回撤通道围岩变形破坏机理及其控制技术研究

发布时间：2018-03-18 19:31

本文选题：综采工作面　切入点：回撤通道　出处：《西安科技大学》2017年博士论文　论文类型：学位论文

【摘要】：在综采工作面末采阶段,回撤通道受采动影响剧烈易发生围岩大变形而造成压架事故,严重影响工作面的搬家回撤效率。本文以神南矿区综采工作面回撤通道为工程背景,采用现场实测、理论分析、数值模拟和工业性试验相结合的综合研究方法,以回撤通道与工作面贯通后的老顶破坏形式为出发点,研究了回撤通道围岩变形破坏机理和应力分布规律,并提出回撤通道围岩变形控制方法,主要取得了以下成果:(1)在神南矿区各煤层综采工作面回撤通道现场监测的基础上,对不同煤层工作面回撤通道围岩在时间和空间上变形破坏规律进行研究,发现回撤通道围岩变形量和破坏范围远大于其他回采巷道,并且不同煤层工作面回撤通道之间的围岩变形量和破坏范围差异较大。(2)根据工作面与回撤通道贯通后的老顶断裂位置,采用不同的力学模型分别推导了不同老顶破坏形式的顶板下沉量计算公式,分析老顶断裂位置、工作面采煤条件、支护强度、巷道断面尺寸等因素对回撤通道顶板下沉量的影响,并结合现场实测数据进行对比分析;分别采用压杆理论和极限平衡理论分析了回撤通道实体煤帮部破坏形式与塑性区范围,通过上述为回撤通道围岩控制和支护设计研究提供理论依据。(3)通过现场实测和数值模拟对工作面末采阶段回撤通道的应力演化过程进行了研究,并采用理论方法研究工作面贯通后老顶在不同断裂位置时的回撤通道围岩应力的分布规律,推导了单回撤通道外侧实体煤和双回撤通道保护煤柱的垂直应力计算公式;通过将现场应力实测数据与理论公式进行反馈分析,确定了神南矿区各煤层工作面贯通后的老顶断裂位置,为回撤通道围岩控制方法提供依据。(4)在回撤通道围岩变形破坏机理和应力演化规律研究的基础上,讨论了回撤通道布置方式,提出双回撤通道保护煤柱留设宽度的计算方法,并对采高控制、停采让压和强制放顶3种矿压控制措施进行了分析,研究了采高对顶板结构和老顶断裂位置的影响规律、停采让压位置以及强制放顶的适用条件,在此基础上确定了末采阶段回撤通道矿压控制技术措施。(5)分析了回撤通道内垛式支架和锚杆(索)支护的作用机理,并提出了回撤通道的支护参数设计方法,将研究成果应用于红柳林煤矿15206工作面回撤通道,在采取矿压控制措施的基础上对原支护方案进行优化,实现了工作面与回撤通道的无来压贯通,确保了该工作面的安全、快速回撤。
[Abstract]:In the final mining stage of fully mechanized coal mining face, it is easy to take place the large deformation of surrounding rock under the influence of mining movement, which results in the pressure frame accident, which seriously affects the moving and withdrawing efficiency of the working face. This paper takes the withdrawal passage of the fully mechanized mining face in Shennan Mining area as the engineering background. Using the method of field measurement, theoretical analysis, numerical simulation and industrial test, taking the failure form of the main roof after the passage of withdrawal and the working face through as the starting point, The deformation and failure mechanism and stress distribution of surrounding rock of withdrawal passage are studied, and the control method of surrounding rock deformation of retreat passage is put forward. The following results are obtained mainly: 1) on the basis of on-site monitoring of withdrawal passage of fully mechanized coal face in Shennan mining area, Based on the study of time and space deformation and failure law of surrounding rock of withdrawal passage in different coal seam face, it is found that the deformation and damage range of surrounding rock of withdrawal passage is much larger than that of other mining roadways. The deformation and failure range of surrounding rock between different coal face retreating channels are different greatly. (2) according to the main roof fracture position after connecting the coal face and the retreating passage, In this paper, different mechanical models are used to deduce the calculation formulas of roof subsidence in different failure forms of main roof, and the fracture position of main roof, coal mining condition of working face, and support strength are analyzed. The influence of roadway cross section size on the roof subsidence of the retreating passage is compared and analyzed in combination with the field measured data, and the failure form and plastic zone range of the solid coal roof of the retreating passage are analyzed by the theory of pressure bar and the limit equilibrium theory, respectively. The stress evolution process of the withdrawal tunnel in the final mining stage is studied through the field measurement and numerical simulation, which provides a theoretical basis for the study of the surrounding rock control and support design of the retreating tunnel. The distribution law of surrounding rock stress of the main roof in different fault positions after the working face is through is studied, and the formulas for calculating the vertical stress of the solid coal outside the single retreat passage and the coal pillar protected by the double return passage are derived. Through the feedback analysis of the field stress measured data and the theoretical formula, the position of the main roof fracture after the coal face is through in Shennan mining area is determined. On the basis of studying the deformation and failure mechanism and stress evolution law of surrounding rock, this paper discusses the layout of withdrawal passage, and puts forward a calculation method for protecting the width of coal pillar in double retreat channel. The control measures of mining height, stop-mining pressure and forced caving are analyzed. The influence of mining height on roof structure and main roof fracture position, stop-and-take pressure position and the suitable conditions of forced caving are studied. On the basis of this, the paper determines the technical measures of mine pressure control in the retreating passage at the end mining stage. It analyzes the action mechanism of the stacking support and the bolting (cable) support in the retreating passage, and puts forward the design method of the supporting parameters of the retreating passage. Applying the research results to the retreating passage of 15206 working face in Yu Hong Liulin Coal Mine, the original support scheme is optimized on the basis of adopting the control measures of mine pressure, which realizes the no pressure breakthrough between the working face and the retreat passage, and ensures the safety of the working face. Pull back quickly.
【学位授予单位】：西安科技大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TD353;TD322

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