摘要
针对与断层平行的回采巷道围岩破碎且受构造应力作用,呈现非对称变形破坏,巷道维护较困难的特点,采用FLAC数值计算方法,建立了包含断层的计算模型,对其稳定机理进行了研究,分析了围岩的应力状态的变化及分布形态,得出了断层附近破碎围岩煤巷锚杆支护围岩稳定机理:1)锚杆支护能减小围岩应力降低速度,可改善两帮及顶底板的应力状态,提高破碎围岩残余强度,促进围岩稳定.2)锚杆支护可提高顶板抗剪能力,从而减小断层附近巷道发生冒落失稳的可能性.3)断层附近巷道围岩应力状态、变形破坏程度具有非对称性,对近断层煤帮加强支护有利于围岩稳定.
Because of crushed surrounding rock and being affected by tectonic stress in mining roadway paralleling to fault,the roadway presents an asymmetrical deformation character and so is difficult to support.Therefore,its stabilization mechanism is studied.Using the FLAC numerical method,we establish a calculation model including a fault and analyze stress variety and distribution conformation of surrounding rock.The stabilization mechanism of coal roadway with bolt support near fault is that,1）bolt support can reduce the speed of surrounding rock stress and improve stress state of roof and coal sides;consequently,it can enhance residual strength of crushed surrounding rock greatly and promote its stability;2）bolt support can enhance shear-resistant capability of roof so that it can reduce the possibility of roof caving near fault;and 3） the stress state,the extent of deformation and the failure of surrounding rock have the property of non-symmetry,so,for the support of coal side near fault,to strengthen supporting is favorable for stability of surrounding rocks.
出处
《采矿与安全工程学报》
EI
北大核心
2010年第4期482-486,共5页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(50774077)
煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM08X04)
全国博士学位论文作者专项资金项目(200760)
教育部新世纪优秀人才支持计划项目(NCET-06-0475)
关键词
断层
破碎围岩
锚杆支护
稳定机理
fault
crushed surrounding rock
bolt support
stability mechanism
