.A specimen is set up in the triaxial cell and under fully drained condition is subjected co a final equal all-round pressure of 250 kPa. After primary consolidation, drainage valves are urned off and cell pressure is increased by 200 kPa and a pore water pressure of 200 kPa is measured. The specimen is then sheared by increasing the axial stress. At failure, the increase in

An undisturbed sample of soft clay is taken from a depth at which ao = 50kPa and o, = 100kPa.A specimen is set up in the triaxial cell and under fully drained condition is subjected co a final equal all-round pressure of 250 kPa. After primary consolidation, drainage valves are urned off and cell pressure is increased by 200 kPa and a pore water pressure of 200 kPa is measured. The specimen is then sheared by increasing the axial stress. At failure, the increase in

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

table and pumping is maintained for only 30 days (Yw-10 kN/m3, U=2 ).
3- An undisturbed sample of soft clay is taken from a depth at which oo = 50kPa and o, =
100kPa. A specimen is set up in the triaxial cell and under fully drained condition is subjected
to a final equal all-round pressure of 250 kPa. After primary consolidation, drainage valves are
turned off and cell pressure is increased by 200 kPa and a pore water pressure of 200 kPa is
measured. The specimen is then sheared by increasing the axial stress. At failure, the increase in
axial stress is Ao, = 160 kPa and the total measured pore water pressure is 344 kPa. For this
laboratory consolidated specimen compute:
a) undrained shear strength,
b) friction angle, Ø' and
c) compressive strength if the same specimen had been sheared to failure under fully drained
condition.

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