中文摘要：

巷道要经历开挖前稳定、开挖扰动、支护稳定或再破坏的演化过程,巷道稳定状态受原岩应力场-开挖扰动应力场-支护应力场相互作用的影响。采用FLAC~（3D）分析了不同预紧力与间排距条件下锚杆、锚索产生的围岩支护应力场的分布特征,定义了围岩应力扩大系数k来表征围岩应力的扩散效果,揭示了锚杆、锚索预紧力耦合支护效应。针对朱集西矿深部巷道特征与地质条件,提出了锚网索喷＋U型钢支架＋注浆＋底板锚注分步联合支护技术方案,开展了三维相似材料模型试验,验证了该支护技术方案的合理性与可行性,揭示了深部高应力软岩巷道围岩变形破坏与支护结构受力演化规律,并成功应用于工程实践,解决了深部高应力软岩巷道支护难题。监测结果表明,该联合支护方案有效地控制了深部高应力软岩巷道围岩大变形与底臌,保证了巷道围岩与支护结构的长期稳定及安全。

英文摘要：

The roadway experienced the whole evolution process, including the stability before excavation, excavation disturbance and support stability or failure. It is found that the steady state of the roadway was affected by the interaction of the in-situ stress field, excavation-induced stress field and supporting stress field. In this study, the finite difference program FLAC~（3D） was employed to analyze distribution characteristics of supporting stress fields in surrounding rock which were induced by the bolt and anchor cable under different conditions of pre-tightening force and inter-row distance. Furthermore, the coefficient k of rock stress expansion was defined to characterize the stress diffusion effect of surrounding rock. The coupling support effect of the bolt and anchor cable was revealed as well. A new approach was put forward by considering the special geological conditions and engineering characteristics of deep roadway in Zhujixi Mine. This approach was named as a step-by-step combined support technology consisting of cable anchor spraying, U type steel support, grouting, floor anchor and injection. A three-dimensional（3D） similar material model test was conducted to verify the approach, which revealed the deformation and failure of soft surrounding rock and the evolution laws of supporting structure under high stress conditions. This scheme was also successfully applied to a practical engineering project, which solved the support problem of deep soft rock roadway under high stress. The monitoring results indicate that the combined support scheme effectively control the large deformation and floor heave of deep soft rock roadway. Eventually, the long-term stability and safety of the roadway surrounding rock and supporting structure can be guaranteed.