At a point on the free surface of a stressed body, a normal stress magnitude of Sy = 61 MPa (C) and an unknown positive shear stress exist on a horizontal plane. One principal stress at the point is 11 MPa (C). The absolute maximum shear stress at the point has a magnitude of 76 MPa. Determine the unknown stresses on the horizontal and vertical planes and the unknown principal stress at the point. Sxy Answers: i 0x = i Txy = op2 = i Sx MPa MPa MPa

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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.