摘要
为解决迎采对掘巷道矿压显现强烈、形变量大的问题,文章以新元矿9111工作面回风巷的地质资料为背景,运用理论分析、数值模拟、现场实测等方法,分析了切顶卸压工艺实施前后对迎采动压巷道围岩应力场的影响,得出结论如下:受工作面超前支承压力影响,9111回风采帮的垂直应力大于煤柱帮,峰值应力出现在滞后回采工作面15 m的位置;切顶卸压工艺能有效减少关键层的悬顶距,煤柱帮、采帮侧的应力增量较切顶前分别降低了22.9%、13.3%;切顶卸压工艺实施后巷道围岩变形整体可控,观测周期内顶底板及两帮移近量分别为278.6 mm、231.8 mm.
To address the issue of strong mine pressure manifestation and large deformation in the mining face approach tunnel,this paper based on the geological data of the 9111 working face return airway in Xinyuan Coal Mine,uses theoretical analysis,numerical simulation,and field measurement methods to analyze the influence of the roof caving pressure relief technology on the stress field of the surrounding rock of the mining face dynamic pressure tunnel before and after its implementation.The following conclusions are drawn:affected by the advanced support pressure of the working face,the vertical stress of the return airway's coal pillar side is greater than that of the mining side,and the peak stress occurs at a position 15 m behind the mining face.The roof caving pressure relief technology can effectively reduce the overhang distance of the key strata,and the stress increments on the coal pillar side and the mining side of the tunnel are reduced by 22.9%and 13.3%respectively compared to before the roof caving.After the implementation of the roof caving pressure relief technology,the deformation of the surrounding rock of the tunnel is generally controllable.During the observation period,the convergence of the roof and floor and the two sides are 278.6 mm and 231.8 mm respectively.
作者
李志刚
刘冲
孙英杰
李海龙
LI Zhigang;LIU Chong;SUN Yingjie;LI Hailong(Shanxi Lu'an Chemical Jinzhong Branch,Jinzhong 045400,China;Shanxi Xinyuan Coal Co.,Ltd.,Jinzhong 045400,China)
出处
《煤》
2026年第3期20-25,共6页
Coal
关键词
迎采巷道
切顶卸压
围岩变形
数值模拟
receiving coal mining roadway
roof caving for pressure relief
deformation of surrounding rock
numerical simulation
