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本文在Asperity模式和Barrier模式的基础上,提出了另外一种不均匀体模式——障碍体模式,并对该模式进行了数值模拟的研究。结果除证实了我们以前做过的单轴压力下模拟障碍体的实验结果以外,还表明在含有障碍体的断层面上,破裂的扩展与破裂的传播速度、始破裂区域的大小、裂纹的类型以及障碍体所在断层的介质有关。在有围压的情况下,破裂可以先越过或绕过强度较高或尺度较大的障碍体,经一段时间的应力积累过程后,再使障碍体发生破坏。本文通过对震源区中障碍体的性质和影响的研究,解释了海城和邢台两个地震序列形成和发展的可能原因,得到一些较为合理的结果。
Based on the Asperity and Barrier modes, this paper proposes another inhomogeneous mode-obstacle mode, and studies the model numerically. In addition to confirming the experimental results of a simulated obstacle under uniaxial compression that we have done before, the results also show that the propagation of rupture and rupture, the size of rupture zone, the type of crack As well as the fault body where the fault-related media. In the case of confining pressure, the rupture may first pass or bypass the higher-intensity or larger-scale obstacle body, and after a period of stress accumulation process, the obstacle body may then be damaged. Based on the study of the nature and influence of the obstacles in the source area, this paper explains the possible reasons for the formation and development of the two earthquake sequences in Haicheng and Xingtai, and obtains some reasonable results.