摘要
基于数值模拟手段,综合考虑矿压和水压的联合影响作用,通过模拟采煤时底板岩层应力分布状态及其变形破坏过程,深入对比研究煤层开采过程中断层对底板岩层应力重新分布及其变形破坏规律、直至突水的影响。研究表明:当采空区煤壁附近有断层存在时,工作面前(后)方底板岩层应力分布呈明显的不均一性,应力变化比完整底板更剧烈,煤壁附近应力集中现象更明显,急剧的应力变化更易导致底板发生变形、破坏,断层及其附近次级结构面的存在同时也加剧了采煤过程中底板及围岩裂纹、裂隙的扩展,断层距工作面越近,越易发生突水。
In this paper, deep research was made on the influence of faults upon the stress redistribution, deformation failure law and water inrush of the floor rock stratum in the mining process of coal seams by means of numerical simulation and according to the combined action of mine ground pressure and groundwater pressure and through the simulation of the stress distribution state and deformation failure course of floor rock stratum in coal mining. Research results indicated that when fault existed near the coal wall of the gob, the stress distribution of the floor rock stratum in front of and behind the working face assumed remarkable heterogeneity, its stress variation was much more severe than that of the intact rock stratum, the stress was mainly concentrated near the coal wall, the severe stress variation caused the deformation and failure of the floor rock stratum much easily, the existence of fault and the secondary structural pane near it also aggravated the expansion of floor and surrounding rock fissures in coal mining process, the shorter distance from fault to the working face, the easier the occurrence of water inrush.
出处
《矿业安全与环保》
北大核心
2013年第5期29-33,共5页
Mining Safety & Environmental Protection
关键词
断层
数值模拟
底板突水
变形破坏
应力集中
fault
numerical simulation
floor water inrush
deformation failure
stress concentration
