采区大断面硐室围岩稳定性分析及其控制技术研究
发布时间：2018-09-10 09:45
【摘要】：采区大断面硐室是服务整个采区用作专门用途的硐室,一般与多个巷道硐室密集布置,力学环境复杂,其永久支护效果直接影响煤矿高效生产。采区皮带机头硐室一般位于采区运输上下山的端部,是运煤、排矸等重大系统的核心部位。本文以告成煤矿25采区皮带机头硐室围岩稳定性分析及其控制技术研究为背景,首先结合弹性力学模型和基于莫尔库伦准则的数值模型,分析硐室断面半径、宽高比和相邻硐室位置对大断面硐室围岩力学环境的影响,应用弹性力学半无限体理论,得出了一侧采空煤柱底板岩层应力分布情况;然后,根据现场调查告成煤矿25采区皮带机头硐室地质采矿条件及其围岩变形破坏特征,分析硐室变形破坏的主要影响因素,并采用数值模拟手段,对比分析硐室自身结构影响、多层巷道空间影响、支承压力影响三种条件硐室力学响应围岩破裂屈服范围、围岩变形及围岩应力分布情况。在上述研究的基础上,提出了高强二次锚网索支护+全断面注浆加固+底板高强锚网索支护的大断面支护技术,分析了该支护技术的机理,并采用数值模拟手段验证了该支护技术对复杂条件下大断面硐室围岩控制的有效性;最后,结合告成煤矿25采区皮带机头硐室地质采矿条件,根据全断面锚网索大断面支护技术核心,确定了硐室支护技术方案与参数,并进行了工业性试验,取得了良好效果。
[Abstract]:The large section chamber of mining area is a chamber which serves the whole mining area as a special purpose. Generally, it is densely arranged with many tunnel chambers, and the mechanical environment is complex. The permanent support effect directly affects the efficient production of coal mines. The head chamber of belt conveyor in mining area is generally located at the end of the upper and lower mountain transportation in the mining area, which is the core part of major systems such as coal transportation and gangue removal. In this paper, based on the study of surrounding rock stability analysis and control technology of belt conveyor head chamber in 25 mining area of Goucheng Coal Mine, the section radius of chamber is analyzed by combining elastic mechanics model and numerical model based on Moore Coulomb criterion. The influence of aspect ratio and adjacent chamber position on the surrounding rock mechanical environment of large section chamber is studied. The stress distribution of the bottom slab of coal pillar is obtained by using the theory of semi-infinite body of elastic mechanics. According to the site investigation of the geological mining conditions and the deformation and failure characteristics of surrounding rock in the head chamber of belt conveyor in 25 mining area of Gaocheng Coal Mine, the main influencing factors of the deformation and failure of the chamber are analyzed, and the influence of the chamber's own structure is analyzed by numerical simulation. The space effect of multi-layer roadway and the bearing pressure affect the mechanical response of the chamber to the failure and yield range of surrounding rock, the deformation of surrounding rock and the distribution of stress of surrounding rock. On the basis of the above research, the large section support technology of high strength secondary bolting wire mesh and cable supporting is put forward, and the mechanism of this support technology is analyzed. Numerical simulation is used to verify the effectiveness of this support technology in controlling the surrounding rock of large section chamber under complex conditions. Finally, combined with the geological mining conditions of head chamber of belt machine in 25 mining area of Gaocheng Coal Mine, According to the technical core of bolt-mesh cable large-section support with full section, the technical scheme and parameters of chamber support are determined, and industrial tests are carried out, and good results are obtained.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD354
本文编号：2234087
[Abstract]:The large section chamber of mining area is a chamber which serves the whole mining area as a special purpose. Generally, it is densely arranged with many tunnel chambers, and the mechanical environment is complex. The permanent support effect directly affects the efficient production of coal mines. The head chamber of belt conveyor in mining area is generally located at the end of the upper and lower mountain transportation in the mining area, which is the core part of major systems such as coal transportation and gangue removal. In this paper, based on the study of surrounding rock stability analysis and control technology of belt conveyor head chamber in 25 mining area of Goucheng Coal Mine, the section radius of chamber is analyzed by combining elastic mechanics model and numerical model based on Moore Coulomb criterion. The influence of aspect ratio and adjacent chamber position on the surrounding rock mechanical environment of large section chamber is studied. The stress distribution of the bottom slab of coal pillar is obtained by using the theory of semi-infinite body of elastic mechanics. According to the site investigation of the geological mining conditions and the deformation and failure characteristics of surrounding rock in the head chamber of belt conveyor in 25 mining area of Gaocheng Coal Mine, the main influencing factors of the deformation and failure of the chamber are analyzed, and the influence of the chamber's own structure is analyzed by numerical simulation. The space effect of multi-layer roadway and the bearing pressure affect the mechanical response of the chamber to the failure and yield range of surrounding rock, the deformation of surrounding rock and the distribution of stress of surrounding rock. On the basis of the above research, the large section support technology of high strength secondary bolting wire mesh and cable supporting is put forward, and the mechanism of this support technology is analyzed. Numerical simulation is used to verify the effectiveness of this support technology in controlling the surrounding rock of large section chamber under complex conditions. Finally, combined with the geological mining conditions of head chamber of belt machine in 25 mining area of Gaocheng Coal Mine, According to the technical core of bolt-mesh cable large-section support with full section, the technical scheme and parameters of chamber support are determined, and industrial tests are carried out, and good results are obtained.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD354
【引证文献】
相关会议论文 前1条
1 康红普;林健;吴拥政;;高应力巷道强力锚杆支护技术及应用[A];第十届全国岩石力学与工程学术大会论文集[C];2008年
，本文编号：2234087
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