A circular foundation of diameter 8m supports a tank. The base of the foundation is at 1m below the ground surface. The vertical load is 20 MN. The tank foundation is supported by asoil with undrained shear strength equal to 80 kPa and saturated unit weight of 19m3'kNdry unit weight of 17.6kNand angle of internal friction equal to 25°. Ground water table is 4m3meters below the surface and assumed to be stable. Fourteen months after the tank was constructed, during a week of intense rainfall, the foundation failed. It was speculated thatfailure occurred by bearing capacity failure. Clarify whether is so or not.

Solution:- Given:- foundation diameter D=8m vertical load=20HN…

A circular foundation of diameter 8m supports a tank. The base of the foundation is at 1m below the ground surface. The vertical load is 20 MN. The tank foundation is supported by a soil with undrained shear strength equal to 80 kPa and saturated unit weight of 19*N, dry unit weight of 17. 6*N and angle of internal friction equal to 25°. Ground water table is 4 meters below the surface and assumed to be stable. Fourteen months after the tank was constructed, during a week of intense rainfall, the foundation failed. It was speculated that failure occurred by bearing capacity failure. Clarify whether is so or not.

A circular foundation of diameter 8m supports a tank. The base of the foundation is at 1m below the ground surface. The vertical load is 20 MN. The tank foundation is supported by a soil with undrained shear strength equal to 80 kPa and saturated unit weight of 19N, dry unit weight of 17. 6N and angle of internal friction equal to 25°. Ground water table is 4 meters below the surface and assumed to be stable. Fourteen months after the tank was constructed, during a week of intense rainfall, the foundation failed. It was speculated that failure occurred by bearing capacity failure. Clarify whether is so or not.

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

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

A circular foundation of diameter 8m supports a tank. The base of the foundation is at 1m below the ground surface. The vertical load is 20 MN. The tank foundation is supported by a
soil with undrained shear strength equal to 80 kPa and saturated unit weight of 19
m3'
kN
dry unit weight of 17.6
kN
and angle of internal friction equal to 25°. Ground water table is 4
m3
meters below the surface and assumed to be stable. Fourteen months after the tank was constructed, during a week of intense rainfall, the foundation failed. It was speculated that
failure occurred by bearing capacity failure. Clarify whether is so or not.

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