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本文利用库仑-纳维(coulomb-Navier)强度理论作为地壳断层剪切破坏的判据,确定地震前震源区应力的极限状态。然后,应用断裂力学理论分析圆盘裂缝稳态扩展的条件。导出地震前稳态扩展微裂缝数目的积分表达式。以此为基础,讨论断层参数、应力场参数和岩石物理力学特性参数与膨张现象间的关系。得到的结果可用来解释某些地区震前没有膨胀现象和另一些地区震前出现强烈的膨胀现象。并且,对膨胀理论预报地震的适用范围和应用经验公式预报震级的条件,提出了一些看法。
In this paper, the coulomb-Navier strength theory is used as a criterion for the crustal fault shear failure to determine the ultimate stress state of the source region before the earthquake. Then, the fracture mechanics theory is applied to analyze the steady-state expansion of the disk crack. Derive the integral expression of the number of steady state extended microcracks before earthquakes. Based on this, the relationship between fault parameters, stress field parameters and petrophysical properties parameters and swelling phenomenon is discussed. The results obtained can be used to explain the fact that some areas did not swell before the earthquake and the other areas swelled strongly before the earthquake. In addition, some suggestions are put forward on the application of the expansion theory to forecast the earthquake magnitude and the application of empirical formula to predict the magnitude of the earthquake.