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Mohr presented in 19 00 a theory of rupture of materials that was the result of a combination of both normal and shear stresses.

** ****The Mohr
Failure Criterion:**

Mohr
presented in 19 00 a theory of rupture of materials that was the result of a
combination of both normal and shear stresses. The shear stress at failure is
thus a function of normal stress and the Mohr circle is tangential to the
functional relationship given by Coulomb

**The Mohr-Coulomb F ailure Criterion:**

This theory states that: “a material fails
because of a critical combination of normal stress and
shear stress, and nott from their either maximum normal or shear stress
alone”

This
equation is known as the Mohr-Coulomb Failure Criterion.

**Laboratory
determination of shear parameters ****–**** Direct
shear test**

The shear
strength parameters for a particular soil can be determined by means of
laboratory tests on specimens taken from representative samples of the in-situ
soil. Great care and judgment are required in the sampling operation and in the
storage and handling of samples prior to testing, especially in the case of
undisturbed samples where the object is to preserve the in-situ structure and
water content of the soil. In the case of clays, test specimens may be obtained
from tube or block samples, the latter normally being subjected to the least
disturbance. Swelling of a clay specimen will occur due to the release of the
in-situ total stresses. Shear strength test procedure is detailed in BS 1377
(Parts 7 and 8) [7].

Tags : Civil - Soil Mechanics -Shear strength

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