1Medium15 marks
Laboratory results of a soil have shown that its unconfined compressive strength is 120 kN/m^2. In a triaxial compression test, a specimen of the soil when subjected to a confining pressure of 40 kN/m^2 failed at an additional stress of 160 kN/m^2. Estimate the shearing strength of the same soil along a horizontal plane at a depth of 4 m at the site. The groundwater table is at a depth of 2.5 m from the ground level. Take the dry unit weight of the soil as 17 kN/m^3 and specific gravity as 2.7. Also, assume the unit weight of water as 10 kN/m^3.