Abstract
Two types of constitutive equations can be used to simulate the time dependent behaviour of rocks. One of these is proposed supposing that the plastic strain increases, and another that the compliance increases. By either type of constitutive equations, time dependent behaviour where strain is monotonicaly increased or decreased can be well simulated. However, if load is once increased and then decreased, the calculated results are different between the two. In this paper, the time dependent behaviour such as loading rate dependency of strength is summarized and the fundamental requirements for a constitutive equation of rocks are given. Then, both types of constitutive equations are critically discussed.
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