Does Confining Stress Increase Volume?

The instantaneous strain response had a volumetric dilation and was attributed to the loading of the pore pressure. According to the effective stress concept, an increase in the pore pressure can cause a decrease in the effective confining stress and result in volumetric dilation.

What is the effect of confining stress?

It is found that the crack initiation forces significantly increase as the confining stress increases, while the maximum angle of cracks decreases as the confining stress increases. The numerical results obtained from the proposed method agree well with those in previous indentation tests.

What is confining stress in geology?

In geology, stress is the force per unit area that is placed on a rock. ... A deeply buried rock is pushed down by the weight of all the material above it. Since the rock cannot move, it cannot deform. This is called confining stress.