深埋隧洞软岩变形控制和应力拱圈形成分析

Analysis of Soft Rock Deformation Control and Stress Arch Formation in Deep Buried Tunnels

就深埋隧洞在高地应力软岩环境应力拱圈的形成、应力拱圈的强度和围压作用,以及围岩变形控制机理进行论述。分析超前地质预报、减少围岩扰动、数学模拟及监测、主动让压支护、围岩约束平稳过渡对变形控制及应力拱圈形成的作用,以及分析主动让压支护成功案例,阐明控制围岩应力释放的同时又及时提供围压的主动让压支护体系和使围岩约束平稳过渡的措施可以推动应力拱圈形成,能承担高地应力环境下的压应力。

This paper discusses the formation of stress arches,the strength and confining pressure of stress arches,and the deformation control mechanism of surrounding rocks in deep buried tunnels in high stress soft rock environments.It analyzes the effects of advanced geological prediction,reduction of surrounding rock disturbance,mathematical simulation and monitoring,active pressure support,and stable transition of surrounding rock constraints on deformation control and stress arch formation,as well as successful cases of active pressure support.It clarifies that the active pressure support system that controls the release of surrounding rock stress while providing timely confining pressure and measures to ensure stable transition of surrounding rock constraints can promote the formation of stress arch,and can bear the compressive stress in high stress environments.