【作者】 刘泽；

【导师】 余伟健； 刘海；

【作者基本信息】 湖南科技大学 ， 矿业工程， 2020， 硕士

【摘要】 本文以广西百色右江矿务局林场煤矿3402工作面回风巷巷道为工程背景,围绕弱胶结粉砂岩巷道顶板支护与稳定性控制问题,采用现场调研、实验室试验、理论分析、数值模拟以及现场工程应用的综合研究方法,深入研究了弱胶结粉砂岩巷道围岩力学特性及稳定性控制,主要形成了以下研究成果:（1）通过现场调研,掌握了矿井地质概况、巷道断面参数、巷道围岩变形情况以及原始支护方案参数等,并取顶板部分岩样,根据巷道变形破坏情况以及微观结构和物化成分分析,总结了巷道围岩变形破坏机理。（2）针对3402工作面回风巷顶板特性进行了岩石力学单轴压缩试验和弱胶结试验,对岩块进行了强度以及遇水崩解试验,结果表明:巷道顶板松散软弱、强度低、自稳能力差且遇水易软化等,原有锚网索支护效果不佳。（3）根据弱胶结粉砂岩巷道围岩变形特征及失稳原因,以及力学特性试验结果提出合理的巷道围岩稳定性控制对策,再综合矿上实际经济和现场施工条件,设计了“超前注浆+顶板锚杆+锚索”组合支护方案。（4）对巷道围岩失稳机理进行结构力学分析,采用普氏拱理论及简支梁和超静定力学关系,通过力学分析得出围岩应力以及发生剪切滑移破坏的力学原理。根据现场地质条件使用Flac^3D数值模拟软件对弱胶结粉砂岩巷道顶板注浆前后作用效果,并且对提出补强优化支护方案进行模拟演化对比,结果表明:对破碎围岩顶板注浆加固后,采用锚杆+锚索联合支护的优化方案效果更佳。（5）基于林场煤矿弱胶结巷道围岩失稳特征,提出合理的稳定性控制原则,并从设计的几种补强支护方案中选出最优支护优化方案应用于现场,以便达到预期目的,实现弱胶结粉砂岩巷道围岩的长期稳定。更多还原

【Abstract】 Taking the 3402 working face roadway of Linchang Coal Mine of Youjiang Mining Bureau in Baise,Guangxi as the engineering background,the paper focuses on the roof support and stability control of weakly cemented Siltstone Roadway,in-situ investigation,laboratory test,theoretical analysis,simulation calculation and engineering design are used to study the mechanical properties and Stability Control of the surrounding rock of weakly cemented siltstone Roadway,the main results are as follows:(1)Through on-the-spot investigation,the general situation of the mine geology,the tunnel cross-section parameters,the tunnel surrounding rock deformation and the original support scheme parameters have been mastered,and some rock samples of the roof have been taken,based on the analysis of deformation and failure of roadway,microstructure and physicochemical composition,the instability mechanism of surrounding rock is summarized.(2)The uniaxlal compression test and weak cementation test of rock have been carried out according to the roof characteristics of 3402 working face roadway,and the strength and Hydrolysis test of rock block have been carried out,the results show that the roadway surrounding rock roof loose and weak,low strength,poor self-stability and water softening,the original support effect is not good.(3)According to the deformation characteristics and instability reasons of the surrounding rock of the weakly cemented siltstone Roadway and the test results of the mechanical properties,the reasonable control countermeasures of the stability of the tail teeth of the roadway are put forward,and then the actual economic and site construction conditions of the mine are synthesized,the combined support scheme of "advanced grouting + Roof Bolt + Anchor Cable" is designed.(4)The instability mechanism of roadway surrounding rock is analyzed by Structural mechanics theory and the instability condition is obtained by mechanical analysis.According to the site geological conditions,the original and the new support scheme are simulated by Abaqus numerical simulation software.The results show that the improved support scheme is more effective.(5)Based on the instability characteristics of the surrounding rock of weak cementation roadway in Linchang Coal Mine,the reasonable stability control principle is put forward.Finally,the new design scheme is carried out on site,and the monitoringdata is used to verify and evaluate the support effect.The monitoring results show that the optimized support scheme has good support effect and can maintain the long-term stability of roadway surrounding rock.更多还原