A 4-m diameter circular footing is supporting a water tank. The total weight of the footing, tank and its contents is 1.60 MN. Using the Bousinessq equation: ?? = ? × ?? where ?? = 1 − 1/? and ? = [(?/?) 2 + 1] 3/2 , determine: a. The pressure at the base of the footing b. The increase in pressure at a depth of 4 meters below the base of the footing c. The depth below the base of the footing where pressure increase is equal to 1/6 pressure at the base of the footing

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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.