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采用FLAC3D软件建立了3种软硬岩不同组合形式的底板采动效应数值计算模型,探讨了不同岩性组合类型底板的应力分布、位移以及破坏深度变化规律。研究结果表明:软-硬-软组合底板破坏区在采掘工作面下方最大,贯穿硬岩夹层,而硬-软-硬组合底板类型由于存在软岩夹层,使得整体受到破坏,其底板破坏深度略低于均质硬岩底板。硬岩层内则易形成高应力集中区。
Using FLAC3D software, three kinds of numerical simulation models for mining floor effect with different combinations of soft and hard rock were established. The stress distribution, displacement and failure depth of different types of floor were discussed. The results show that the failure zone of the soft-hard-soft composite floor is the largest under the mining face and penetrates the hard-rock interlayer, while the hard-soft-hard composite floor type is destroyed due to the presence of soft-rock interlayer, Lower than a homogeneous hard rock floor. Hard rock formation is easy to form high stress concentration area.