發(fā)布時(shí)間：2018-09-08 10:33

【摘要】：本文針對(duì)松軟底板低透煤層穿層鉆孔抽采瓦斯困難的問題,從鉆孔增透消突、圍巖預(yù)注漿、鉆孔密封和抽采參數(shù)優(yōu)化等方面進(jìn)行了理論研究和工程實(shí)踐。研究了鉆孔周圍煤體的應(yīng)力分布規(guī)律、滲透率變化規(guī)律和鉆孔預(yù)抽煤層瓦斯消突機(jī)理。實(shí)測(cè)了鶴煤十礦二1煤層原始瓦斯基礎(chǔ)參數(shù),建立瓦斯抽采氣固耦合模型,結(jié)合RFPA2D-Flow軟件模擬了穿層鉆孔抽采煤層瓦斯時(shí),不同抽采時(shí)間、鉆孔直徑和抽采負(fù)壓對(duì)鉆孔周圍煤體物理力學(xué)參數(shù)和瓦斯流動(dòng)情況的影響,確定了合理的瓦斯抽采參數(shù)。研究了賓漢體漿液的柱形擴(kuò)散理論,公式表明漿液擴(kuò)散距離與巖土層滲透率、注漿壓力、注漿時(shí)間及注漿管管徑成正比,與漿液濃度成反比,結(jié)合二1煤層底板情況給出了水灰比為0.7和1.0的水泥基漿液柱形擴(kuò)散時(shí)擴(kuò)散半徑與注漿壓力、注漿時(shí)間的三維坐標(biāo)圖,為現(xiàn)場(chǎng)松軟破碎底板圍巖預(yù)注漿和鉆孔帶壓注漿封孔提供理論依據(jù)。分析了鉆孔漏氣的形式和原因,建立了鉆孔漏氣模型,針對(duì)二1煤層底板松軟破碎的情況,應(yīng)采取圍巖注漿減少巖體裂隙、降低抽采負(fù)壓、增大鉆孔封孔長(zhǎng)度和使用小直徑高強(qiáng)度瓦斯抽采管等措施改善封孔效果,確定鉆孔封孔長(zhǎng)度必須大于11m�，F(xiàn)場(chǎng)實(shí)踐中,對(duì)瓦斯抽采鉆場(chǎng)周圍巖體進(jìn)行了帶壓預(yù)注漿封堵裂隙,實(shí)際注漿量比理論值高10.4%；采用PDC鉆、擴(kuò)單翼組合鉆頭對(duì)松軟低透煤層進(jìn)行掏穴擴(kuò)孔增透；鉆孔封孔時(shí)采用“兩堵一注”式帶壓注漿全程封孔工藝,并使用小直徑(1”)高強(qiáng)度PVC管用作孔內(nèi)抽采管�？疾炝算@孔瓦斯抽采濃度、流量和抽采影響半徑,多項(xiàng)技術(shù)措施的實(shí)施,達(dá)到了提高鉆孔抽放瓦斯效果的目的。
[Abstract]:Aiming at the difficult problem of gas extraction by drilling holes in soft floor low permeable coal seam, this paper has carried out theoretical research and engineering practice from the aspects of antireflection and outburst suppression, surrounding rock pre-grouting, borehole sealing and optimization of extraction parameters. The stress distribution, permeability change and gas outburst suppression mechanism of coal body around borehole are studied. The original gas foundation parameters of No. 2 coal seam in No. 2 coal seam of Hewan No. 10 Coal Mine were measured, and the gas extraction coupling model was established. Combined with the RFPA2D-Flow software, the different extraction time of coal seam gas was simulated when the coal seam was extracted by drilling through the stratum. The influence of borehole diameter and suction negative pressure on the physical and mechanical parameters of coal body and gas flow around the borehole has been determined and the reasonable gas drainage parameters have been determined. The cylindrical diffusion theory of Bingham slurry is studied. The formula shows that the diffusion distance of slurry is proportional to the permeability of rock and soil layer, grouting pressure, grouting time and the diameter of grouting pipe, and is inversely proportional to the concentration of slurry. Combined with the case of the floor of No. 1 coal seam, the three-dimensional coordinate diagrams of the diffusion radius, grouting pressure and grouting time of cement-based slurry columnar diffusion with water-cement ratio of 0.7 and 1.0 are given. It provides theoretical basis for pre-grouting and hole-sealing with pressure grouting on site soft broken floor surrounding rock. This paper analyzes on the form and cause of gas leakage in borehole, establishes the model of gas leakage in borehole, aiming at the soft breakage of floor of No. 1 coal seam, it is necessary to adopt surrounding rock grouting to reduce the crack of rock mass and to reduce the negative pressure of mining. The length of hole sealing must be greater than 11m by increasing the length of hole sealing and using small diameter and high strength gas drainage pipe to improve the effect of hole sealing. In the field practice, the rock mass around the gas drainage drilling yard is plugged by pre-grouting with pressure, and the actual grouting quantity is 10.4% higher than the theoretical value, the PDC drill is used to expand the single wing combination bit to increase the permeability of the soft and low permeable coal seam. The "two plugging and one injection" process with pressure grouting was adopted in the hole sealing process, and the small diameter (1 ") high strength PVC pipe was used as the pumping pipe in the hole. The concentration, flow rate and influence radius of borehole gas drainage, as well as the implementation of several technical measures, have been investigated in order to improve the effect of borehole gas drainage.
【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)：2230265