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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Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.