预采顶分层凹凸型煤体巷道布置优化研究

Optimization Study on the Roadway Layout in “Concave-convex” Coal Body Mined by Advance Slicing Mining

针对某煤矿特殊开采条件形成的"凹凸"型煤体难以确定合理巷道位置的问题,运用理论计算、数值模拟的方法,开展了"凹凸"型煤体一次采全高时合理顺槽布置的研究,分析了上分层条带开采后的应力场分布规律,以及巷道不同位置时应力和变形情况,从而确定了顺槽最佳布置位置。结果表明:在该地质条件下,随着顺槽位置距采空区侧的距离越来越远,应力高峰逐渐向煤柱外侧转移,且有先增大后减小的趋势,当窄煤柱宽度为6m时,应力及位移量均最大;顺槽位置在煤柱中间时,巷道变形量及应力均最小,选择煤柱中间为最佳掘进位置。

Aiming at the problem that the ＂concave-convex＂ coal body formed by special mining conditions was difficult to determine the reasonable position of roadway in a coal mine, the study on the reasonable roadway layout in ＂concave-convex＂ coal body during full-seam mining was carried out by theoretical calculation and numerical simulation. The distribution of stress field after slicing mining of upper layer was analyzed, as well as the stress and deformation of roadway at different positions. Thus, the optimal position of roadway was determined. The results showed that under the geological conditions, the stress peak grad- ually shifted to the lateral pillar with the farther distance of crossheading from the goaf, and had a tendency to increase first and then decrease. When the width of narrow coal pillar was 6 m, the stress and displacement were the biggest. When the cross- heading located in the middle of coal pillar, the stress and deformation of roadway were the less. Therefore, the centre of coal pillars was the best driving position.