煤矿开采条件下滑坡的变形机理
Deformation Mechanism of Landslide Under the Condition of Coal Mining
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摘要: 采空滑坡的变形及破坏系由地下采煤诱发，以某采空滑坡为例，采用有限元方法，探讨采空区的受力特征以及采空滑坡的变形过程。结果表明：采空区的变形破坏主要在4种应力的作用下逐渐形成，并产生相应的应力集中区，即：拉张应力集中区、压应力集中区、剪应力集中区、鼓胀应力集中区。同时，通过对开挖前后滑坡的位移、应力以及应变的分析，推断出坡体的变形过程为：煤层开采-后缘拉裂-中部下陷-前缘剪切-滑坡发生。Abstract: The deformation and damage of goaf landslide induced by underground mining, taking a goaf landslide as an example, using finite element method, we explore the mechanical characteristics of goaf and the deformation process of goaf landslide. The results show that the deformation of the gob destruction gradually formed under the action of four main stress, and produced four kinds of stress concentration area, high tensile stress, high compressive stress, high shear stress clusters, high ballooning stress. At the same time, by comparing the landslide displacement, stress and strain before and after the excavation, we deduced the slope deformation process: the coal seam mining, trailing edge cracking, middle sagging, leading edge shearing and landslide.
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Keywords:
- goaf /
- goaf landslide /
- mechanical analysis /
- deformation mechanism /
- numerical simulation
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