Coal Industry Taiyuan and Research Institute Group Co. , Ltd.

单翼开采矿井为解决采掘接替紧张的问题,常会出现迎采对掘的情况,而迎采动掘巷期间,矿压显现规律和煤柱宽度的确定是巷道掘进及安全回采的关键。以炭窑坪煤业100303运输巷迎采掘巷期间为工程背景,采用理论分析、数值模拟、现场监测等方法,对煤柱的合理宽度及迎采期间的矿压显现规律进行研究分析。主要结论有:通过理论计算,煤柱在受到掘进扰动和工作面采动的双重影响下,确保煤柱不完全发生塑形破坏且存在弹性核的宽度至少为30m。数值模拟发现,掘进迎头至相遇位置前方20~30m时,围岩变形开始增大,煤柱帮和回采帮变形量均超过0.5m。当掘进至采空区后方一定距离后,围岩因同时受掘进扰动与采空区侧向支承应力的叠加影响,变形增幅加快,煤柱帮变形严重,最大变形量超1m。提出100303运输巷掘进距100302综采工作面70m时,停止掘进,在迎采扰动范围内,优化支护参数,提高煤柱承载能力。现场监测表明,巷道顶底板和两帮均变形较小均在可控范围内,有效控制了迎采动工作面掘巷的围岩变形。

In order to solve the problem of tight mining succession in single wing mining mines, there is often a situation of opposite excavation. During the excavation, determining the law of strata behaviors and the width of coal pillars is the key to roadway excavation and safe recovery. We took the transportation roadway of Tanyaoping Coal Mine as the engineering background, and used theoretical analysis, numerical simulation, on-site monitoring and other methods to study the reasonable width of the coal pillar and the law of strata behaviors during the excavation period. According to the theoretical calculations, under the dual influence of excavation disturbance and mining on the working face, it is ensured that the coal pillar does not completely undergo plastic failure and has an elastic core width of at least m. According to the numerical simulations, when the heading face reaches 20-30 m in front of the meeting position, the surrounding rock deformation begins to increase, and the deformation of the coal pillar and mining sides both exceed 0. 5 m; When the excavation reaches a certain distance behind the goaf, the surrounding rock deformation accelerates due to the combined influence of excavation disturbance and side abutment pressure in the goaf, resulting in severe deformation of the coal pillar wall, the maximum deformation is over m. So, it’s proposed when the excavation distance of the transportation roadway is m from the fully mechanized mining face, the excavation should be stopped, and the support parameters should be optimized within the disturbance range to improve the bearing capacity of the coal pillar. On-site monitoring showed that, the deformation of the roof, floor, and two sides of the roadway was small and within a controllable range, the surrounding rock deformation was controlled.

宗保东,陈立虎.迎采动宽煤柱承载特性及矿压显现规律研究[J].煤炭工程,2024,56(4):1-7.