近浅埋煤层综放面沿空留巷顶板破断结构及巷旁支护机理

发布时间：2018-03-07 08:12

本文选题：近浅埋煤层　切入点：综放　出处：《山东科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：阿吾孜苏煤矿4#煤层为厚—特厚煤层,平均厚度8.22m,埋深约220m,煤层上方顶板岩性较软,但基岩层厚度较大,为近浅埋煤层。4#煤层工作面采用综放开采,运输平巷采用巷旁充填沿空留巷。为了保障沿空留巷围岩的稳定,需对沿空留巷顶板破断形态及巷旁充填体受力进行研究。因此,本文采用理论分析、相似材料模拟、数值计算和现场监测相结合的方法,对阿吾孜苏煤矿4#煤层综放工作面沿空留巷顶板破断结构及巷旁支护机理进行研究,获得的主要结论如下:(1)根据阿吾孜苏煤矿地质勘探资料及4#煤层顶板岩层物理力学参数,进行了近浅埋煤层综放面沿空留巷相似材料模拟,获得了 4#煤层开采时工作面侧向顶板破断演化过程及顶板(煤)的断裂位置与垮落角等。(2)通过UDEC数值模拟软件对近浅埋煤层综放面沿空留巷顶板运动规律及巷旁充填体应力变化进行了模拟。结果表面:沿空留巷顶板运动初期,巷旁充填体内压力增长较快,随着直接顶的垮落及采空区矸石对侧向直接顶的约束,巷旁充填体内压力增长速率逐渐放缓,在基本顶触矸并逐渐压实采空区矸石过程中,巷旁充填体内压力增加很少并逐渐趋于稳定。(3)在相似材料模拟和数值计算研究基础上,构建了近浅埋煤层综放面沿空留巷顶板破断结构演化模型,推导了综放面沿空留巷巷旁支护阻力的计算公式。(4)根据阿吾孜苏煤矿4-1101工作面生产地质条件及开采参数,计算了工作面回采过程中巷旁充填体所需提供的早期和长期支护阻力,并结合充填材料的可泵性确定了充填材料的最优配比,将充填材料应用于4-1101工作面运输平巷,并对巷道围岩变形量进行监测。结果表明:沿空留巷顶底板移近量最大为118mm,两帮移近量最大为131mm,围岩变形控制效果较好。
[Abstract]:The coal seam in Awusu coal mine is thick to very thick, with an average thickness of 8.22 m and a buried depth of about 220 m. The roof lithology of the coal seam is relatively soft, but the bedrock layer is relatively thick, so the coal face of near shallow coal seam. The coal seam is fully mechanized caving mining. In order to ensure the stability of the surrounding rock along the gob, it is necessary to study the broken form of roof and the force of the backfill beside the roadway. Therefore, the theoretical analysis and the simulation of similar materials are used in this paper. Combined with numerical calculation and field monitoring, the roof breaking structure and the mechanism of roadside support of top-coal caving face along goaf in Awuzisu coal mine are studied. The main conclusions obtained are as follows: (1) based on the geological exploration data of Awuzisu coal mine and the physical and mechanical parameters of the roof strata of the coal seam, the similar materials along the goaf of the fully mechanized caving face of the near shallow coal seam are simulated. The evolution process of lateral roof breaking in coal face, the fracture position and collapse angle of roof (coal), etc. (2) the movement law and roadway along the goaf of fully mechanized caving face in near shallow coal seam are obtained by UDEC numerical simulation software. The change of side filling stress was simulated. Results: the surface: at the beginning of the roof movement along the gob, The pressure of roadway side filling is increasing rapidly. With the collapse of the direct roof and the restriction of gangue on the side of the goaf, the pressure growth rate of the roadway side filling gradually slows down, and in the process of basically touching the gangue on the top and compacting the gangue in the goaf gradually, On the basis of similar material simulation and numerical calculation, an evolution model of roof breaking structure along goaf of fully mechanized caving face in shallow coal seam is established. Based on the production conditions and mining parameters of 4-1101 face in Awusu Coal Mine, the early and long-term support resistance required by roadway side filling in the process of mining is calculated. Combined with the pumpability of filling material, the optimum proportion of filling material is determined, and the filling material is applied to transport roadway of 4-1101 face. The results show that the maximum displacement of roof and floor along goaf is 118mm, the maximum of two-side is 131mm, and the control effect of surrounding rock deformation is better.
【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】：TD353

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