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针对水系发育的铝土矿床及岩层在开挖采动后的突水特征及围岩支护失效破坏特点,研究岩体裂隙演化扩张到宏观变形破坏机制,利用FLAC3D的流固耦合模型动态分析地渗流场对地下开挖工程的渗入途径及损坏过程,得到渗流场-应力场耦合下开挖途径。并针对性制定地下水防治控制对策,系统研究开发复杂破碎围岩条件下开挖巷道支护新方案,优化设计超前小导管注浆技术与喷锚网联合支护方案,并对比分析联合支护技术施工后开挖巷道围岩变形收敛量、围岩应力分布、破坏特征及支护效果。通过现场围岩变形和锚固系统受力状态监测工业试验,试验数据表明该联合支护方案在地下水发育的软弱破碎铝土矿床巷道掘进工程效果优良,可以为条件类似巷道支护选择提供参考。
Aiming at the characteristics of water inrush from bauxite deposits and rock strata after excavation and mining and the failure and failure characteristics of surrounding rock support, the mechanism of macroscopic deformation and failure of rock fissures evolves and expands, the dynamic analysis of fluid-structure interaction model by FLAC3D Ground seepage field of underground excavation infiltration route and damage process, get the seepage field - stress field coupled with the way of excavation. In order to develop groundwater prevention and control measures, a systematic research and development of complex crushing surrounding rock excavation tunnel under the conditions of the new program, the optimal design of small pilot pipe grouting technology and spray anchor net joint support program, and comparative analysis of the joint support technology Convergence and deformation of surrounding rock after excavation, stress distribution of surrounding rock, failure characteristics and supporting effect. Through field tests on the deformation of surrounding rock and the monitoring of the stress state of the anchoring system, the experimental data show that the tunneling project of the weakly crushed bauxite deposit developed in the groundwater is of good effect and can provide reference for the similar conditions of roadway support selection.