A circular foundation of diameter 8 m supports a tank. The base of the foundation is at 1 m from the ground surface. The vertical load is 20 MN. The tank foundation was designed for short-term loading conditions (su = 80 kPa and Ysat = 19 kN/m³). The groundwater level when the tank was initially designed was at 4 m below the ground surface. It was assumed that the groundwater level was stable. However, Fourteen months after the tank was constructed and during a week of intense rainfall, the groundwater table reached the base of the circular footing and the tank foundation failed. It was speculated that failure occurred by bearing capacity failure. As a result of your calculations, establish and show whether this is correct or not. The friction angle is $'p = 25° from simple shear tests. 20 MN D=8m D₁ = 1 m Ground Surface

A circular foundation of diameter 8 m supports a tank. The base of the foundation is at 1 m from the ground surface. The vertical load is 20 MN. The tank foundation was designed for short-term loading conditions (su = 80 kPa and Ysat = 19 kN/m³). The groundwater level when the tank was initially designed was at 4 m below the ground surface. It was assumed that the groundwater level was stable. However, Fourteen months after the tank was constructed and during a week of intense rainfall, the groundwater table reached the base of the circular footing and the tank foundation failed. It was speculated that failure occurred by bearing capacity failure. As a result of your calculations, establish and show whether this is correct or not. The friction angle is $'p = 25° from simple shear tests. 20 MN D=8m D₁ = 1 m Ground Surface

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 circular foundation of diameter 8 m supports a tank. The base of the
foundation is at 1 m from the ground surface. The vertical load is 20 MN. The tank foundation
was designed for short-term loading conditions (su = 80 kPa and Ysat = 19 kN/m³). The
groundwater level when the tank was initially designed was at 4 m below the ground surface. It
was assumed that the groundwater level was stable. However, Fourteen months after the tank
was constructed and during a week of intense rainfall, the groundwater table reached the base
of the circular footing and the tank foundation failed. It was speculated that failure occurred by
bearing capacity failure. As a result of your calculations, establish and show whether this is
correct or not. The friction angle is $'p = 25° from simple shear tests.
20 MN
D=8m
D₁ = 1 m
Ground Surface

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