岩石断层失稳滑动能量释放特征分析

Study of Energy Release Characteristics of Rock Fault Instability Sliding

基于双向摩擦法实验,对岩石断层失稳滑动能量释放特征进行研究。研究结果表明:在断层临近失稳滑动时,断层两盘相对滑动位移增量呈现逐渐减小的趋势;断层失稳滑动过程中的应变能密度迅速降低,应变能密度的降低量与围压有关,随着围压的增加,应变能密度降低的量值也增大。断层不同区域的应变能密度释放量值不同,且断层失稳滑动时某些区域能量释放具有一定滞后性。

Based on the method of bidirectional friction experiment,study the sliding energy release characteristics of rock fault instability. The research results show that when the fault is near unstable sliding ,the relative sliding displacement increment of the two fault shows a decreasing trend;the strain energy density decreases rapidly during the sliding process of fault instability,the decrease of strain energy density is related to confining pressure,with the increase of confining pressure, the amount of strain energy density decreases also increases. Strain energy density release values is different in different fault zones, and the energy release of some regions in fault instabilitv sliding has hvsteresis.