综放软围岩混凝土自锁实体墙沿空留巷技术研究

发布时间：2018-05-01 00:31

本文选题：沿空留巷 + 可控关键带　；参考：《山东科技大学》2017年硕士论文

【摘要】：本论文以石泉煤矿30105工作面实际地质条件为依据,采用理论分析、室内实验结合数值模拟的方法,对沿空留巷覆岩运动和结构演化规律、留巷围岩受力情况、自锁实体墙结构设计和稳定性以及巷旁支护体结构参数对留巷稳定性的影响进行了系统分析,得出的主要结论如下:(1)根据沿空留巷覆岩运动规律及覆岩“大、小结构”理论,系统分析了沿空留巷顶板应力传递机制,提出了留巷围岩“可控关键带”理论,“可控关键带”是由巷旁支护体、实体煤帮、巷道顶底板通过巷内、巷旁支护共同组成留巷稳定维护系统,通过对各部位的合理控制,可有效保证沿空留巷的稳定性。(2)分别对留巷围岩各支护结构构建了力学模型,并对其进行受力分析,本文将具有不同刚度的巷旁支护体、直接顶、底板看作巷旁支护系统,构建了巷旁支护系统力学模型,分析了巷旁支护系统总变形量S与系统刚度k的关系以及各分部刚度对巷旁支护系统变形的影响。(3)采用相似材料模拟实验对综放沿空留巷在不同影响阶段时巷道围岩的应力及变形规律进行了研究,两次采动超前支承压力都对巷道围岩变形产生较大影响且二次采动对留巷围岩稳定性影响更严重,留巷后工作面倾斜方向残余支承压力会对墙体倾斜方向的稳定性产生较大影响。(4)基于对现有巷旁支护体优缺点的详细分析,设计了混凝土预制块自锁实体墙,通过solidworks三维模拟软件详细模拟了墙体砌块结构及其砌块排列方式,并通过FLAC3D数值模拟软件对自锁实体墙稳定性进行模拟分析,得出自锁实体墙稳定性优于普通组装墙。(5)采用FLAC3D数值模拟软件,模拟分析留巷围岩稳定性随工作面推进的动态变化规律,全面分析了巷旁支护体的强度、宽度及其结构对留巷围岩稳定性的影响。研究结果表明,巷旁支护体强度、宽度越大,留巷围岩越稳定,但存在成本高,进度慢等缺点,从安全与经济的角度综合确定了巷旁支护体强度与宽度;接顶让压材料具有保证墙体整体强度的同时,又使巷旁支护体具有适当的可变形性,更有利于巷旁支护墙体的稳定。
[Abstract]:Based on the actual geological conditions of 30105 working face in Shi Quan Coal Mine, this paper adopts theoretical analysis, laboratory experiment and numerical simulation method to analyze the law of overburden rock movement and structure evolution along goaf roadway, and to analyze the stress of surrounding rock in retaining roadway. The structural design and stability of self-locking solid wall and the influence of structural parameters of roadway brace on the stability of retaining roadway are systematically analyzed. The main conclusions are as follows: 1) according to the law of overburden movement along gob and the theory of "large and small structure" of overburden rock, The stress transfer mechanism of roof along goaf is analyzed systematically, and the theory of "controllable critical zone" of surrounding rock is put forward. The theory of "controllable critical zone" is composed of side support of roadway, solid coal side, roof and floor of roadway passing through roadway. The stability maintenance system of retaining roadway is composed of roadway side support. Through reasonable control of each part, the stability of roadway along goaf can be effectively guaranteed. The mechanical model of each supporting structure in surrounding rock of retaining roadway is constructed respectively, and the mechanical analysis is carried out on it. In this paper, the roadway side support body with different stiffness is regarded as the roadway side support system, and the mechanical model of the roadway side support system is constructed. The relationship between the total deformation of roadway side support system S and the system stiffness k and the influence of each segment stiffness on the deformation of roadway side support system are analyzed. The similar material simulation experiment is used to simulate the roadway in different stages of influence on the roadway along the gob of fully mechanized caving. The stress and deformation of surrounding rock are studied. The second mining advance bearing pressure has a great influence on the surrounding rock deformation of roadway, and the secondary mining has more serious influence on the stability of retaining roadway surrounding rock. The residual supporting pressure in the inclined direction of the working face behind the roadway will have a great influence on the stability of the inclined direction of the wall. (4) based on the detailed analysis of the advantages and disadvantages of the existing roadway side support support, a concrete precast self-locking solid wall is designed. The wall block structure and its arrangement are simulated in detail by solidworks software, and the stability of self-locking solid wall is simulated and analyzed by FLAC3D numerical simulation software. It is concluded that the stability of self-locking solid wall is superior to that of the ordinary assembled wall. The stability of retaining roadway surrounding rock is simulated by FLAC3D software, and the dynamic variation law of surrounding rock stability with the advance of working face is analyzed, and the strength of retaining body by roadway side is analyzed comprehensively. The influence of width and structure on the stability of surrounding rock. The results show that the strength and width of side support are more stable, but the cost is high and the progress is slow. The strength and width of side support are determined comprehensively from the point of view of safety and economy. The compaction material of connecting roof can guarantee the whole strength of wall, at the same time, it can make the retaining body of roadway side have proper deformability, which is more beneficial to the stability of wall of roadway side support.
【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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