深部软岩巷道锚注支护机理数值模拟研究

Numerical simulation research of bolt-grouting supporting mechanism in deep soft rock roadway

自主研制了破裂岩样承压注浆试验设备,开展了破裂岩体注浆加固力学特性试验,分析了破裂岩样注浆加固前后的力学特性与微观结构。提出了"锚注加固体等效层"概念,采用FLAC^(3D)数值模拟研究了深部软岩巷道锚注支护机理,揭示了"锚注加固体等效层"厚度、弹性模量、内聚力、内摩擦角对巷道围岩位移及塑性区的影响规律,即随着"锚注加固体等效层"参数的提高,巷道围岩位移及塑性区随之降低,体现了注浆可提高破裂岩体的完整性与强度,为锚注支护参数优化设计奠定了基础。

Grouting test equipment for cracked rock mass has been developed independently, and grouting reinforcement test has been done on cracked rock mass. Mechanical characteristics and microstructure of cracked rock before and after grouting reinforcement have been explored. Concept of ＂equivalent layer of bolt-grouting reinforcement＂has been proposed. Mechanism of bolt-grouting supporting in deep soft rock roadway has been studied with the method of FLAC（3D）. Influence of displacement and plastic zone under different thickness, elastic modulus, cohesion and internal friction angle of bolt-grouting reinforcement equivalent layer has been revealed. The paper has shown that as the parameter of the equivalent layer of bolt-grouting reinforcement improves, plastic zone and displacement of roadway surrounding rock have reduces, which has reflected that the grout can improve the integrity and strength of cracked rock mass. Research has laid a foundation for parameter optimization design of bolt-grouting supporting.