厚煤层大采高液压支架片帮控制技术研究

发布时间：2019-01-12 17:34

【摘要】：厚煤层大采高工作面顶板下沉空间大,煤体承担载荷较高,同时受大采高开采工艺影响,片帮事故多发,严重影响井下安全高效生产。论文针对厚煤层片帮机理进行研究,解决大采高液压支架片帮控制问题,对厚煤层安全高效生产具有一定的工程应用价值。论文首先根据厚煤层工作面实际工况条件,使用UDEC建立数值模型,分析厚煤层工作面顶板运动破坏规律;通过FLAC3D模拟分析顶板岩层结构对煤壁稳定性的影响,同时建立厚煤层围岩耦合模型,分析不同裂断步距造成应力变化情况,以确定煤体稳定受围岩运动影响变化特征;依据厚煤层顶板运动破坏规律,明确支护强度,基于该强度范围提出大采高液压支架主要部件设计要求并提出改进措施,通过顶板支护实现片帮控制;同时论文通过开采工艺对煤壁稳定性影响,进行大采高液压支架对工作面推进速度、顺槽布置、开采截深的适应性分析,并基于不同开采工艺提出片帮控制措施;分析干扰变量,结合FLAC3D模拟确定厚煤层煤壁最佳护帮长度,明确大采高液压支架护帮机构主要参数,并提出改进方案,基于煤壁护帮实现片帮控制。论文通过厚煤层片帮机理研究,确定最佳支护强度,优化其顶板支护能力,降低煤体承担载荷;结合大采高开采工艺与煤壁片帮影响关系,进行大采高液压支架适应性分析,优化液压支架在不同开采工艺下防片帮能力;根据煤体应力变化特征提出护帮板等关键部件设计及尺寸要求,论文研究有助于提高大采高液压支架防片帮能力,对生产现场具有一定指导作用。
[Abstract]:The roof subsidence space of large mining face in thick coal seam is large, the load of coal body is high, and at the same time, influenced by mining technology of large mining height, the accidents of sheet side are frequent, which seriously affects the safety and efficiency of underground production. In this paper, the mechanism of thick coal seam cover is studied to solve the control problem of hydraulic support for large mining height, which has certain engineering application value for safe and efficient production of thick coal seam. Firstly, according to the actual working conditions of thick coal seam working face, UDEC is used to establish a numerical model to analyze the rule of roof motion failure in thick coal seam working face. The influence of roof rock structure on the stability of coal wall is analyzed by FLAC3D simulation. At the same time, the coupling model of surrounding rock in thick coal seam is established, and the stress change caused by different crack step distance is analyzed to determine the change characteristics of coal stability affected by surrounding rock movement. According to the rule of roof motion and failure in thick coal seam, the support strength is defined. Based on the strength range, the design requirements of main components of hydraulic support with large mining height are put forward, and the improvement measures are put forward. At the same time, through the influence of mining technology on the stability of coal wall, the paper analyzes the adaptability of the hydraulic support with large mining height to the speed of working face, the arrangement of trench, the depth of mining, and puts forward the control measures of sheet cover based on different mining technology. Based on the analysis of interference variables and FLAC3D simulation to determine the best length of coal wall in thick coal seam, the main parameters of hydraulic support caving mechanism with large mining height are determined, and an improved scheme is put forward, which is based on coal wall protection to realize slab control. By studying the mechanism of thick coal seam, this paper determines the best supporting strength, optimizes its roof support ability, and reduces the load of coal body. According to the relation between the mining technology of high mining height and the influence of coal wall blade cover, the adaptability analysis of large mining height hydraulic support is carried out, and the ability of preventing sheet cover under different mining technology is optimized. According to the characteristics of stress variation of coal body, the design and size requirements of key components such as bevel plate are put forward. The research in this paper is helpful to improve the ability of preventing flake cover of hydraulic support with large mining height and has a certain guiding effect on production site.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD355.4

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