摘要
破碎围岩条件下大断面巷道开挖必然形成大范围采空区,该区域内围岩介质的变形失稳行为很复杂,这为工程失稳及灾害防治带来挑战。羊场湾煤矿位于西部强震区域,岩体节理与裂隙非常发育,主采的2#煤层顶底板岩层松软破碎,开挖断面最大达20.4 m2,多次发生冒落失稳现象。文章首先进行了现场工程动力失稳分析,结合松动圈测试技术和数值模拟试验,系统地分析了松软破碎围岩局部化变形与演化失稳特征和规律;最终确定了巷道的支护形式与参数,确保了巷道安全与稳定,这对破碎围岩条件下煤矿安全开采具有重要意义。
The large scale of mined- out- area（LSMA） will be caused inevitably due to excavation of a large scale across- section in crushed rock- mass conditions, and its failure behavior and process is very complex. This brought challenge for engineering unstable control and hazard prevention. Owing to historically seismic - action, the broken rock- mass brought engineering structure destabilization. Yangchangwan coalfield locates the western seismic - region, joints and cracks of rock - mass are very abundant. The phenomenon in the form of roof failing occurred frequently. The rockmass is soften and fractured, with the maximum cross - section area of 20.4 m^2 in Yangchangwan Coal Mine. There happened several large scale collapsel instability phenomena in EDZ. Firstly, the field engineering geological environment and dynamical instability of roadway were generally investigated. Secondly, the analysis of the RSM and numerical computation as prediction had been adopted. All those were intended to seek the mechanism on localization deformation and destabilization in softening and crushed rock - mass conditions at large. This research is very significant to safe mining.
出处
《煤炭技术》
CAS
2008年第12期76-78,共3页
Coal Technology
关键词
破碎围岩
动力失稳
松动圈测试
数值模拟
crushed rock - mass
dynamic instability
RSM
numerical computation
