基于内外应力场理论的主应力偏转对断层稳定性的影响分析  

Influence analysis of principal stress deflection on fault stability based on theory of internal and external stress fields

作　　者：董双勇 李文洲[1,2,3] DONG Shuangyong;LI Wenzhou(China Coal Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工开采研究院有限公司,北京100013 [3]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤矿安全》2021年第1期213-219,共7页Safety in Coal Mines

基　　金：天地科技股份有限公司科技创新创业资金专项资助项目(2018-TD-MS027)。

摘　　要：为探讨主应力偏转对断层稳定性的影响,基于内应力场理论阐释主应力偏转机理,建立计算内外应力场范围的力学结构模型,利用FLAC3D计算工作面自下盘靠近断层过程中主应力偏转情况,并分析断层损伤变量及其增速。研究表明,随着工作面不断推进,采动诱发主应力在内外应力场范围发生2次方向相反的偏转;工作面自下盘靠近断层时,主应力发生偏转产生平行于断层面的剪应力,使断层活化失稳危险性更高;应力偏转与损伤变量在工作面靠近断层过程中高度对应,表明断层稳定性与主应力偏转密切相关。内外应力场理论解释了工作面向断层推进过程中主应力偏转现象。To explore principal stress deflection effect on the stability of fault, based on the theory of internal stress field, the reason of principal stress deflection is explained, the mechanical structure model is established to calculate the internal and external stress fields, FLAC3D is used to calculate the deflection of stress principal axis when the working face is close to the fault from footwall, and to analyze the fault damage variable and its growth rate. Studies have shown that as the work continues to advance toward the fault, the principal stress induced by mining deflects twice in opposite directions in the internal and external stress fields;when the working face is close to the fault, the principal stress deflects to produce the shear stress parallel to the fault plane, which makes the risk of fault reactivation and instability higher. The theory of internal and external stress fields explains the deflection of the principal stress in the process of the working face advancing to the fault.

关 键 词：内外应力场 应力偏转 数值模拟 损伤变量 断层活化 

分 类 号：TD323[矿业工程—矿井建设]