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The shear strength of soil defines the maximum resistance of soil offered parallel to the plane of
application of force. The shear strength of the soil is given by:
τ= σ' tan(φ') + c' ------ (eq.1)
where, σ' = effective vertical stress on the soil
φ' = angle of internal friction
c' = cohesion of the soil
The strength parameter of the non-cohesive soil e.g sand doesnot have cohesion component in it. Non-
cohesive soils are also highly permeable and thus undrained behavior of it is not used.
However the strength parameter of the cohesive soils like clay is influenced by the presence of water
content in it. As the water takes time to escape from the soil, the soil characteristics at saturated state is
guided by undrained soil parameter. When with time the water from the clay is drained, the soil
characteristics are guided by drained soil parameter. Intermediate strength parameter may be observed
at intermediate water content.
It may be noted that the drained soil strength consists of both cohesion and friction but the undrained
parameter only has cohesion component.
The shear strength of the soil is used in various design application in geotechnical engineering. Following
are geotechnical designs where the shear strength of soil has a major play:
1. Slope Stability: following figure shows a typical problem of slope stability
When the soil is excavated or cut in a slope the sides of the slope tends collapse and hence slope
stability analysis is required. In slope stability problem there is unstable soil mass that tends to slide
under gravity (upper soil zone over surface of rupture). Thus the weight of soil is the destabilizing force
and the shear resistance from the soil acts as stabilizing force.
The cohesive soil with high insitu water content (ex. London clay) shows high value of cohesion as
eflected by...