断层构造赋存条件下采动应力场分布特征研究  

Study on mining induced stress distribution under faults structure

作　　者：王宏伟[1,2] 姜耀东[1,2] 杨田[1] 张登强[1] 甯桃红 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤炭工程》2016年第1期92-94,98,共4页Coal Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB226801);国家自然科学基金资助项目(41502184);中国矿业大学(北京)大学生创新训练项目(201411413054;SKLCRSM14CXJH08)

摘　　要：采用相似模拟的手段研究了两条断层赋存条件下工作面采动应力场的分布特征。研究表明:由于长期的地质演变过程使得岩层内积聚了大量的变形能,工作面的采动使得上覆岩层的压力大部分作用于工作面回采遇到的第一条断层之上,在断层出现滑移之前,工作面采动导致第一条断层附近应力增加幅度远大于第二条断层。在断层出现滑移之后,第一条断层在工作面动压影响下首先滑移失稳,释放了大部分积聚于上覆岩层中的变形能,在此影响下第一条断层附近应力变化的幅度较大,第二条断层应力变化幅度相对较小。从能量非稳定态释放的角度分析,多断层赋存条件下,工作面回采遇到第一条揭露的断层诱发动力灾害的危险性更高,将对工作面和采场巷道稳定性带来诸多不利影响。The occurrence of the mine geological hazards is directly determined by the characteristics of fault structures and other geological conditions which are also the main factors for dynamic disasters and accidents in coal mine. We studied the distribution characteristics of stress field in the coal mining under two fault coupling using similar simulation. The simulation results indicated that, the mining-induced stress increase of the first fault was much significant than the second before the fault slip, as the advancement of the mining face made most of overburden pressure on the first fault while the stress and strain energy was accumulated in the overlying rock. After fault slip, the first fault slips destabilized firstly under the dynamic pressure due to the advancement of the mining face, therefore, most of the accumulated strain energy releases and stress variation in the first fault was relatively greater than that in the second. Based on the above results, it can be seen with the respect of unstable release of stain energy that, the dynamic disaster could be induced in high probability during the mining face passing through the first fault under the multi-faults coupling effect.

关 键 词：断层 动力灾害 变形能 应力分布 相似模拟 

分 类 号：TD324[矿业工程—矿井建设]