水库诱发地震机理研究

Research on the Mechanism of Rsevoir-induced Seismicity

以丹江口水库为对象,运用大型有限元软件通过数值分析方法,模拟库区初期工程和续建工程水压应力场,分析其特点和变化,探讨水库诱发地震机理,并对丹江口水库续建工程诱发地震进行评价。研究表明,库区蓄水后浅层诱发地震与库水载荷在库岸形成的主拉应力和拉应变有着直接关系;并且库水使主要断层产生相对滑移,但是否因此而诱发地震,尚与库区地质条件有着重要关系。续建工程水位提高后,丹库东侧为主要淹没区,该库有可能诱发新的地震,地震危险区为:黄庄、凤凰、厚坡、九重、彭桥、仓房。

Based on Danjiangkou reservoir,the hydraulic-pressure stress and strain fields are numerically simulated in its initial and sequent projects by applying for finite-element soft ANSYS.The mechanism of reservoir-induced seismicity is studied by analyzing their property.And the reservoir-induced seismicity in sudsequent project is evaluated.The results show that the seismicity induced in reservoir area is related to the principal tensile stress and strain due to water,and that water makes the main faultages in reservor area slide,but whether the slide will lead to seismicity has important correlation with geologic condition.In subsequent project,the east of Danjiang reservoir will mainly be submerged,and it is possible to induced seismicity here.The potential places for seismicity include Huangzhuang,Fehuang,Houpo,Jiuchong,Pengqiao,and Changfang.