本文選題：裂隙演化　切入點(diǎn)：相似模擬　出處：《西安科技大學(xué)》2017年碩士論文

【摘要】：采用高位鉆場(chǎng)抽采治理采空區(qū)瓦斯時(shí),將鉆孔布置在覆巖垮落的裂隙帶內(nèi)時(shí)抽采效果最佳。為了分析覆巖裂隙的演化規(guī)律,本文以新疆某礦井為地質(zhì)原型,結(jié)合覆巖裂隙演化和瓦斯抽采等相關(guān)理論,采用物理相似模擬實(shí)驗(yàn)和數(shù)值模擬實(shí)驗(yàn)對(duì)裂隙演化規(guī)律進(jìn)行分析,并將實(shí)驗(yàn)結(jié)果和現(xiàn)場(chǎng)測(cè)試結(jié)果對(duì)比分析,進(jìn)一步研究了覆巖裂隙時(shí)空演化規(guī)律在高位鉆孔抽采瓦斯中的應(yīng)用方法。以現(xiàn)有覆巖裂隙演化規(guī)律為基礎(chǔ),結(jié)合礦井地質(zhì)背景,設(shè)計(jì)并開(kāi)展物理相似模擬實(shí)驗(yàn),模擬了煤層在開(kāi)采過(guò)程中裂隙在走向和傾向上的演化規(guī)律。由實(shí)驗(yàn)結(jié)果分析可知每次周期來(lái)壓的裂隙發(fā)育特征以及巖層的垮落規(guī)律,覆巖“三帶”的高度中冒落帶高度為26m,裂隙帶高度為75.8m;引入分形理論,研究了覆巖裂隙網(wǎng)絡(luò)的分形特征,得出分形維數(shù)與開(kāi)采寬度、支承壓力峰值的關(guān)系,定量研究了走向傾向不同區(qū)域的裂隙演化與分布特征,并整體擬合出裂隙發(fā)育的橢拋帶區(qū)域;應(yīng)用fluent數(shù)值模擬軟件,結(jié)合相似模擬及分形理論所得出的裂隙分布規(guī)律,模擬高位鉆孔抽采前后采空區(qū)瓦斯?jié)舛茸兓闆r,以及抽采前后不同層位瓦斯?jié)舛葘?duì)比,結(jié)果表明,高位鉆孔抽采效果顯著,特別是回風(fēng)一側(cè)瓦斯?jié)舛却蠓档�。基于高位鉆孔抽采瓦斯機(jī)理以及覆巖裂隙高瓦斯?jié)舛葏^(qū)域的確定,以新疆某礦區(qū)現(xiàn)場(chǎng)實(shí)際情況及高位鉆孔抽采數(shù)據(jù)和效果為依據(jù),分析不同位置處抽采瓦斯體積分?jǐn)?shù)的變化規(guī)律,得出將高位鉆孔在采動(dòng)裂隙橢拋帶中抽采卸壓瓦斯是合理的,可以保證綜放工作面瓦斯?jié)舛炔怀蕖?br/>[Abstract]:In order to analyze the evolution law of overburden fractures, this paper takes a coal mine in Xinjiang as the geological prototype, when the borehole is arranged in the crack zone of overburden rock collapse, the extraction effect is the best when the gas in goaf area is controlled by high drilling ground. Combined with the related theories of overburden fracture evolution and gas drainage, the law of fracture evolution is analyzed by physical similarity simulation experiment and numerical simulation experiment, and the experimental results are compared with the field test results. The application method of space-time evolution law of overburden fracture in gas extraction by high hole drilling is further studied. Based on the existing evolution law of overburden fissure and combined with mine geological background, the physical similarity simulation experiment is designed and carried out. This paper simulates the evolution law of fracture strike and tendency in coal seam during mining. The analysis of experimental results shows the fracture development characteristics of each cycle pressure and the law of rock formation collapse. The height of falling zone is 26m and the height of fracture zone is 75.8m.The fractal characteristic of overburden fracture network is studied by introducing fractal theory, and the relationship between fractal dimension and mining width and peak value of supporting pressure is obtained. The characteristics of fracture evolution and distribution in different areas of strike tendency are quantitatively studied, and the elliptical zone of fracture development is fitted as a whole, and the distribution law of fracture is obtained by using fluent numerical simulation software, combining with similarity simulation and fractal theory. The gas concentration changes in the goaf before and after the extraction of the high hole and the comparison of the gas concentration in different strata before and after the extraction are simulated. The results show that the extraction effect of the high hole is remarkable. In particular, the gas concentration on the backwind side is greatly reduced. Based on the gas extraction mechanism of the high hole and the determination of the high gas concentration area in the overburden fissure, the actual situation of a mining area in Xinjiang and the data and effect of the high hole drainage are taken as the basis. By analyzing the variation law of gas volume fraction at different positions, it is concluded that it is reasonable to extract and discharge pressure gas in the elliptical parabolic zone of mining fissure, which can ensure that the concentration of gas in fully mechanized caving face is not over the limit.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD712

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