中厚煤层切顶卸压沿空留巷参数设计与实践

为解决综采面间留设煤柱而导致的采掘接续紧张,资源回收率低,采空区易形成应力集中等问题,采用实验室实验、数值模拟和现场实践等方法,对97307工作面97214巷进行了切顶卸压沿空留巷技术研究。基于实验室实验,给出了煤岩体的物理力学参数,然后通过数值模拟分析给出了切顶高度、切顶角度、炮孔间距和补强支护等主要参数,最后在现场实践中将97214沿空留巷划分为四个区,不同区采用不同的支护方案和措施。巷道切顶卸压沿空留巷效果监测数据表明：采用切顶卸压留巷技术后,97307工作面切顶侧的支撑压力不仅低于未切顶侧巷,更远低于中部支架压力,巷道表面变形和离层分别在滞后工作面170m和200m处基本恒定不变,切顶卸压沿空留巷技术在97307工作面97214巷的现场实践中取得了良好的效果。

Parameter design and practice of Retaining Roadway along goaf for roof cutting and pressure relief in medium thick coal seam

In order to solve the problems of tense miningSand excavating, low resource recovery rate and stress concentration in goaf caused by setting coal pillars between lonwallSminingSfaces, the technology of roof cutting and pressure relief along goaf retaining roadway in 97214 roadway of 97307 working face is studied by means of laboratory experiment, numerical simulation and field practice. Based on laboratory experiments, the physical and mechanical parameters of coal and rock mass are given, and then the main parameters such as roof cutting height, roof cutting angle, blast hole spacing and reinforcement support are given through numerical simulation analysis. Finally, in field practice, 97214 gob side entry is divided into four areas, and different support schemes and measures are adopted in different areas. The monitoring data of gob side entry retaining effect by roof cutting and pressure relief show that: after adopting the roof cutting and pressure relief technology, the support pressure at the top cutting side of working face 97307 is not only lower than that at the side entry without roof cutting, but also lower than that at the middle support pressure, and the roadway surface deformation and separation layer are basically constant when they lag behind the working face 170m and 200m respectively, The technology of roof cutting and pressure relief gob side entry retaining has achieved good results in the field practice of 97214 roadway in 97307 working face.