摘要
为揭示近直立煤层群水平分段综放开采条件下围岩应力分布与动态演化特征,以乌东煤矿南采区B1+2和B3+6工作面为工程背景,采用理论分析、数值模拟等方法,对同水平两工作面交替开采的应力分布与动态演化特征开展了研究。结果表明:随开采深度增加,整体上两工作面煤体支承压力峰值不断增大,峰值点不断下移;煤体应力集中峰值呈"锯齿状"波动增长,应力峰值点下移距离呈"阶梯状"增长,B3+6工作面优先开采对B1+2煤体起到卸压作用,降低了其应力集中峰值,B3+6煤体应力峰值始终大于B1+2煤体,应力峰值位置始终低于B1+2煤体应力峰值位置;函数拟合得出了应力集中峰值与应力峰值位置与2个工作面开采深度的线性相关关系式;提出了随开采深度增加冲击地压防治方案优化思路。
In order to reveal the stress distribution and dynamic evolution characteristics of the surrounding rock under the conditions of horizontal layered mining of steeply inclined coal seams,the stress distribution and dynamic evolution characteristics of the alternate mining of two working faces at the same level were studied by using theoretical analysis and numerical simulation with B1+2 and B3+6 working faces in the south mining area of Wudong Coal Mine as the engineering background.The results show that:with the increase of mining depth,the overall peak pressure of coal body support in the two working faces increases and the peak point keeps moving downwards;the peak stress concentration in the coal body shows a“serration”fluctuation growth and the downward distance of the peak stress point shows a“step”growth.The B3+6 coal body stress peak is always greater than that of B1+2 coal body,and the stress peak position is always lower than that of B1+2 coal body;the linear correlation between the stress concentration peak and stress peak position and the mining depth of the two working faces is obtained by function fitting;the idea of impact ground pressure prevention and control scheme is proposed with the increase of mining depth.
作者
刘传义
杨胜利
冯攀飞
刘垚
李明
许金梦
毕健成
LIU Chuanyi;YANG Shengli;FENG Panfei;LIU Yao;LI Ming;XU Jinmeng;BI Jiancheng(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Energy Group Xinjiang Energy Co.,Ltd.,Urumqi 830084,China)
出处
《煤矿安全》
CAS
北大核心
2022年第1期205-211,共7页
Safety in Coal Mines
关键词
近直立煤层群
冲击地压
水平分段开采
开采深度
应力演化
steeply inclined coal seams
rock burst
horizontal layered mining
mining depth
stress evolution
