断层力学参数反演及其对地应力场扰动效应研究  

Mechanical Parameters Back Analysis for Faults and Study on Fault's Disturbance Effect to In-situ Stress Field

作　　者：李永松[1,2] 陈建平[1] 尹健民[2] 许静[2] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水力发电》2014年第2期45-47,75,共4页Water Power

基　　金：国家重点基础研究发展计划"973"项目(2011CB710603);水利部公益性行业科研专项项目(201001009);中央级公益性科研院所基本科研业务费项目(CKSF2011020/YT)

摘　　要：鉴于断层的力学参数的难以确定性,将断层简化为均质连续体,基于现场地应力实测资料,结合正交设计理论及人工神经网络的非线性反演方法对断层的力学参数进行反演,并对断层对应力场的扰动效应进行研究。研究结果表明,断层内部及附近区域有明显的应力分异现象,这种应力分异现象与断层的几何构造有关;在断层内及其附近区域最大水平主应力方位与断层走向基本平行,而断层尖灭处最大水平主应力方位与断层走向呈大角度相交。Because it＇s so difficult to determine the mechanical parameters, the faults are simplified as homogeneous and continuous body, and the mechanical parameters of fault are back analyzed with nonlinear inversion method of orthogonal design theory and artificial neural network inversion based on measured results of in-situ stress. Meanwhile, the fault＇s disturbance effect to in-situ stress field is also studied. The results show that there is an obvious in-situ stress differentiation phenomenon inside and near fault related to fault＇s geometric construction, the maximum horizontal principal stress orientation inside and near fault is basically parallel to fault strike, but the maximum horizontal principal stress orientation intersects fault strike at a high angle at thinning out of fault.

关 键 词：断层 地应力 扰动效应 参数反演 

分 类 号：TU452[建筑科学—岩土工程]