破碎岩体巷道非对称破坏与变形规律定量预计与评价

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.

Quantitative prediction and evaluation on the regularity of asymmetric damage and distortion upon broken rock mass roadways

Based on the comprehensive investigation of characteristics of the regional seismic geology, the spatial variability of rock properties, mining technical conditions and supporting patterns, the deformation and failure modes of broken rock mass roadways were quantitatively analyzed by FLAC3D numerical modeling. It is shown that the fracture depth in the roof, the strength of fractured rock mass and the rationality of supporting patterns have remarkable influences on the stability of the roadways. The analysis results are good consistent with the field monitoring ones, which indicates that the numerical analysis models are correct. Engineering practice indicated that the co-action of reinforced rock mass in the roof and two walls controlled the influence of asymmetric load and rock strength deterioration in two walls, which led to the reduction in asymmetric deformation, squeezed wall slipping and roof falling of the roadways.