中国大陆现今构造应力场的回归分析研究

A study of regression analysis and numerical simulation on modern tec-stress field in China mainland

叙述了应用有限元方法和回归分析理论,依据实际应力观测资料,结合中国大陆构造地质资料反演中国大陆现今构造应力场的研究成果。计算中考虑了地壳结构在纵向上和横向上的非均匀性和现今活动断层的影响,采用接触分析方法模拟了板块边界的作用。计算结果表明,通过回归分析得到中国大陆现今构造应力场特征与实际观测结果是一致的:(1) 在中国大陆现今水平最大主压应力轴走向以青藏高原为中心,呈辐射状分布;(2) 在中国大陆现今水平最大主压应力总体表现为由西向东逐渐降低的趋势;(3) 中国大陆东南的台湾海峡区域水平最大主压应力有局部升高的现象。

In this present paper, the FEM simulation and regression analysis theory are adopted to conduct back calculations of research results of modern tec-stress field in China mainland, in the light of in-situ measured stress data and in combination with the geological information concerned. In calculation. the effects of longitudinal and transversal in homogeneity and modern active faults are taken into consideration, and the contact analyzing method is used to simulate the action of boundary plates. the results have shown that. (1) the strike of the horizontal major principal compression stress axis presents a radiational distribution with the Tibetan plateau as center; (2) this principal stress has a tendency as a whole of gradual reduction from the west towords the east; (3) the local increment phenomenon of the horizontal major compression stress is observed in the area around the Taiwan Straits in south-east China and the results of simulation on the boundary plate action using the contact analysis method is closer the in situ mearsure results analysis method.