采矿与安全工程学报2018，Vol.35Issue(1)：146-154,9.DOI:10.13545/j.cnki.jmse.2018.01.021
近全岩保护层开采理论研究及工程实践
Theoretical research on protective seam mining in full rock stratum and engineering application
摘要
Abstract
Protective seam mining is an effective way to mine out the outburst coal seams with high gas concentration and low permeability. In this paper, the technical idea of mining protective seam in rock stratum was put forward based on the engineering background and technical problems which are impossible to use conventional coal seam protective seam mining. The optimization design principle for mining protective seam in rock stratum was summarized on the basis of engineering geological condi-tions of coal seam of Pingdingshan No.12 coal mine. By analyzing the swelling deformation rate, the stress variation of coal seam, the utilization of equipment and economic and technical limitations, it was found that the optimal distance between the protective seam and the protected seam was 12 m and the optimal mining thickness of protective seam was 1.9 m. Based on the coal and rock exposure status of Ji14-31010 protective seam face in rock stratum, the key rock stratum mining equipment, such as the fully-mechanized hydraulic support, the coal cutter and the scraper conveyor were optimally selected. A coal (rock) breaking method combining the coal cutter and pre-splitting blasting was proposed and the auxiliary blasting technologies of blast holes in a single row and three crossing rows were designed spe-cifically. After mining Ji14-31010 protective seam in rock stratum was employed, the gas pressure of Ji14-31010 protected seam was decreased from 1.80 MPa to 0.35 MPa; the residual gas content was only 1.28 m3/t; the extraction rate was increased to 66％. Therefore, mining protective seam in rock stratum achieved a significant gas control effect.关键词
保护层开采/近全岩保护层/开采厚度/开采工艺/瓦斯卸压Key words
protective seam mining/protective seam in rock stratum/mining thickness/mining technology/gas pressure relief分类
矿业与冶金引用本文复制引用
刘银志,张强,张建国,权凯,魏思祥..近全岩保护层开采理论研究及工程实践[J].采矿与安全工程学报,2018,35(1):146-154,9.基金项目
国家自然科学基金青年科学基金项目(51704273) （51704273）
中国博士后科学基金项目(2016M601915) （2016M601915）
