采矿与安全工程学报2017，Vol.34Issue(3)：411-417,7.DOI:10.13545/j.cnki.jmse.2017.03.002
临近断层孤岛面开采动力显现机理与震动波CT动态预警
Dynamic manifestation mechanism of mining on the island coalface along fault and dynamic pre-warning of seismic waves with seismic tomography
摘要
Abstract
To study the pressure status of fault pillar and the dynamic manifestation mechanism of mining on the island coalface along fault,the structure and movement law of overlying strata above working face 7192 was analyzed theoretically,the mechanism of dynamic manifestation and strong mining tremor in the working face caused by fault dislocation was studied,and the dynamic pre-warning of rockburst hazard was also conducted with the technology of seismic tomography.The results have shown that 1) The overlying strata of working face in dip direction transforms from a symmetrical "T" structure subjected to the coal mass of working face to an asymmetric "T" structure subjected to the fault pillar,and an asymmetric "T" structure is found in strike direction due to long hanging distance of middle and high key strata caused by short working face length;2) The strong mining tremors occurring near the fault are influenced by the interval of fault movement suspension:the released energy of latter mining tremor will be higher with the increasing time interval;3) The strong mining tremors at the working face are mainly caused by the sudden rupture and movement of medium and high key strata,and the fault pillar failure results in sudden fault movements,which causes a dynamic loading combined with high stress loading in coal mass and triggers the dynamic manifestation;4) The evolution process of stress redistributions in the working face area is revealed by the technology of seismic tomography dynamic pre-warning,and both areas of dynamic manifestation and strong mining tremors are consistent well with the tomography results,which proves the pre-waming reliability of seismic tomography.关键词
动力显现/冲击矿压/覆岩运动/震动波CTKey words
dynamic manifestation/rockburst hazard/overlying strata movement/seismic tomography分类
矿业与冶金引用本文复制引用
曹安业,王常彬,窦林名,李跃文,董敬源,谷雨..临近断层孤岛面开采动力显现机理与震动波CT动态预警[J].采矿与安全工程学报,2017,34(3):411-417,7.基金项目
国家自然科学基金项目(51674253) （51674253）
国家重点研发计划项目(2016YFC0801406) （2016YFC0801406）
江苏高校优势学科建设工程项目(SZBF2011-6-B35) （SZBF2011-6-B35）
