摘要
为了研究急倾斜煤层冲击地压灾害致灾机理,通过理论分析与现场实测相结合的方法,建立力学模型研究近直立特厚煤层覆岩破断运移规律。研究结果表明:近直立煤层岩层破断主要集中在直接顶岩层,随工作面开采深度增加,顶板岩层首先出现离层,在重力作用下发生倾倒折断,靠近工作面顶板处的岩块多为倾倒运动,靠近工作面底板处的岩块多为向下滑移运动,采空区中部的岩块多表现为跌落和翻转运动。通过现场测试发现,岩层发生离层、破断受到工作面采动与顶底板的影响,直接顶岩层受工作面采动影响较大,运动较为剧烈,基本顶则较为稳定。通过进一步研究近直立煤层顶底板岩层的垮断情况,为近直立煤层综放开采条件下煤岩层破断运移致灾预报及灾害防控提供借鉴。
In order to study the law of rock burst disasters of steeply inclined extra-thick coal seams,we established a mechanical model to study the law of fracture and movement of the overburden on nearly vertical coal seams in terms of theoretical analyses and on-site observations and tests.The results show that the rock stratum fracture mainly occurs in the immediate roof during the nearly vertical coal seams mining.As the working face mining keeps approaching,the roof stratum first appear to be torn off,accordingly will be fractured and collapse under gravity.Rocks near the roof stratum of the working face are inclined to collapse,and that near the floor of the working face are mostly slid.Rocks from the middle of the goaf are mostly falling down and overturned.On-site observation indicates rock separation and fracture are due to working face mining and roof-floor effect.The immediate roof will move violently attributed to the face mining,while the main roof is more stable.We furthered the study on the collapse of the roof-floor rock layers in nearly vertical coal seams,and provided a reference for forecast and control of the disasters,which were caused by coal and rock fracture and movement during fully-mechanized top-coal caving mining.
作者
刘旭东
乔浩
方贤威
朱红伟
LIU Xudong;QIAO Hao;FANG Xianwei;ZHU Hongwei(CHN Energy Group Xinjiang Energy Co.,Ltd.,Urumqi 830084,China;College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2025年第1期113-119,共7页
Coal Engineering
关键词
近直立特厚煤层
岩层运移
岩层破断
相似模拟
钻孔窥视
nearly vertical and extra thick coal seam
rock formation movement
rock formation fracture
similar simulations
drill hole peeping
