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在综合分析区域地质(震)特征、岩体空间变异性特征、开采技术条件和支护模式的基础上,利用FLAC3D程序,定量评价了破碎岩体巷道非对称破坏与变形特征.与现场监测对比分析表明,顶部破碎岩层深度、劣化后的岩体强度以及支护模式的合理性等对巷道岩体破坏的影响比较显著,锚杆(索)将破碎岩体与深层稳定岩体承接起来共同控制结构稳定性,从而进一步验证了计算模型的正确性和可行性.工程实践表明,加固后完整稳定顶部岩体与两帮煤体共同控制了非对称载荷作用和煤壁力学强度的劣化,减少了非对称变形、煤壁挤压及滑落失稳,进而有效遏制冒顶的发生.
Based on the comprehensive analysis of the regional geological (seismic) characteristics, the spatial variability of rock mass, the technical conditions of mining and the supporting modes, the FLAC3D program is used to quantitatively evaluate the asymmetric damage and deformation characteristics of the broken rock roadway. The analysis shows that the influence of the depth of the top crushed rock, the strength of the deteriorated rock mass and the support pattern on the rock mass destruction is significant, and the rock bolt (cable) jointly takes control of the fractured rock mass and the deep stable rock mass The stability of the structure is verified and the correctness and feasibility of the calculation model are further verified.The engineering practice shows that the complete and stable top rock mass after reinforcement and the two coal gangues jointly control the asymmetric load and the deterioration of the mechanical strength of the coal wall, Asymmetric deformation, coal wall extrusion and sliding instability, and thus effectively curb the occurrence of the roof.