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根据北京西山压力影构造中核心矿物的三种原始位态。设计了三种二维弹塑性有限元模型。从而解决了压力影形成过程中的三个基本问题:a.核心矿物是否旋转;b.影中矿物就位的空间是如何形成的;c.影中矿物的物质来源。同时,根据北京西山压力影构造的同构造变形和生长特征,本文修正了Ramsay等(1983)的压力影“刚性纤维模型”。进而用图示法建立了不同应变状态下纤维束的几种可能模型。然后,本文建立了两大系列的利用同构造纤维状压力影进行有限应变和增量应变测量的计算公式,并将其编译成计算机程序。
According to Beijing Xishan pressure shadow structure of the three original core mineral state. Three two-dimensional elasto-plastic finite element models are designed. So as to solve the three basic problems in the process of pressure shadow formation: a. Whether the core minerals are rotating; b. How the space in the shadow minerals is formed; c. The source of the minerals in the shadow. At the same time, according to the synsetical deformation and growth characteristics of the Xishan pressure shadow structure in Beijing, this paper corrects the pressure shadow “rigid fiber model” of Ramsay et al. (1983). Furthermore, several possible models of fiber bundles under different strain states are established by the graphic method. Then, two series of formulas for calculating the finite strain and incremental strain using the same structure of fibrous pressure shadow were established and compiled into computer programs.