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采用理论分析和数值模拟方法,分析长壁工作面顺槽和开切眼交叉口煤柱、顶板和底板的应力场与位移场分布特征,以确定围岩稳定性状况。研究结果表明:由于受二次应力场叠加的影响,煤柱在交叉口拐角处围岩裂化,形成较大范围的弧形三角形卸压区,此处是煤壁片帮严重、顶板下沉剧烈区和底鼓区集中的地方;交叉口处围岩的强扰动区域半径大约是巷道的宽度;建议在强扰动区域内采用整体锚固方式,加大锚杆、锚索支护的强度、深度和密度,并采用锚网、钢带和钢筋梁等支护构件,必要时利用单体支柱支护顶板。研究结果可以给同类条件下长壁工作面的开采支护提供参考。
The theoretical analysis and numerical simulation are used to analyze the distribution of stress field and displacement field of coal pillar, roof and floor in the intersection of longwall face and open cut, so as to determine the stability of surrounding rock. The results show that due to the influence of the secondary stress field superimposition, the coal pillar cracks around the corner of the intersection, forming a large range of arc-shaped triangular pressure relief zone, where the wall of the coal wall is serious and the roof sinks violently Area and bottom drum area; the radius of strong disturbance area of surrounding rock at the intersection is about the width of the roadway; it is suggested that the overall anchoring method should be adopted in the area of strong disturbance to increase the strength and depth of the anchor and anchor cable support Density, and the use of anchor network, steel and steel beams and other supporting components, if necessary, the use of single prop supporting the roof. The research results can provide a reference for the mining support of longwall face under similar conditions.