本文選題：沿空掘巷 + 瓦斯參數(shù)　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：梁北煤礦具有開采深度大、煤層松軟、煤層厚度大、瓦斯含量高等特點,其11131工作面為孤島工作面,順槽巷道采用沿空掘巷。沿空掘巷期間如何采取綜合防突措施,特別是是否需要采取區(qū)域防治措施,取決于沿空煤體內(nèi)應(yīng)力和瓦斯參數(shù)大小及其分布情況。本文采用理論分析、數(shù)值模擬和現(xiàn)場測試驗證相結(jié)合的方法,對11131工作面沿空掘進巷道掘進前后應(yīng)力和瓦斯參數(shù)分布規(guī)律進行研究。1)在沿空巷道掘巷前對沿空煤體瓦斯含量進行了測試,利用朗格繆爾公式計算出瓦斯壓力,并分析了兩者的分布規(guī)律,研究表明:距巷幫18m范圍內(nèi),沿空煤體瓦斯含量小于6m3/t,瓦斯壓力小于0.5MPa;沿空巷道掘巷后對實體煤內(nèi)鉆屑量、鉆屑瓦斯解吸指標、瓦斯含量等參數(shù)進行了現(xiàn)場測試,分析了其分布規(guī)律,結(jié)果表明:巷幫20m范圍內(nèi)煤體的瓦斯參數(shù)基本上隨深度逐漸增大,但未達到或超過防突預(yù)測臨界值。2)在沿空巷道實體煤內(nèi)安裝應(yīng)力監(jiān)測傳感器,對采動應(yīng)力進行了實時監(jiān)測,并分析了采動應(yīng)力隨時間和距掘進迎頭距離變化趨勢,結(jié)果表明煤體內(nèi)部高應(yīng)力區(qū)位于距巷幫15m以里的區(qū)域內(nèi),且機巷煤體整體應(yīng)力大于風巷;借助FLAC-3D軟件,建立11131孤島工作面三維數(shù)值計算模型,研究了沿空掘巷前后煤體的應(yīng)力分布特征及變化規(guī)律,對沿空煤體內(nèi)應(yīng)力分布規(guī)律進行了數(shù)值模擬,研究表明:實測應(yīng)力變化趨勢與數(shù)值模擬吻合,即距巷幫15m范圍內(nèi),垂直應(yīng)力不斷增大。3)對沿空煤體瓦斯參數(shù)與實測應(yīng)力間的相關(guān)性進行了研究,結(jié)果表明:沿空煤體內(nèi)瓦斯參數(shù)變化趨勢和應(yīng)力呈正相關(guān),這與理論分析一致。4)根據(jù)沿空煤體不同位置的瓦斯參數(shù)及應(yīng)力分布規(guī)律,分析了巷道內(nèi)不同區(qū)域沿空煤體卸壓范圍、瓦斯排放效果及沿空掘巷煤體的穩(wěn)定性和安全性,結(jié)果表明:沿空巷道實體煤側(cè)15m范圍內(nèi)應(yīng)力和瓦斯參數(shù)大小及其分布情況符合《防治煤與瓦斯突出規(guī)定》。研究結(jié)果揭示沿空煤體應(yīng)力和瓦斯參數(shù)分布規(guī)律,為后續(xù)沿空掘巷順利進行提供理論依據(jù),同時還能為類似工程提供參考。
[Abstract]:Liangbei coal mine is characterized by large mining depth, soft coal seam, large thickness of coal seam and high gas content. The 11131 face is an island working face, and the roadway along the channel is driven along the goaf. How to take comprehensive measures to prevent outburst during gob excavation, especially whether it is necessary to take regional prevention measures, depends on the size and distribution of stress and gas parameters along goaf coal body. In this paper, theoretical analysis, numerical simulation and field test verification are combined. This paper studies the distribution of stress and gas parameters before and after driving along goaf roadway in 11131 face. 1) the gas content of coal body along goaf is measured before driving roadway along goaf, and the gas pressure is calculated by Langmuir formula. The results show that the gas content of goaf coal is less than 6m3 / t, the gas pressure is less than 0.5MPa, the amount of debris drilling in solid coal is less than 0.5MPa, and the gas desorption index of coal is obtained after digging roadway along the goaf, and the results show that the gas content of coal along goaf is less than 6 m ~ 3 / t and the gas pressure is less than 0.5 MPA. The gas content and other parameters are tested on the spot, and the distribution law is analyzed. The results show that the gas parameters of coal body increase gradually with the depth of the roadway side in the range of 20m. However, the critical value of outburst prevention prediction is not reached or exceeded (.2) the stress monitoring sensor is installed in the solid coal along the goaf to monitor the mining stress in real time, and the trend of the change of the mining stress with time and the head-on distance from the tunneling is analyzed. The results show that the high stress area of coal body is located in the area 15m from the side of roadway, and the overall stress of coal body in machine roadway is greater than that of wind roadway, and the 3D numerical calculation model of 11131 islanding face is established with the help of FLAC-3D software. The stress distribution characteristics and variation law of coal body before and after goaf excavation are studied, and the stress distribution law of coal body along goaf is numerically simulated. The results show that the change trend of measured stress is consistent with that of numerical simulation, that is, within 15 m from the side of roadway, The correlation between the gas parameters along the goaf and the measured stress is studied. The results show that the variation trend of gas parameters along the goaf is positively correlated with the stress. This is consistent with the theoretical analysis .4) according to the gas parameters and stress distribution law of different positions along the goaf coal body, the pressure relief range, the gas drainage effect and the stability and safety of the coal body along the goaf roadway in different areas of the roadway are analyzed. The results show that the stress and gas parameter size and their distribution in the coal side of the goaf meet the regulation of preventing coal and gas outburst. The results reveal the distribution of stress and gas parameters along the goaf, which provides a theoretical basis for the smooth roadway driving along the goaf, and also provides a reference for similar projects.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712

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