摘要
煤矿安全生产压力巨大,普遍存在巷道过度支护现象,即使是坚硬致密且厚度大的灰岩顶板也不敢裸顶。以邱集煤矿1102轨道煤巷为背景,通过构建坚硬顶板变形分析模型,量化五灰厚度在控制巷道变形中的作用,利用数值模拟检验理论计算结果,并通过现场试验和监测复验研究成果。研究表明:随着五灰厚度增加,顶板变形不断减小;当五灰达到1.5 m厚时,顶板变形与厚度0.2 m相比减小了77.4%,塑性区减小40.5%。1102轨道煤巷五灰厚度均大于1.5 m,采用顶板不支护、巷帮锚网支护的方案,顶底收敛量极小,两帮收敛量小于15 mm,巷帮锚杆受力稳定,顶板测力锚杆(索)施加预紧力后不升反降,窥视未见顶板裂隙及离层,满足安全需求。
The safety production pressure in coal mines is huge,and there is a general phenomenon of over-supporting in roadways.Even hard and dense thick limestone roofs do not dare to be unsupported.1102 track roadways of Qiuji Coal Mine is taken as the engineering background,by constructing a hard roof deformation analysis model,quantifying the role of the fifth layer limestone thickness in controlling roadway deformation,using numerical simulation to verify theoretical calculation results,using field test and monitoring reinspection research results.The research shows that as the thickness of limestone increases,the roof deformation decreases continuously and the self-stability of the roadway increases.When the thickness of the fifth layer limestone reaches 1.5 m,the deformation of the roof is reduced by 77.4% compared with the thickness of 0.2 m,and the plastic zone is reduced by 40.5%.The thickness of the fifth layer of limestone in 1102 track roadway is greater than 1.5 m.The scheme of without supporting in the roadway roof and the anchor net supporting on both sides of the roadway is adopted.The results show that the vertical convergence of the roadway is extremely small,and the convergence on both sides of the roadway is less than 15 mm.The cables on both sides of the roadway are under stable force.The roof force measuring bolt(cable)does not rise but falls back after applying the pre-tightening force and no cracks and separation can be seen in the roof peep to meet the safety requirements.
作者
武善元
朱庆文
云明
李廷春
徐庆国
郭洪运
WU Shanyuan;ZHU Qingwen;YUN Ming;LI Tingchun;XU Qingguo;GUO Hongyun(l.Shandong Qiuji Coal Mine Limited Company,Dezhou 251102,China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《煤矿安全》
CAS
北大核心
2020年第12期93-99,共7页
Safety in Coal Mines
基金
国家自然科学基金资助项目(41772299)。
关键词
坚硬顶板
巷道支护
理论分析
数值模拟
稳定性
hard roof
roadway support
theoretical analysis
numerical simulation
stability
