含弱层巷道围岩滑移破坏规律的模拟研究
Simulation study on slip failure of roadway surrounding rocks containing weak layer
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摘要: 为研究弱层对煤矿巷道围岩滑移破坏的影响，基于UDEC岩土模拟软件，建立了含弱层煤矿巷道数值计算模型，对弱层与侧压力系数共同作用下巷道围岩滑移破坏规律展开研究。结果表明：弱层的存在改变了围岩中应力传递路径，减弱了围岩深部向煤帮的应力传递，促进了顶板向煤帮的应力传递，进而加剧围岩的剪切破坏与水平滑移；随弱层厚度增长，围岩临界破坏深度随之增大，煤体的剪切破坏也愈明显，围岩塑性区深度与水平滑移值也会进一步扩大；侧压力系数对含弱层巷道围岩的稳定性也具有重要影响，当侧压力系数为1.0时，煤帮围岩最为稳定，当侧压力系数介于1.0~2.0时，随侧压力系数的增大，围岩塑性区深度也会进一步增长，围岩滑移值呈非线性增长。Abstract: To study the influence of weak layer on the slip failure of surrounding rocks of coal mine roadway, numerical models of coal mine roadway with weak layer are created by using the numerical simulation software UDEC. The influencing laws on slip failure of roadway surrounding rocks under the weak layer and the lateral pressure coefficient are studied. The results show that the existence of weak layer changes the stress transmission path in the surrounding rocks and reduces the stress transmission from the deep part of surrounding rock to the coal wall and promotes the stress transmission from coal seam roof to the coal wall. The weak layer aggravates the shear failure and horizontal slip of surrounding rocks. With the increase of the thickness of the weak layer, the critical failure depth of surrounding rock increases, the shear failure of coal becomes more obvious, and the plastic zone depth and horizontal slip value of surrounding rock also further expand. The lateral pressure coefficient has an important influence on the stability of the surrounding rocks of roadway with weak layer. When the lateral pressure coefficient is 1.0, the surrounding rock of roadway is in the most stable state. When the lateral pressure coefficient is between 1.0 and 2.0, the plastic zone depth of surrounding rock will increase further with the increase of lateral pressure coefficient, and the slip value of surrounding rock will increase non-linearly.
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Keywords:
- weak layer /
- coal mine roadway /
- slip failure /
- discrete element /
- coal rock mass /
- critical failure depth
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