关键词: 断层位移速率, 数值模拟, 临界刚度, 滑动稳定性

Abstract: This work elucidates the stability boundary for small perturbation and dynamic motion of an inclined spring slider fault system in which normal stress is coupled to shear stress on the sliding surface. With rate and state dependent friction,our anlysis shows that critical stiffness on the stability boundary decreases with increase of sliding rate. This means that a positive jump of the load point velocity may lead to a transition from cyclic stick slip motion to stable sliding; and a decrease of the load point velocity may lead to a transition from stable sliding to cyclic stick slip motion. Positive velocity jump greater than a certain amount may also trigger a single instability,but no transition between cyclic stick slip and stable sliding modes occurs in this situation. Experimental evidences of triaxial friction tests from references and our own experimental study support these theoretical results.

Key words: Fault displacement rate, Numerical simulation, Critical stiffness, Sliding stability