A sandy soil has a drained angle  of friction of 32 degrees. The deviation stress  at failure is 400 kPa.  Compute the angle that the failure plane  makes with the major principal plane. Compute the chamber confining  pressure in kPa.  Compute the shear stress in kPa at the  point of the failure plane.

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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.