深井大断面双巷布置回采巷道破坏机制及控制技术
Damage Mechanism and Control Technology of Mining Roadway with Large Cross Section and Double Roadway Layout in Deep Mine
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摘要: 为解决深井大断面双巷布置回采巷道二次采动期间围岩控制问题,以刘庄矿6203工作面回风巷为工程背景,根据现场实际观测情况分析了巷道变形特征,即回采期间巷道变形表现为底鼓量大于顶板下沉,煤柱帮变形远大于实体煤帮的非对称形态,巷道底板及煤柱帮围岩变形最严重。在此基础上分析了护巷煤柱、围岩应力、围岩强度、支护形式对巷道底鼓的影响,认为护巷煤柱尺寸过小,支护参数不合理是导致巷道破坏变形的主要原因。提出了改变护巷煤柱尺寸、优化巷道支护参数、局部注浆和留设卸压槽的底鼓控制技术。通过工程实践表明,新的支护方案使巷道围岩得到了有效控制,具有良好的安全技术经济效益。Abstract: In order to solve the problem of surrounding rock control during the second mining period of the mining roadway with large cross-section and double roadway layout in deep mine, taking 6203 working face air return roadway of Liuzhuang Coal Mine as the engineering background, firstly, the deformation characteristics of roadway were analyzed based on the actual observation. That is to say, roadway deformation during stoping shows that floor heave is larger than roof subsidence, coal pillar wall deformation is much larger than the asymmetric shape of solid coal wall, and roadway floor and coal pillar wall rock deformation is the most serious. On this basis, the influences of roadway pillar, surrounding rock stress, surrounding rock strength and support form on roadway floor heave are analyzed. It is considered that the small size of coal pillar and unreasonable supporting parameters are the main causes of roadway failure and deformation. The bottom heave control technology of changing the size of coal pillar, optimizing the supporting parameters of roadway, local grouting and setting unloading pressure trough is proposed. The engineering practice shows that the new support scheme can effectively control the roadway surrounding rock and has good safety, technical and economic benefits.
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Keywords:
- deep mine /
- large section roadway /
- double roadway layout /
- coal pillar /
- support parameters /
- control technology
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