The soil profile shown consists of a layer of dry sand 4 m. thick which overlies a layer of clay having a thickness of 6 m. Ground water table is located at the interface of the sand and clay. Compute the effective stress at the bottom of the clay layer. Sand: G = 2.68; e = 0.40 Clay; G = 2.72; e =0.90 Dry Sand G-2.68 e-0.40 4m 6m Clay Ground water table A G=2.72 20,90

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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.