14煤层开采铺设金属网人工假顶可行性分析
Feasibility Analysis of Laying Metal Mesh Artificial False Roof in 14th Coal Seam Mining
靳京爵 1李涛 2郭东旭2
作者信息
- 1. 新疆工程学院新疆煤矿灾害智能防控与应急重点实验室,新疆 乌鲁木齐 830023;新疆工程学院安全科学与工程学院,新疆 乌鲁木齐 830023;辽宁工程技术大学新疆研究院,新疆 乌鲁木齐 830023
- 2. 辽宁工程技术大学新疆研究院,新疆 乌鲁木齐 830023;辽宁工程技术大学矿业学院,辽宁 阜新 123000
- 折叠
摘要
胜利煤矿一采区规划开采的煤层为14煤层和近距离下伏的15煤层,为确保在采15煤层的开采安全,提出在开采 14 煤层时工作面顶板铺设金属网形成人工假顶,对 14 煤开采后的人工假顶进行可靠性分析,采用简支梁稳定分析法,确定人工假顶极限状态的厚度为 5.74 m.根据水化学实验可得,采空区积水对铺设金属网有腐蚀性,分析采空区铺设的金属网有效赋存时间不超过3 a.结合再生顶板形成时间分析确定,当15煤层与14煤层存在1 m以上的层间距时,15煤至少需要在14煤层开采完毕3.5 a后进行采掘活动;当15煤层与14煤层合层时,15煤至少需要在14煤层开采完毕5 a后进行采掘活动.
Abstract
The planned mining coal seams for the first mining area of Shengli Coal Mine are the 14th coal seam and the nearby underlying 15th coal seam.To ensure the safety of mining the 15th coal seam,it is proposed to lay a metal mesh on the roof of the working face to form an artificial false roof during the mining of the 14th coal seam.The reliability analysis of artificial false roof after the 14th coal mining is carried out,and the simply supported beam stability analysis method is used to determine the thickness of the artificial false roof limit state to be 5.74 m.According to hydrochemical experiments,it is concluded that the accumulated water in goaf is corrosive to the laying of metal mesh.It is analyzed that the effective occurrence time of the metal mesh laid in the goaf will not exceed 3 years.Combined with the analysis of the formation time of the regenerated roof,it is determined that when there is a layer spacing of more than 1 m between the 15th coal seam and the 14th coal seam,mining activities for the 15th coal need to be carried out at least 3.5 years after the completion of mining for the 14th coal seam;When the 15th coal seam merges with the 14th coal seam,mining activities for the 15th coal need to be carried out at least 5 years after the completion of mining for the 14th coal seam.
关键词
金属网/再生/顶板/稳定Key words
metal mesh/regenerate/roof/stable引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据