深部巷道全空间协同控制技术及应用

Full-space collaborative control technology and its application for deeply buried roadways

深部巷道支护受地应力和围岩力学特性共同影响,且支护方式多样化。该文系统总结了深部巷道围岩变形破坏的典型特征,提出了深部巷道全空间协同控制技术,其对不同地质条件下深部巷道的支护方式和参数进行针对性优化设计。阐释了全空间协同控制的力学原理:"全空间支护、刚柔协同、让压释能、动态监测、局部加强",其核心是锚网索全空间协同控制,充分发挥围岩的自承能力。对比分析了不同预紧力条件下单体锚索、传统桁架和全空间桁架预应力场差异。研究表明,全空间桁架的最大预应力能比单体锚索提升了35%~40%。模拟分析知围岩黏聚力、内摩擦角和弹性模量为巷道变形主控因素。现场实践表明,全空间协同控制技术能够有效控制不同埋深巷道围岩变形。

Deep roadways use a variety of support methods with the support strength influenced by the ground stresses and the mechanical parameters of the surrounding rock. This paper summarizes the deformation characteristics of deep roadways. The full-space collaborative control method given here uses targeted optimization of the support methods and properties. Full-space collaborative control optimizes the soil rigidity and flexibility, pressure release, rock dynamics, and local reinforcement. The objective is to fully use the self-supporting capacity of the surrounding rock. The prestress fields are compared for a single anchor cable, a traditional truss and a space truss for various preloadings. The maximum prestress of the full space truss is 35%~40% higher than that of the single anchor cable. Additionally, simulations show that the cohesion, the internal friction angle and the elastic modulus all greatly influence the roadway deformation. Field practice shows that this design method can effectively control the deformation of the surrounding rock for roadways buried at various depths.