A Numerical Test on Influence of Mesoscopic Heterogeneity on Macroscopic Behavior of Rock Failure and Seismic Sequence types
A Numerical Test on Influence of Mesoscopic Heterogeneity on Macroscopic Behavior of Rock Failure and Seismic Sequence types
复制标题
细观非均质性对岩石破坏宏观行为及地震层序类型影响的数值试验
DOI：
10.1002/cjg2.414
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Wankai Hou
中科院分区：
文献类型：
--
作者：
M. Jiao;M. Jiao;Chun’an Tang;Guo;Yaolin Shi;Wankai Hou
应用一种新发展的岩石破裂过程数值分析方法RFPA 2D，研究了细观非均质性对岩石破裂宏观行为和地震序列类型的影响。通过数值计算，模拟了5种不同非均质性岩石试样的破坏过程。结果表明，不同非均质性的岩石破坏可产生不同的地震序列类型，主要有（1）主震-余震型、（2）前震-主震-余震型和（3）震群型。此外，对不同非均匀性岩石破坏的数值模拟表明，非均匀性对岩石变形、破裂形态和破坏模式的非线性行为有明显的影响。 随着均质度系数的提高，主破裂呈现脆断模式.同时，研究还发现，试件的破坏模式对具有相同力学性能的试件（包括非均匀性）的局部力学性能变化较为敏感。
A newly-developed numerical method, RFPA 2D , used for analysis of rock failure process, is applied to study the influence of mesoscopic heterogeneity on macroscopic behavior of rock failure and seismic sequence types. The failure processes of rock samples with 5 different kinds of heterogeneity are simulated by numerical calculations. The results show that rock failure with different heterogeneities can produce different seismic sequence types, mainly including (1) main shock-aftershock type, (2) foreshock-main shock-aftershock type, and (3)swarm type. Besides, the numerical simulation of rock failure with different heterogeneities shows that the non-linear behavior of rock deformation and fracture pattern as well as failure mode are obviously affected by the heterogeneities. With increasing the degree of rock homogeneity, the macroscopic failure process presents brittle behavior markedly. Meanwhile, it is also found that the failure modes of specimens are sensitive to the local variations of the mechanical properties of specimens with the same mechanical properties including the heterogeneity.