论文部分内容阅读
为实现端头顶煤的最大化回收,根据端头区排头支架所处工作面位置、架型和工作面地质技术条件,建立了端头放煤三维模型,分析了端头区不同放煤区域和工艺参数对煤岩放落流动的影响规律以及顶煤回收率。研究发现随着端头区排头支架放煤架数增多,煤矸的位移矢量和运移范围明显增大,应力向工作面前方、巷道及煤柱侧转移,煤矸分界线变得不清晰,放出率减小、含矸率增大;根据顶煤回收率及对巷道稳定性的影响,把端头区顶煤划分为易放煤区、较易放煤区和较难放煤区,端头放煤以易放煤区和较易放煤区为主。由此提出了端头区放煤的原则,确定了端头区放煤的工艺方式和相关参数,现场应用取得了良好的技术经济效果。
In order to maximize the recovery of top coal, a three-dimensional model of coal caving is established according to the geological conditions of work face, frame and working face of the first support in the end zone, The influence of process parameters on the falling and flowing of coal rock and the top coal recovery rate. It is found that with the increase of the number of top coal caving frames in the tip area, the displacement vector and the migration range of coal gangue obviously increase. The stress shifts to the front of the working face, the side of the roadway and coal pillar and the boundary of coal gangue becomes unclear. According to the top coal recovery rate and the influence on roadway stability, the top coal in the terminal area is divided into easy-release coal area, easy coal release area and harder coal release area. The first release of coal to easy release of coal and coal-prone areas. Therefore, the principle of coal caving in the end zone was put forward, and the technological process and relevant parameters of coal caving in the end zone were determined. The field application achieved good technical and economical results.