發(fā)布時(shí)間：2018-02-12 02:41

  本文關(guān)鍵詞： 封孔裝置 瓦斯抽采 密封性 帶壓封孔　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：打鉆預(yù)埋管抽采是我國(guó)煤礦瓦斯治理的主要技術(shù)方法之一,但當(dāng)前瓦斯抽采鉆孔封孔質(zhì)量差,導(dǎo)致鉆孔抽采瓦斯?jié)舛鹊?鉆孔有效工作時(shí)間短。為了能夠提高鉆孔封孔質(zhì)量,研制了一體化封孔裝置并對(duì)其封孔參數(shù)進(jìn)行研究。 首先,本文對(duì)煤礦井下鉆孔圍巖應(yīng)力分布情況進(jìn)行了理論分析,并結(jié)合數(shù)值模擬軟件Flac3d模擬了鉆孔圍巖應(yīng)力分布情況,得出從鉆孔徑向向外可以劃分四個(gè)區(qū)域：破碎區(qū)、塑性區(qū)、彈性區(qū)和原巖應(yīng)力區(qū),其中破碎區(qū)對(duì)鉆孔密封有重要的影響。 其次,在分析鉆孔封孔最佳深度的基礎(chǔ)上,利用Flac3d模擬采動(dòng)影響下煤(巖)體中最佳封孔深度,得出煤層順層鉆孔中,封孔深度為距離巷壁平行工作面處10-27m,穿層鉆孔封孔深度為距底抽巷巷頂距離11-19m。 第三,依據(jù)對(duì)鉆孔裂隙進(jìn)行密封的要求,一體化封孔裝置采用的是帶壓封孔,其目的是促使?jié){液擴(kuò)散進(jìn)入破碎區(qū),固化破碎區(qū)煤巖體達(dá)到提高密封性的目的。采用UDEC軟件模擬不同鉆孔注漿壓力條件下,其漿液在煤巖體中的擴(kuò)散范圍大小,選擇擴(kuò)散范圍最大的注漿壓力作為鉆孔最佳的注漿壓力,得出煤層鉆孔注漿壓力為0.6Mpa,巖層鉆孔注漿壓力為1.4Mpa。 最后,由理論結(jié)合數(shù)值模擬得出的一體化封孔裝置的封孔參數(shù)后,進(jìn)行了煤礦現(xiàn)場(chǎng)試驗(yàn)考察,得出了相比于傳統(tǒng)的封孔技術(shù),該封孔裝置具有一定的優(yōu)勢(shì)。但該封孔裝置的應(yīng)用效果在不同試驗(yàn)地點(diǎn)又有不同的抽采效果,通過(guò)這一現(xiàn)象,分析了抽采點(diǎn)的地質(zhì)情況,發(fā)現(xiàn)封孔裝置的應(yīng)用效果受地質(zhì)影響較大。從總體情況看,該封孔裝置封孔效果較好。
[Abstract]:Drilling and pre-burying pipe drainage is one of the main technical methods for gas control in coal mines in China. However, the quality of sealing holes in gas extraction holes is poor at present, which results in low gas concentration and short effective working time of boreholes. An integrated sealing device was developed and its sealing parameters were studied. Firstly, the stress distribution of borehole surrounding rock is analyzed theoretically in this paper. Combined with numerical simulation software Flac3d, the stress distribution of borehole surrounding rock is simulated. It is concluded that four regions can be divided from borehole radial to outer: broken area. Plastic zone, elastic zone and original rock stress zone, in which broken zone has important influence on borehole sealing. Secondly, on the basis of analyzing the optimum depth of borehole sealing, Flac3d is used to simulate the optimum depth of hole sealing in coal (rock) body under the influence of mining, and the results show that, The depth of sealing hole is 10 ~ (-27) m from the parallel face of roadway wall, and the depth of hole sealing is 11-19 m from the top of bottom drawing roadway. Thirdly, according to the requirement of sealing the borehole fissure, the integrated sealing device adopts the pressured hole sealing device, which aims to promote the slurry diffusion into the broken area. In order to improve the sealability of coal and rock mass in solidified and broken area, UDEC software is used to simulate the diffusive range of slurry in coal and rock mass under different grouting pressure. When the grouting pressure with the largest diffusion range is chosen as the best grouting pressure for drilling, it is concluded that the grouting pressure of coal seam drilling is 0.6 Mpaand that of rock stratum is 1.4 Mpa. Finally, after the hole sealing parameters of the integrated sealing device obtained by theoretical and numerical simulation, the field test investigation of coal mine was carried out, and compared with the traditional sealing technology, This sealing device has some advantages, but the application effect of the sealing device has different extraction effect in different test sites. Through this phenomenon, the geological situation of pumping point is analyzed. It is found that the application effect of the sealing device is greatly affected by geology, and from the overall situation, the sealing effect of the sealing device is better.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD712.6

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本文編號(hào)：1504597