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基于对倾斜煤层回采巷道断面形状、布置方式及失稳机制分析,进行了斜顶巷道基本支护力学计算,建立了斜顶巷道围岩再造承载层力学模型,确定了斜顶巷道再造承载层围岩稳定性影响因素,提出了斜顶巷道围岩再造承载层控制原则与控制技术,最后进行了数值模拟与现场试验。结果表明:倾斜煤层沿顶回采巷道顶煤体积减小,岩层顶板裸露,表层压力减小,但拱脚局部压力增大与松软煤体承载力降低易导致围岩失稳;斜顶巷道失稳分为两帮挤压流动失稳和顶板压缩错动失稳2种形式,两帮再造承载层位置越高、深度越长及顶板倾角越大,巷道围岩越稳定;斜顶巷道围岩再造承载层控制原则为基本支护控制浅部围岩、特殊锚杆锚固软弱煤体与再造承载层体强化的三体协同,采用设计三体协同支护方案后,顶板及两帮变形量受控,支护效果显著。
Based on the analysis of section shape, arrangement and instability mechanism of roadway in inclined coal seam, the basic support mechanics calculation of inclined roadway is carried out and the mechanics model of surrounding rock rebuilding bearing layer is set up. Rock stability. The control principle and control technology of surrounding rock reconstruction bearing layer in inclined-toothed roadway are proposed. Finally, numerical simulation and field test are carried out. The results show that the volume of top coal in mining roadways along the top of inclined seam decreases, the rock roof is exposed and the surface pressure is reduced. However, the local pressure of arch foot increases and the bearing capacity of soft coal decreases, which leads to instability of surrounding rock. It is divided into two forms, ie, two flows of squeezing flow instability and roof collapse. The higher the bearing position of the two gangs is, the longer the depth and the greater the inclination angle of the roof is, the more stable the surrounding rock of the roadway is. The control principle of bearing layer is the basic support and control of shallow surrounding rock, special anchor anchoring weak coal body and rebuilding bearing layer to strengthen the three-body synergy. With the design of three-body synergistic support scheme, the deformation of roof and two gangs is controlled , Support significant effect.