after the tank

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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6. A circular foundation of diameter 8 m supports a tank. The base of the foundation is at 1 m 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 kN/m3, dry unit weight of 17.6 kN/m3 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 this is so or not. 

 

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