Description:

 

So far, we have studied stress states. The strain state is found in a similar manner to the stress state. With reference to Figure, the principal strains are

 

 

 

 

where gzx is called the engineering shear strain or simple shear strain.

 

The maximum simple shear strain is

 

 

 

 

Mohr’s circle of strain.

 

 

 

 

In soils, strains can be compressive or tensile. There is no absolute reference strain. For stresses, we can select atmospheric pressure as the reference, but not so for strains. Usually, we deal with changes or increments of strains resulting from stress changes.

THE ESSENTIAL POINTS ARE:

1. Mohr’s circle is used to find the stress state or strain state from a two-dimensional set of stresses or strains on a soil.

2. The pole on a Mohr’s circle identifi es a point through which any plane passing through it will intersect the Mohr’s circle at a point that represents the stresses on that plane

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