深部矿井不同采深煤与瓦斯突出实验与数值模拟研究

发布时间：2018-06-14 23:52

本文选题：煤与瓦斯突出 + 深部开采　；参考：《辽宁工程技术大学》2013年硕士论文

【摘要】：煤与瓦斯突出是指在压力作用下，破碎的煤与瓦斯由煤体内突然向采掘空间大量喷出，是一种具有极其复杂动力现象的工程地质灾害。随着井下煤层开采深度的逐渐增加，深部采场地应力、瓦斯压力、温度逐渐升高，煤体力学特性与浅部也将存在较大差异。因此，深入开展煤与瓦斯突出模拟实验及数值计算的研究，对防治深部开采煤与瓦斯突出灾害，保证煤矿安全生产具有重要的理论与实践意义。本文采用以试验研究为主，数值模拟和理论分析为辅的研究方法。首先以典型高瓦斯矿井辽宁阜新孙家湾煤矿太上层为研究对象，利用自主研发的煤与瓦斯突出模拟实验装置，首次进行了主动突出模拟实验研究。模拟了煤层开采深度分别为900m、1100m、1300m时发生煤与瓦斯突出全过程。利用轴压、围压模拟地应力作用，孔隙压模拟瓦斯压力作用。经相似理论计算预设了三种开采深度下轴压和围压值，孔隙压逐级增加得到了突出临界瓦斯压力、突出强度、突出距离等突出参数。试验再现了煤与瓦斯突出孔洞口小腔大、突出煤粉分布具有分选性等突出特征现象，验证了煤与瓦斯突出模拟仪的可靠性。基于试验结果，，重点分析了突出后各区域煤粒径分布、质量分布、分选性等规律，与前人结果吻合性较好。继而利用实验结果反演现场突出有效应力值，理论推导得到煤与瓦斯突出能量，与现场实测值基本相符。最后，建立了THM耦合数值模型，模拟得到了深部采场不同煤层深度、温度条件下的煤层瓦斯压力、瓦斯渗流速度、有效应力、体积应变、孔隙率和渗透率的变化规律。研究结论可为该矿煤与瓦斯突出的防治提供参考。
[Abstract]:Coal and gas outburst is a kind of engineering geological disaster with extremely complex dynamic phenomena, which means that the broken coal and gas are ejected suddenly from the coal body into the excavating space under the action of pressure. With the increase of mining depth in underground coal seam, the stress, gas pressure and temperature of deep coal mining site will gradually increase, and the mechanical characteristics of coal body will also be different from that of shallow coal seam. Therefore, it is of great theoretical and practical significance to carry out the simulation experiment and numerical calculation of coal and gas outburst to prevent and control coal and gas outburst disasters in deep mining and to ensure the safety of coal mine production. In this paper, the experimental research method is adopted, which is supplemented by numerical simulation and theoretical analysis. Firstly, taking the upper layer of Sunjiawan Coal Mine in Fuxin, Liaoning Province, as the research object, the active outburst simulation experiment was carried out for the first time by using the self-developed simulation experimental device of coal and gas outburst. The whole process of coal and gas outburst is simulated when the mining depth of coal seam is 900m ~ 1100m ~ 1300m respectively. Axial pressure, confining pressure and pore pressure are used to simulate ground stress and gas pressure respectively. The axial pressure and confining pressure under three mining depths are calculated by similarity theory, and the outburst critical gas pressure, outburst strength, outburst distance and other outburst parameters are obtained by increasing pore pressure step by step. The experimental results show that the coal and gas outburst with small cavity is large and the coal powder distribution has the characteristics of separation. The reliability of the coal and gas outburst simulator is verified. Based on the experimental results, the distribution of coal particle size, mass distribution and separation of coal in different regions after outburst are analyzed, and the results are in good agreement with the previous results. Then the effective stress value of field outburst is retrieved from the experimental results, and the energy of coal and gas outburst is derived theoretically, which is basically consistent with the field measured value. Finally, a THM coupled numerical model is established to simulate the variation of coal seam gas pressure, gas seepage velocity, effective stress, volume strain, porosity and permeability under different coal seam depths and temperatures in deep stope. The results can provide reference for the prevention and treatment of coal and gas outburst in this mine.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD713

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