Numerical simulation of cumulative damage and seismic energy release during brittle rock failure - Part I: Fundamentals
Numerical simulation of cumulative damage and seismic energy release during brittle rock failure - Part I: Fundamentals
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DOI：
10.1016/s0148-9062(97)00009-0
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发表时间：
1998-02-01
影响因子：
7.2
通讯作者：
Kaiser, PK
中科院分区：
文献类型：
--
作者：
Tang, CA;Kaiser, PK
本文提出了一种数值模拟脆性岩石失稳破坏过程中引起地震能量释放的损伤萌生和扩展的方法。利用新开发的数值代码RFPA（2D）（岩石破坏过程分析），对导致剪切带或断层带发展的渐进破坏过程以及非均质岩石样本的最终倒塌进行了建模。由于模型中每个单元的本构关系都是弹脆性的，地震脆性的，因此每当单元失效时，地震能量就会被辐射。假设辐射能量等于元件在故障触发前存储的能量。由于岩石性质的不均匀性，地震平静可能偶尔出现在成核区内。基于模拟得到的地震事件率计算得到的累积地震损伤可以作为描述损伤演化的损伤参数。有人发现，辐射地震能量的显着减少，然后突然增加，可能是一个潜在的不稳定成核的指标。(C)1998年出版社：Elsevier Science Ltd
This paper presents a numerical approach for the simulation of damage initiation and propagation causing seismic energy release during unstable failure of brittle rock. With a newly developed numerical code, RFPA(2D) (Rock Failure Process Analysis), the progressive failure process leading to the development of a shear or fault zone, and the eventual collapse of a heterogeneous rock sample is modeled. Since the constitutive law for each element in the model is elastic-brittle, seismic-brittle, seismic energy is radiated whenever an element fails. It is assumed that the radiated energy is equal to the energy stored in the element before failure is triggered. Due to the heterogeneity of rock properties, seismic quiescence may occasionally occur within the nucleation zone. The cumulative seismic damage calculated based on the seismic event rate from the simulation can be used as a damage parameter to describe the damage evolution. It was found that significant decreases followed by sudden increases in radiated seismic energy may be an indicator of potentially unstable nucleation. (C) 1998. Published by Elsevier Science Ltd.