摘要
以济三煤矿6303面地质条件为背景,进行了断层滑移失稳相似模拟试验及数值模拟.研究表明,工作面由断层下盘向断层推进,在采动影响下断层面正应力下降,剪应力上升,断层发生"活化",断层滑移量急剧增加,顶板稳定性变差,工作面支承压力升高;工作面过断层后,断层正应力增加,剪应力减小,顶板易于形成平衡结构,矿压显现不明显.工作面由断层上盘向断层推进,断层面正应力上升,断层不易于"活化",断层滑移量较小,顶板易于形成平衡结构;工作面过断层后,断层正应力迅速下降,断层滑移量增加,顶板稳定性差,工作面支承压力增加.通过对比分析,可以确定当工作面位于断层下盘时冲击矿压危险性远高于工作面位于上盘时的危险性.并通过对几个煤矿断层冲击矿压现象的分析从而验证了该结论的正确性.
The similar test and numerical simulation of fault slide destabilization were carried out according to the geological conditions of No.6303 working face in Jining No.3 coal mine.The results indicate that,when the working face advances from the fault footwall to the fault itself,the slip displacement sharply increases due to the decrease of normal stress and the increase of shear stress,making the fault be activated,the abutment pressure ahead of the working face obviously increase,and the stability of the roof decrease.After passing the fault,the roof is easy to form a balanced structure due to the increase of normal stress and the decrease of shear stress,and the strata behavior is not obvious.However,when the working face advances from the hanging wall to the fault itself,it is difficult for the fault to be activate due to the increase of normal stress,the slip displacement is low and the roof is easy to form a balanced structure.After passing the fault,the slip displacement increases due to the decrease of normal stress,the stability of the roof decreases and the abutment pressure ahead of the working face increases.To sum up,it can be made sure that the risk of rock burst when working face locating in the fault footwall is higher than that locating in the hanging wall.This conclusion can be validated by analyzing the phenomenon of fault rock burst in several coal mines.
出处
《采矿与安全工程学报》
EI
北大核心
2010年第4期499-504,共6页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2005CB221501)
国家自然科学基金项目(50474068)
国家"十一五"科技支撑计划项目(2006BAK03B06
2006BAK04B02)
关键词
断层
滑移失稳
相似模拟试验
断层滑移量
剪应力
fault
slide destabilization
similar test
fault slip displacement
shear stress