沿空留巷巷旁墙体稳定性关键影响因素模拟

Simulation on Key Influencing Factors of Stability of Roadside Wall in Gob-side Entry Retaining

为了更好地研究沿空留巷巷旁墙体的稳定性,运用正交试验和FLAC3D数值模拟相结合的方法,分析了墙体强度、墙体宽度、埋深、采高、直接顶厚度等因素对巷旁墙体的稳定性的影响,接着对模拟所得结果进行极差分析,确定因素重要程度,为相关研究提供指导。模拟结果表明:当墙体宽度一定时,顶底板变形量有相似的变化趋势,只是巷旁墙体埋深变化不大时,顶底板变化幅度较小;但是当墙体宽2 m或3 m时,此种变化更加明显,这说明当墙体宽度较小时,巷旁墙体的稳定性容易受到其他因素的影响,而当墙体宽度逐渐增加时,巷旁墙体的稳定性所受其他因素影响也逐渐变小。通过对模拟结果的极差分析,得出左右巷旁墙体稳定性关键因素影响大小为:墙体宽度>墙体埋深>墙体强度>采高>直接顶厚度。

In order to better study the stability of the wall along the roadway,using the orthogonal experiment and FLAC3 D numerical simulation, the effects of wall strength, width, depth, height and thickness of direct roof on the stability of the wall are analyzed, then the results of the simulation are analyzed to determine the importance of the factors and provide guidance for related research. The simulation results show that the deformation of roof and floor has similar variation trend when the wall width is certain, however, when the buried depth of the wall around the lane changes little, the variation range of roof and floor is small.But, when the wall width is 2 m or 3 m, the change is more obvious. This shows that when the wall width is relatively small, the stability of the roadside wall is easily affected by other factors, and when the wall width gradually increases, the stability of the roadside wall affected by other factors is small. Through the analysis of extreme difference of simulation results, it is concluded that the key factors affecting the stability of the roadside wall of the left and right lane are: wall width > buried depth of wall >wall strength > mining height > direct roof thickness.