深部岩巷分区破裂围岩稳定性控制方法及应用

深部高地应力岩巷开挖后围岩内出现分区破裂现象，采用传统的原设计方案巷道稳定性差。根据巷道围岩变形破坏的现场监测结果，经过理论分析和支护试验，提出了“提高法向约束、锚杆增韧止裂、协调耦合支护、应力内部转移、分区充填注浆、增强围岩强度”的锚注一体化综合控制方法理念。并提出了相对应的综合支护技术，即首先采用高预紧力超强锚杆及时支护围岩，锚杆的长度和数量分别由监测结果和分区支护能量判据确定；其次采用高强锚索让压梁支护巷道顶板，实现锚杆、锚索的协调耦合支护和围岩应力内部转移；最后采用中空分段螺旋式注浆技术进行滞后加固。最后针对监测巷道采用锚注一体化综合控制方法和技术进行了支护优化设计并进行现场支护试验，监测结果表明，优化支护的巷道稳定性良好。

Control methods of stability of zonal disintegration surrounding rock in deep rock roadway and its application

Zonal disintergration phenomenon will appear after excavation in deep high stress roadway; and its stability is not very good according to the original control design. According to the on-site monitoring results of the surrounding rock deformation, through theoretical analysis and supporting test, a new bolting and grouting integrated control method is proposed. The new method includes six important issues: improving normal constraints, toughening crack arrest of bolt, coordinating of coupling support, transferring stress into internal, filling grouting of the partition, enhancing rock strength. The corresponding integrated support technology is also proposed. Firstly, high strength and high pre-tightening force bolts are used to support surrounding rock in time. The length and number of bolts is determined by the results of monitoring and partition support energy criterion respectively. Secondly, the pressure relief high-strength anchor-beam coupling support system is used to support the roof of roadway; and surrounding rock deformation compatibility is achieved and stress is transformed internally. Finally, a hollow segmented spiral delayed grouting technology is used to reinforce the cracked surrounding rock of zonal disintegration. According to above bolting and grouting integrated control method and techniques, the roadway support is designed optimizedly and applied to site tests. The monitoring results show the roadway is in stable condition.