本文選題：賦水狀態(tài)　切入點(diǎn)：下向鉆孔　出處：《安徽理工大學(xué)》2014年碩士論文

【摘要】：隨著開(kāi)采深度的增加,地應(yīng)力、瓦斯含量與壓力不斷增高,礦井瓦斯涌出量和瓦斯災(zāi)害的威脅急劇增加,高瓦斯和煤與瓦斯突出礦井逐漸增多,如何采取有效措施實(shí)現(xiàn)安全高效開(kāi)采成為擺在采礦工作者面前的重要任務(wù)。特定條件下,煤層采前預(yù)抽也是一種有效的區(qū)域性預(yù)防突出的技術(shù)措施,它對(duì)煤層賦存條件的要求較低,施工容易,成本較低。 隨著煤礦范圍的擴(kuò)大、開(kāi)采深度的增加,瓦斯災(zāi)害日益加劇,由于受礦井采掘布置的影響,在礦井許多區(qū)域有必要采用下向鉆孔進(jìn)行瓦斯抽采,且顧北礦煤層頂?shù)装遒x水豐富,造成下向鉆孔施工困難,瓦斯抽采效果不好,因此,研究礦井高賦水條件下向長(zhǎng)鉆孔的成孔、護(hù)孔工藝、排水工藝、封孔工藝、抽采考察工藝等關(guān)鍵技術(shù),通過(guò)現(xiàn)場(chǎng)試驗(yàn)擬解決下向長(zhǎng)鉆孔抽采瓦斯的技術(shù)難點(diǎn),實(shí)現(xiàn)下向長(zhǎng)鉆孔抽采瓦斯并獲得很好的瓦斯抽采效果。 本次課題研究是在充分搜集顧北煤礦大量文獻(xiàn)資料基礎(chǔ)上,通過(guò)大量現(xiàn)場(chǎng)試驗(yàn)與實(shí)驗(yàn)室實(shí)驗(yàn),掌握了顧北煤礦4層瓦斯基礎(chǔ)參數(shù),得出顧北煤礦4層鉆孔瓦斯流量衰減系數(shù)在0.09248d-1～0.1009d-1范圍內(nèi)波動(dòng),平均鉆孔瓦斯流量衰減系數(shù)為0.09742d-1,透氣性系數(shù)為0.090358654m2/MPa2·d。依據(jù)瓦斯壓力降低法原理,通過(guò)長(zhǎng)期觀測(cè)不同距離測(cè)壓孔瓦斯壓力變化和經(jīng)過(guò)科學(xué)合理的測(cè)算可以得出顧北煤礦4層在連續(xù)抽采一個(gè)月時(shí)抽采半徑可以達(dá)到3m。所研制的下向鉆孔施工成套技術(shù)(下向孔成孔工藝、套管護(hù)孔、機(jī)械動(dòng)壓注漿法封孔、噴注漿防水及瓦斯抽采排水技術(shù)裝置),解決了煤層集中應(yīng)力對(duì)下向鉆孔垮孔、抽采封孔漏氣等問(wèn)題,滿(mǎn)足了試驗(yàn)區(qū)域下向長(zhǎng)孔層間含水條件下瓦斯抽采需要,提高了下向鉆孔抽采效果。
[Abstract]:With the increase of mining depth, the in-situ stress, gas content and pressure are increasing constantly, the mine gas emission and the threat of gas disaster are increasing sharply, and the high gas and coal and gas outburst mines are increasing gradually.How to take effective measures to realize safe and efficient mining has become an important task for miners.Pre-extraction before mining is also an effective regional technical measure to prevent outburst under specific conditions. It has lower requirements for coal seam occurrence conditions easy construction and low cost.With the expansion of coal mine scope and the increase of mining depth, the gas disaster is becoming more and more serious. Because of the influence of mining arrangement, it is necessary to use downward drilling hole for gas extraction in many areas of the mine, and the top and bottom slab of the coal seam in Gubei Mine is rich in water.As a result of the difficulty in the construction of downward drilling and the poor effect of gas extraction, this paper studies the key techniques such as hole formation, hole protection, drainage, sealing, extraction and investigation under the condition of high incidence of water in the mine, and so on.Through the field test, the technical difficulties of gas extraction from the downward long borehole are solved, the gas extraction from the downward long borehole is realized and the good gas drainage effect is obtained.On the basis of collecting a large number of documents in Gubei Coal Mine, the paper grasps the basic parameters of gas in four layers of Gubei Coal Mine through a lot of field tests and laboratory experiments.It is concluded that the attenuation coefficient of gas flow in four layers of Gubei Coal Mine fluctuates in the range of 0.09248d-1~0.1009d-1, the average attenuation coefficient of gas flow in borehole is 0.09742 d ~ (-1), and the permeability coefficient is 0.090358654m2/MPa2 d.According to the principle of gas pressure reduction method, through long-term observation of gas pressure changes in different distance pressure measuring holes and scientific and reasonable calculation, it is concluded that the drawing radius of the four layers of Gubei Coal Mine can reach 3 m after one month of continuous extraction.The whole set of down-hole construction technology (down-hole forming technology, casing protecting hole, mechanical dynamic grouting sealing, grouting waterproof and gas drainage and drainage) have been developed to solve the problem that the concentrated stress of coal seam can bring down hole to the down-hole.The problems such as gas leakage and so on are satisfied with the need of gas extraction under the condition of water cut in the bottom long hole layer in the test area, and the effect of the downward hole drainage is improved.
【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】：2014
【分類(lèi)號(hào)】：TD712.6

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