本文選題：綜采工作面　切入點：回撤通道　出處：《西安科技大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：在綜采工作面末采階段,回撤通道受采動影響劇烈易發(fā)生圍巖大變形而造成壓架事故,嚴重影響工作面的搬家回撤效率。本文以神南礦區(qū)綜采工作面回撤通道為工程背景,采用現(xiàn)場實測、理論分析、數(shù)值模擬和工業(yè)性試驗相結(jié)合的綜合研究方法,以回撤通道與工作面貫通后的老頂破壞形式為出發(fā)點,研究了回撤通道圍巖變形破壞機理和應(yīng)力分布規(guī)律,并提出回撤通道圍巖變形控制方法,主要取得了以下成果:(1)在神南礦區(qū)各煤層綜采工作面回撤通道現(xiàn)場監(jiān)測的基礎(chǔ)上,對不同煤層工作面回撤通道圍巖在時間和空間上變形破壞規(guī)律進行研究,發(fā)現(xiàn)回撤通道圍巖變形量和破壞范圍遠大于其他回采巷道,并且不同煤層工作面回撤通道之間的圍巖變形量和破壞范圍差異較大。(2)根據(jù)工作面與回撤通道貫通后的老頂斷裂位置,采用不同的力學(xué)模型分別推導(dǎo)了不同老頂破壞形式的頂板下沉量計算公式,分析老頂斷裂位置、工作面采煤條件、支護強度、巷道斷面尺寸等因素對回撤通道頂板下沉量的影響,并結(jié)合現(xiàn)場實測數(shù)據(jù)進行對比分析;分別采用壓桿理論和極限平衡理論分析了回撤通道實體煤幫部破壞形式與塑性區(qū)范圍,通過上述為回撤通道圍巖控制和支護設(shè)計研究提供理論依據(jù)。(3)通過現(xiàn)場實測和數(shù)值模擬對工作面末采階段回撤通道的應(yīng)力演化過程進行了研究,并采用理論方法研究工作面貫通后老頂在不同斷裂位置時的回撤通道圍巖應(yīng)力的分布規(guī)律,推導(dǎo)了單回撤通道外側(cè)實體煤和雙回撤通道保護煤柱的垂直應(yīng)力計算公式;通過將現(xiàn)場應(yīng)力實測數(shù)據(jù)與理論公式進行反饋分析,確定了神南礦區(qū)各煤層工作面貫通后的老頂斷裂位置,為回撤通道圍巖控制方法提供依據(jù)。(4)在回撤通道圍巖變形破壞機理和應(yīng)力演化規(guī)律研究的基礎(chǔ)上,討論了回撤通道布置方式,提出雙回撤通道保護煤柱留設(shè)寬度的計算方法,并對采高控制、停采讓壓和強制放頂3種礦壓控制措施進行了分析,研究了采高對頂板結(jié)構(gòu)和老頂斷裂位置的影響規(guī)律、停采讓壓位置以及強制放頂?shù)倪m用條件,在此基礎(chǔ)上確定了末采階段回撤通道礦壓控制技術(shù)措施。(5)分析了回撤通道內(nèi)垛式支架和錨桿(索)支護的作用機理,并提出了回撤通道的支護參數(shù)設(shè)計方法,將研究成果應(yīng)用于紅柳林煤礦15206工作面回撤通道,在采取礦壓控制措施的基礎(chǔ)上對原支護方案進行優(yōu)化,實現(xiàn)了工作面與回撤通道的無來壓貫通,確保了該工作面的安全、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.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TD353;TD322

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