采动影响下逆断层活化规律的数值模拟  

Numerical simulation on mechanism of thrust fault reactivation during mining

作　　者：闵飞虎[1,2] 向必伟 刘辉[1,2] 朱晓峻 MIN Feihu;XIANG Biwei;LIU Hui;ZHU Xiaojun(School of Resources and Environmental Engineering,Anhui University,Hefei 230601,China;Anhui Province Engineering Laboratory of Mine Ecological Remediation,Hefei 230601,China)

机构地区：[1]安徽大学资源与环境工程学院,安徽合肥230601 [2]安徽省矿山生态修复工程实验室,安徽合肥230601

出　　处：《煤田地质与勘探》2019年第4期144-152,共9页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41472194);安徽省高校自然科学研究重点项目(KJ2018A0003)~~

摘　　要：煤矿开采过程中断层活化时有发生,是矿井灾害防治研究的热点问题。为了揭示不同断层倾角条件下煤层开采对断层活化的影响,以淮南新集二矿地质采矿条件为例,采用FLAC3D进行数值模拟,系统研究逆断层下煤层开采过程中断层的动态活化规律,阐明了断层活化位置与工作面推进距离、断层倾角之间的关系。研究表明,断层活化可分为累积期、形成期、破坏期3个发育阶段;当工作面回采至工作面推进距离的一半时,断层开始活化,至开采结束,断层滑移量最大;倾角越小的断层面越早开始活化,倾角越大的断层面滑移量越大。研究成果为断层发育区煤炭资源安全开采提供了理论依据和技术参考。It is a hot issue in mine disaster research about the activation of faults during the process of coal mining and excavation.In order to reveal the influence of coal mining on fault activation under different fault dip conditions,Xinji No.2 mine in Huainan coalfield was taken as an example,and numerical simulation with FLAC^3D was used to systematically study the dynamic activation law of thrust faults during mining beside the faults,and to clarify the relationship among fault activation position and fault dip angle and excavated distance of working face.The results show that the fault activation is divided into three stages: Accumulation period,formation period and dynamic development period.As the working surface advances,the fault begins to activate when it is pushed to half the length of the working face,and the fault slip is the largest at the end of mining.As the fault dip angle increases,the smaller the dip angle,the earlier the fault layer begins to activate.The larger the dip angle,the larger the slip surface will be.It provides a theoretical basis and technical reference for the safe exploitation of coal resources in fault development areas.

关 键 词：断层活化 逆断层 煤矿开采 数值模拟 矿井灾害 新集二矿 

分 类 号：P542[天文地球—构造地质学]