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一、前言我国西南部的北西向红河断裂带和鲜水河断裂带、南北向安宁河断裂带、北东向龙门山断裂带地震活动频繁。两条互相平行的北西向红河断裂带和鲜水河断裂带,大震时一个右旋而另一个却左旋水平错动,则又不失其特殊性。这四条断裂带皆处于我国大震多发区,对大震活动研究有较好的验证作用。古构造残余应力场,是古构造应力场残留至今的残余应力;其性质为岩体中微观残留自平衡应力;形成机制是由岩体强塑性变形固结所造成,只要岩石结构不变便在岩体中长期保存。在岩石新裂面表层中,平行新裂面的残余应力保留,垂直新裂面的在一定深度内
I. INTRODUCTION The NW-trending Honghe fault zone and the Xianshuihe fault zone, the Anninghe fault zone in the north-south direction, and the NE-trending Longmenshan fault zone in the southwest of China are subject to frequent earthquakes. There are two peculiar NW-trending Honghe fault and Xianshuihe fault zone parallel to each other. These four fault zones are all in the frequent occurrence areas of great earthquakes in our country, and have a good verifying effect on the research of earthquake activities. Paleo-tectonic remnant stress field is the residual stress to the paleo-tectonic stress field so far. The nature of the residual stress is micro-residual self-balance stress in the rock mass. The formation mechanism is caused by the strong plastic deformation and consolidation of the rock mass. Long-term preservation of rock mass. In the surface of the new rock crack surface, the residual stress of the parallel new crack surface remains, and the vertical new crack surface is within a certain depth