【摘要】：順層鉆孔抽采是煤礦瓦斯災(zāi)害防治的主要手段,其中鉆孔的封孔參數(shù)是決定瓦斯抽采效果的重要因素。為準(zhǔn)確地確定順層瓦斯抽采鉆孔的合理封孔參數(shù),本文基于王行莊煤礦12041工作面的地質(zhì)條件,分析了巷道圍巖的應(yīng)力分布特征與滲透率演化規(guī)律。在此基礎(chǔ)上,對順層瓦斯抽采鉆孔的合理封孔參數(shù)開展了模擬研究,并進(jìn)行了現(xiàn)場試驗驗證。取得了以下研究成果:(1)通過對王行莊煤礦二_1煤層頂?shù)装迕簬r樣進(jìn)行了物理力學(xué)性能參數(shù)的測試,運用FLAC3D軟件模擬了煤層巷道的開挖,結(jié)合現(xiàn)場鉆屑量法確定了12041工作面巷道的圍巖應(yīng)力分布,并對巷道開挖擾動后圍巖的煤體滲透率進(jìn)行計算。結(jié)果表明,巷道圍巖區(qū)域內(nèi)煤體滲透率最大值為初始滲透率的2290倍,最小值為初始滲透率的0.36倍。(2)利用Comsol Multiphysics結(jié)合雙重孔隙介質(zhì)瓦斯運移過程中的氣固耦合模型,對不同封孔深度與封孔長度的順層鉆孔抽采煤層瓦斯過程進(jìn)行了數(shù)值模擬分析。結(jié)果表明,順層瓦斯抽采鉆孔的封孔深度不宜超過應(yīng)力集中峰值點,超過應(yīng)力集中峰值點時,在巷道應(yīng)力集中峰值點處會形成一道屏障,阻隔峰值點兩側(cè)瓦斯的自由流動;順層瓦斯抽采鉆孔的合理封孔長度應(yīng)穿過巷道卸壓區(qū),到達(dá)應(yīng)力集中區(qū),略小于巷幫到應(yīng)力峰值點的距離。(3)使用Comsol Multiphysics軟件,對漿液在封孔段煤體內(nèi)的滲流擴(kuò)散過程進(jìn)行了模擬研究。結(jié)果表明,在相同的注漿時間內(nèi),增加注漿壓力可以明顯增加漿液滲透煤體的滲透率與漿液的擴(kuò)散半徑,漿液擴(kuò)散半徑的增加幅度隨著注漿壓力增加而慢慢變小;在相同的注漿壓力條件下,通過延長注漿時間可以增加漿液的擴(kuò)散半徑,但其增加幅度逐漸變緩,存在一個極值;順層瓦斯抽采鉆孔的合理注漿參數(shù)應(yīng)該是能夠滿足漿液完全封堵鉆孔周邊的煤體裂隙。(4)王行莊煤礦現(xiàn)場試驗結(jié)果表明,合理的封孔參數(shù)將會使鉆孔瓦斯的抽采濃度更高,衰減周期明顯延長。
[Abstract]:Borehole drainage is the main method to prevent and cure coal mine gas disaster, and the hole sealing parameter is an important factor to determine the effect of gas drainage. In order to determine the reasonable hole sealing parameters of gas drainage borehole, this paper analyzes the stress distribution characteristics and permeability evolution law of roadway surrounding rock based on the geological conditions of No. 12041 face in Wangxingzhuang Coal Mine. On this basis, the reasonable hole sealing parameters of the gas drainage borehole are simulated and verified by field test. The following research results have been obtained: (1) through the testing of the physical and mechanical properties of the coal samples from the roof and floor of No. 1 coal seam in Wangxingzhuang Coal Mine, the excavation of the roadway in the coal seam has been simulated by using FLAC3D software. The stress distribution of surrounding rock of 12041 face roadway is determined by the method of drilling debris quantity in the field, and the permeability of surrounding rock after excavation disturbance is calculated. The results show that the maximum permeability of coal is 2290 times of the initial permeability and the minimum is 0.36 times of the initial permeability in the surrounding rock area of roadway. (2) the gas-solid coupling model is used in the process of gas migration in Comsol Multiphysics combined with dual porosity medium. The process of coal seam gas extraction with different hole sealing depth and hole sealing length is analyzed numerically. The results show that the sealing depth of gas drainage borehole should not exceed the peak point of stress concentration. When the peak value of stress concentration is exceeded, a barrier will be formed at the peak point of stress concentration in roadway, which will block the free flow of gas on both sides of the peak point. The reasonable length of sealing hole should pass through the pressure relief area of roadway and reach the stress concentration area, which is a little less than the distance from the side of roadway to the stress peak point. (3) using Comsol Multiphysics software, The seepage and diffusion process of slurry in the sealing section of coal was simulated. The results show that in the same grouting time, increasing grouting pressure can obviously increase the permeability of slurry permeable coal and the diffusion radius of slurry, and the increasing range of slurry diffusion radius decreases with the increase of grouting pressure. Under the same grouting pressure condition, the diffusion radius of the slurry can be increased by prolonging the grouting time, but the increase range is gradually slowed down, and there is an extreme value. The reasonable grouting parameters should be satisfied with the complete sealing of coal fissure around the borehole by slurry. (4) the field test results of Wangxingzhuang coal mine show that reasonable sealing parameters will make the gas extraction concentration of borehole higher. The attenuation period is obviously prolonged.
【學(xué)位授予單位】：華北科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712.6

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本文編號：2181996