深部高应力软岩巷道耦合支护效应研究及应用

发布时间：2018-10-21 17:37

【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。
[Abstract]:The roadway must undergo the evolution process of stability, excavation disturbance, support stability or re-destruction before excavation. The stability of roadway is affected by the interaction between original rock stress field, excavation disturbance stress field and support stress field. FLAC~ (3D) is used to analyze the distribution characteristics of surrounding rock support stress field produced by anchor cables under different pre-tightening forces and spacing conditions. The stress expansion coefficient k is defined to characterize the diffusion effect of surrounding rock stress, and the anchor rod is revealed. The coupling support effect of anchor cable pretightening force. In view of the characteristics and geological conditions of deep roadway in Zhuji West Mine, the paper puts forward the technical scheme of combined support of bolting and grouting with U-shaped steel support, and carries out three-dimensional similar material model test. The rationality and feasibility of the support technology scheme are verified, and the law of deformation and failure of surrounding rock and the force evolution of supporting structure of deep soft rock roadway with high stress are revealed. It has been successfully applied in engineering practice and solved the difficult problem of support in deep soft rock roadway with high stress. The monitoring results show that the combined support scheme can effectively control the large deformation and floor heave of deep soft rock roadway with high stress and ensure the long-term stability and safety of roadway surrounding rock and supporting structure.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;山东科技大学山东省土木工程防灾减灾重点实验室;
【基金】：国家优秀青年科学基金(No.51322401) 国家自然科学基金项目(No.51574223,No.41572263,No.51323004) 中国博士后科学基金资助项目(No.2015M580493) 山东省土木工程防灾减灾重点实验室开放课题(No.CDPM2014KF03)~~
【分类号】：TD353

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