8.Which one of the following statements is CORRECT?
(A) Strength of a rock decreases with increase in confining pressure.
(B) Strength of a rock increases with increase in temperature.
(C) Strength of a rock increases with increase in strain rate.
(D) Strength of a rock increases with increase in pore water pressure
Answer: C
1.Effect of increasing confining pressure:
-Rocks changes from brittle to ductile behavior. Ductile response dominant beyond 700 kg/cm^2
--Strength of the rock increases with increasing confining pressure.
2. Effect of increasing temperature:
-Strength decreases with increasing temperature.
--Ductile response occurs at lower pressure (stress) under higher temperature.
3. Effect of time:
-Stress applied in geologic systems occurs over millions of years.
--Rock strength decreases with decreasing strain rate.
References:
https://www3.nd.edu/~cneal/PlanetEarth/Chapt-11a-Rock-Mechanics.pdf
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