岩浆岩床下伏煤层采空区煤自燃致灾机制与防治  

Disaster occurred mechanism and prevention of coal spontaneous combustion in goaf of seam under magmatic rock bed

作　　者：王亮[1,2,3] 杨良伟 王瑞雪[1,3] 高杰 孙毅民 WANG Liang;YANG Liangwei;WANG Ruixue;GAO Jie;SUN Yimin(School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;School of Architecture andEnvironment, Ningxia Institute of Science and Technology, Shizuishan 753000, China;MOE Key Lab of Coal Mine Gas and Fire Preventionand Control, China University of Mining and Technology, Xuzhou 221116, China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]宁夏理工学院建筑与环境学院,宁夏石嘴山753000 [3]中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州221116

出　　处：《煤炭科学技术》2019年第1期125-131,共7页Coal Science and Technology

基　　金：国家自然科学基金面上资助项目(51674252);江苏高校"青蓝工程"资助项目(苏教师[2016]15号);江苏省六大人才高峰资助项目(GDZB-027)

摘　　要：针对淮北矿区杨柳煤矿岩浆岩床下伏高瓦斯煤层易自燃的现状,通过试验测试、数值模拟等方法对其采空区煤自燃致灾机制进行研究。结果表明:岩浆侵入的热变质作用使煤层的变质程度增加,使煤层吸收氧气的能力下降1.09%,自燃倾向性降低;开采期间,岩床起到了关键层作用,导致岩床下伏煤岩体离层裂隙发育,采空区压实程度降低,孔隙率的最大值约为无岩床覆盖时的1.55倍,渗透率最大值约为6.88倍;较大的孔隙率和渗透率使采空区漏风增大,氧化带范围扩大。在此基础上,构建了适合该地质条件的综合防灭火技术方案,有效防治了杨柳煤矿采空区遗煤自燃。Aiming at the status of spontaneous combustion of high gas coal seam under the magma rock bed of Yangliu Coal Mine in Huaibei Mining Area,the mechanism of spontaneous combustion of coal in goaf is studied by means of experimental tests and numerical simulation. The results showed that the thermal metamorphism of magma intrusion increased the degree of metamorphism of the coal seam,reduced the ability of the coal seam to absorb oxygen by 1.09%,and reduced the tendency of spontaneous combustion. During the mining period,the rock bed plays a key stratum,resulting in the separation fissure development of the rock mass under the rock bed. The degree of compaction in the goaf was reduced,the maximum porosity was about 1.55 times that of no bed cover,and the maximum permeability was about 6.88 times. The larger porosity and permeability made the goaf increase,and the oxidized zone was expanding. On this basis,a comprehensive fire prevention technical scheme suitable for the geological conditions was constructed,which effectively prevented the spontaneous combustion of the residual coal in the goaf of Yangliu Coal Mine.

关 键 词：岩浆岩床 煤层自燃 采空区流场 裂隙发育 

分 类 号：TD714[矿业工程—矿井通风与安全]