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壳内岩石膨胀可能是形成某些大陆地震前兆的一个重要机制。为了揭示孕震体内岩石膨胀的作用,进行必要的膨胀模型的研究及相应的模拟计算是重要途径之一。在这方面,Nur 已做了开拓性工作。但是,为了更加适合地壳内部的情况,还应考虑某些因素的作用,如围压对膨胀的影响,起始膨胀的应力判别准则等。本文就是在考虑了上述因素的条件下,对Nur提出的膨胀本构关系做了一些必要的扩充。同时,为了模拟实际的孕震过程,将此模型编制成有限元程序,装在IBM-PC机上。最后,利用一个二维剖面模型,对地壳内不同深度产生膨胀的可能性及膨胀后地表垂直位移的变化进行了计算和讨论。
Rock expansion within the crust may be an important mechanism for the formation of precursors of some of the continents. In order to reveal the role of rock expansion in seismogenic body, the necessary expansion model and the corresponding simulation calculation are one of the important ways. Nur has pioneered this area. However, in order to be more suitable for the situation inside the crust, some factors such as the effect of confining pressure on expansion and the stress-onset criterion for initial expansion should be considered. In this paper, we have made some necessary extensions to the inflationary constitutive relations proposed by Nur, taking into account the above factors. At the same time, in order to simulate the actual seismogenic process, this model was compiled into a finite element program and installed on an IBM-PC. Finally, a two-dimensional cross-section model is used to calculate and discuss the possibility of expansion at different depths in the crust and the vertical displacement of the surface after the expansion.