摘要
为确定某煤矿安全生产的巷道支护方案,以其601综采工作面顺槽开挖为背景,利用FLAC2D数值软件模拟,并对比分析了有无预应力桁架2种支护方案下巷道围岩的位移、应力和塑性区分布状态.结果表明:采用原支护方案时,巷道顶板、两肩角及两帮等多处出现应力集中,塑性区域较大,并且巷道的变形量大,两帮的变形位移高达1 m;采用预应力桁架支护时,巷道顶板应力分布状况良好,只有两肩角及两帮深处岩体出现了应力集中,但塑性区域明显减小,巷道变形有较大改善,两帮变形位移降至0.010 6 m,深部软岩巷道的损伤变形降低显著,在实际应用中取得了良好的效果,为煤巷支护设计提供了一种可行的方法.
In order to determine a roadway supporting schemes of coal mine safety production, base on the background of the excavation in the mining gateway of 601 fully mechanized coal mining face in a coal mine, prestressed truss supporting scheme and non-prestressed truss supporting scheme of surrounding rock of roadway displacement, stress distribution and plastic zone of surrounding rock are compared and analyzed by FLAC2D numerical simulation software of theoretical calculation. The results show that using the original s upport scheme, stress concentration occurs in tunnel roof , roof corners and both sides of the roadway. Plastic zone is large and roadway undergoes great deformation. Displacements on both sides of the roadway are up to 1 m. When adopting prestressed truss support, the stress distribution in the tunnel roof is in good condition, but concentration of stress occurs in the roof corners and sides of the roadway rock stress. Plastic zone is distinctly smaller and the deformation of roadway improves substantially. Deformation displacements on both sides of the roadway are reduced to 0.0106 m, so the deformation of deep soft roadway decreased significantly. A feasible method for the design of the mining gateway support is provided and performs well in practical application.
出处
《有色金属科学与工程》
CAS
2014年第2期81-86,共6页
Nonferrous Metals Science and Engineering
基金
"十二五"国家科技支撑计划课题(2012BAC11B07)
江西省科技支撑计划项目(20132BBG70106)
关键词
深部软岩巷道
数值模拟
支护设计
预应力桁架
deep soft roadway
numerical simulation
supporting design
prestressed truss
