【摘要】：隨著開(kāi)采強(qiáng)度的加大,巷道受到的應(yīng)力擾動(dòng)越來(lái)越頻繁。對(duì)于跨采動(dòng)壓巷道,影響其圍巖穩(wěn)定性的因素很多,巷道的圍巖控制一直是煤礦安全生產(chǎn)的難題,當(dāng)上覆煤層工作面走向與下部底板巷道走向一致時(shí),底板巷道圍巖應(yīng)力更加復(fù)雜,巷道受動(dòng)壓影響更加強(qiáng)烈,其變形具有破壞速度快,破壞嚴(yán)重,破壞區(qū)域大的特點(diǎn),巷道圍巖控制難度進(jìn)一步加大。本文以井東礦4402工作面跨采底板9煤大巷為背景,首先通過(guò)現(xiàn)場(chǎng)監(jiān)測(cè)得到了4煤頂板來(lái)壓規(guī)律并分析了4煤礦壓顯現(xiàn)強(qiáng)烈程度;其次通過(guò)理論分析、數(shù)值模擬等方法、深入研究了工作面底板破壞深度、破壞影響因素以及底板應(yīng)力傳播規(guī)律。通過(guò)數(shù)值模擬,研究了上覆煤層采動(dòng)作用下底板巷道圍巖應(yīng)力、圍巖變形以及塑性區(qū)的變化規(guī)律;分析了巷道穩(wěn)定性空間影響因素,得出了跨采底板巷道圍巖穩(wěn)定性與垂距和水平距離的關(guān)系。對(duì)9煤底板大巷當(dāng)前支護(hù)進(jìn)行了分析,闡述了上覆煤層采動(dòng)作用下巷道失穩(wěn)機(jī)理;基于不等強(qiáng)讓壓支護(hù)原理,根據(jù)騎跨采特點(diǎn)提出了組合動(dòng)態(tài)加固方案,對(duì)9煤底板大巷采動(dòng)影響區(qū)域進(jìn)行了劃分,并針對(duì)不同區(qū)域給出了二次支護(hù)結(jié)構(gòu)形式和具體施工工藝。設(shè)計(jì)了相應(yīng)的現(xiàn)場(chǎng)觀(guān)測(cè)研究方案,得到了上方煤層工作面采動(dòng)作用下巷道的表面位移、頂板離層變化規(guī)律。監(jiān)測(cè)結(jié)果表明,巷道圍巖變形與頂板離層較小,均在可控范圍之內(nèi),表明該方案有效的控制了圍巖的變形、保證了生產(chǎn)的正常運(yùn)行。
[Abstract]:With the increase of mining intensity, the stress disturbance of roadway is more and more frequent. There are many factors that affect the stability of the surrounding rock in the cross mining dynamic pressure roadway. The surrounding rock control of the roadway is always a difficult problem in the safe production of coal mine. When the working face of overlying coal seam is in line with that of the roadway under the floor, The surrounding rock stress of floor roadway is more complex, and the influence of dynamic pressure on roadway is more intense. The deformation of roadway is characterized by fast failure speed, serious damage and large damage area, which makes it more difficult to control the surrounding rock of roadway. In this paper, based on the background of coal roadway No. 9 in 4402 face of Jingdong Coal Mine, the law of roof pressure of No. 4 coal mine is obtained by field monitoring, and the intensity of pressure behavior of coal mine is analyzed, and then, by means of theoretical analysis and numerical simulation, the pressure intensity of No. 4 coal mine is analyzed by means of theoretical analysis, numerical simulation and so on. In this paper, the failure depth, failure factors and stress propagation law of the working face floor are studied. Through numerical simulation, the variation law of surrounding rock stress, surrounding rock deformation and plastic zone of roadway under the roof of overlying coal seam is studied, and the spatial influence factors of roadway stability are analyzed. The relationship between the stability of surrounding rock and vertical distance and horizontal distance is obtained. This paper analyzes the current support of 9 coal floor roadway, expounds the mechanism of instability of the roadway used in the mining action of overlying coal seam, and puts forward the combined dynamic reinforcement scheme based on the principle of unequal strength pressure support and the characteristics of straddle mining. The area affected by mining movement of No. 9 coal floor roadway is divided, and the form of secondary support structure and concrete construction technology are given for different areas. The corresponding field observation and research scheme is designed, and the surface displacement and roof separation law of the roadway used in the mining action of the upper coal face are obtained. The monitoring results show that the deformation of roadway surrounding rock and roof layer are both within the controllable range, which indicates that the scheme can effectively control the deformation of surrounding rock and ensure the normal operation of production.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD322;TD353

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