利用损伤力学模型研究地震前兆现象  

Use damage rheology model research on the precursor of earthquakes′

作　　者：余怀忠[1] 尹祥础[1] 梁乃刚[1] 

机构地区：[1]中国科学院力学研究所非线性力学国家重点实验室,北京100080

出　　处：《地球物理学进展》2004年第2期404-413,共10页Progress in Geophysics

基　　金：国家自然科学基金(10232050);国家973项目(2002CB412706);中国科学院计算网络中心(INF105-SCE-2-02)项目资助.

摘　　要：　在地震等灾变破坏发生之前会出现一定的前兆现象,本文通过损伤力学模型,运用数值计算的方法对此进行了研究.从计算结果可以看到,在灾变破坏发生之前,由损伤所释放的能量(能量释放)和加卸载响应比值Y都发生了异常明显的变化,这表明二者具有相同的物理机制,在一定程度上都能够较为定量地刻画出系统的损伤演化过程.如果把二者相结合则可能对地震等灾变破坏做出更为准确的预测,本文结合实际震例对此也进行了一定的研究.Catastrophes such as earthquakes can be sorted as a kind of critical phenomena. Before these critical phenomena occur some precursors may appear. In this paper, damage rheology model is used and the numerical calculation is integrated with then earthquake cases research to study these precursors. From the results it can be seen that before the failure of system, two important precursors-the Energy Release and the Load/Unload Response Ratio-both change evidently. The results indicate that these two parameters are base on the same physical mechanism. They can quantitatively manifest the damage evolution of a system to a certain extent. It may be feasible to predict the occurrence of some catastrophes such as earthquakes quantitatively by integrating these two parameters.

关 键 词：损伤力学模型 临界点理论 能量加速释放 加卸载响应比 

分 类 号：TU45[建筑科学—岩土工程] P315[建筑科学—土工工程]