Definition of Shear strength of soil

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Shear strength is a term used in soil mechanics to describe the magnitude of the shear stress that a soil can sustain. The shear resistance of soil is a result of friction and interlocking of particles, and possibly cementation or bonding at particle contacts. Shear strength is a very important property of soils. ... The shear strength of a soil can be regarded as its intrinsic capacity to resist failure when forces act on the soil mass. The strength is a function of the type as well as the physico-chemical make-up of the soil. Perhaps the most widely used device to measure soil strength in the field is the cone penetrometer.

 Shear Strength

 Take that value and multiply it by 60% (0.60). It is important to understand that this value is only an estimate. Unlike tensile and yield strengths, there are no published shear strength values or requirements for ASTM specifications.
 The equation for shear strength is , S = C + σ tanφ • Examples : clayey sand, silty sand, sandy clay. 9. 5. Tests for shear strength  The following tests are used to measure the shear strength of a soil. Undrained shear strength of a soil at the liquid limit can be considered to be around 1.7 kN/m-sq. Mechanical and chemical processes and/or reinforcing materials are used in order to increase soil shear strength. Necessity for reinforcing and strengthening of soil in geotechnical and civil engineering projects requires use of new materials and reinforces. The factors that affect the shear strength of the soil are conditions of drainage, stress, rate of strain, the density of the particles and the strain's direction.

 Shear stress which acts parallel to the surface of the soil mass and tends to slide or slip that soil mass from rest of the soil mass. When this shear stress exceeds the shear strength of a soil then it is called the shear failure for that soil element. From Wikipedia, the free encyclopedia. Cohesion is the component of shear strength of a rock or soil that is independent of interparticle friction. In soils, true cohesion is caused by following: Electrostatic forces in stiff overconsolidated clays (which may be lost through weathering).

 The peak strength is the maximum value of the shear stress or the maximum value of the ratio of shear stress to effective mean or normal stress. ... Peak strengths can only occur at shear stresses above the critical state line and at water contents below the CSL.

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