摘要
采用相似模拟实验对采场小断层(落差小于5m)区域覆岩破断规律和断层构造裂隙的演化过程进行了研究,得出了采场小断层对导水裂隙高度的影响规律.工作面由下盘向上盘推进至正断层面附近时,下盘岩块回转导致煤壁前上方的断层面挤压闭合,煤壁后上方的断层面则处于张开状态;随工作面推进断层面经历张开—闭合—张开—闭合的过程,断层面导水裂隙高度比上、下盘竖向采动导水裂隙高度分别增大40%和61%.工作面由上盘向下盘过逆断层时,主要控制上盘岩层对支架的压力和推力;工作面进入下盘后顶板周期破断距变小,来压频繁;上盘主要表现为沿断层面的滑移;断层面导水裂隙高度与两盘岩层导水裂隙高度基本相等.
Overlying strata fracture law and evolutionary process of water conducted fissure in little fault （fault throw less-than 5 m） zone were researched by similar simulation experiment. The effect law of little fault in working face to water conducted fissure height was obtained. When working face advances near to normal fault from lower plate to upper plate, rotating deformation of lower plate strata induces fault surface in the ahead upward side of wall closing, and fault surface in the rear upward side of wall opening. Fault fissure experience the process of opening-closing-opening-closing along face advancing. Water conducted fissure height of normal fault face individual increase 40% and 61% than that of upper and lower plates. When working face through reversed fault from upper plate to lower plate, the pressure and pushing force of upper strata should be major controlled. Periodic fracture distance of roof strata becomes short after face enter lower plate, and roof weighting become frequent. Upper plate mainly presents slipping along fault surface. Water conducted fissure height of reversed fault is basic equal to that of upper and lower plates.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第10期1316-1321,共6页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)基金资助项目(2007CB209400)
国家自然科学基金资助项目(50774079)
关键词
采场
小断层
导水裂隙高度
相似模拟
working face
little fault
water conducted fissure height
similar simulation
