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为研究煤层自燃过程中,其上覆急倾斜且具有水平裂隙发育岩体组成的边坡稳定性的影响,及其内部破坏与外部形态之间的关系,使用基于颗粒流理论的PFC3D对煤层自燃过程进行了模拟,分析了煤层自燃对边坡稳定性造成的影响及原因,据此提出了模拟煤层自燃的颗粒流方法。对燃空区8种不同的工况进行了模拟研究,其结果表明:煤层自燃过程对边坡的影响可分为三个阶段:燃空深度在距坡脚60m时,坡脚处有岩体开裂现象,边坡外部轮廓变化不明显;120m时,边坡中下部岩体出现鼓凸,标志着边坡大规模变形过程;160m时,边坡坡面岩体鼓凸基本停止,内部岩体变形和运移趋于停止,边坡趋于稳定。据此可表明煤层自燃程度与边坡内部破坏和外部形态有一定的关系。
In order to study the influence of slope overlying steeply inclined rock mass with horizontal fissures and spontaneous combustion, and the relationship between internal failure and external morphology, PFC3D based on particle flow theory is used to predict the spontaneous combustion of coal seam spontaneous combustion The process was simulated and the influence of spontaneous combustion of coal seam on the stability of slope was analyzed. Based on this, the particle flow method to simulate coal spontaneous combustion was proposed. The results show that the influence of spontaneous combustion of coal seam on the slope can be divided into three stages: the depth of burial depth is 60m from the foot of slope, The phenomenon of dehiscence is not obvious at the outer profile of the slope. At 120m, the bulge of the rock mass in the middle and lower part of the slope appears, which indicates the large-scale deformation process of the slope. At 160m, Deformation and migration tend to stop, the slope tends to be stable. Based on this, it can be shown that the degree of spontaneous combustion of coal seam has a certain relationship with the internal damage and external shape of slope.