近距离煤层群采动煤岩渗透特性演化规律与实测方法研究

发布时间：2018-05-21 16:50

本文选题：采动裂隙场 + 近距离煤层群　；参考：《中国矿业大学（北京）》2013年博士论文

【摘要】：针对我国大部分矿区煤层具有渗透性低、透气性差，实际生产过程中具有进行地面钻井直接抽采和预抽采煤层气效果不佳的困难，利用在煤炭开采过程中，，采动影响范围大、压力释放充分、采动裂隙发育，有利于煤层气解吸等特点，通过理论分析、计算推导、实验室相似模拟和数值模拟等方法，在前人研究单一煤层开采煤岩体裂隙发育规律的基础上，针对近距离煤层群煤岩整体结构，研究其受采动影响下各个煤层的渗透特性变化情况与规律，通过多种监测手段并行结果互衍的方式，弄清近距离煤层群保护层开采后瓦斯的真正来源及通道，并在此基础上定量化地研究煤岩整体结构中的瓦斯储运规律。本文通过大量的现场实测数据和示踪气体分析的方法，在井下工程现场测试煤层群开采过程中，卸压煤层不同卸压区域随保护层开采工作面推进的渗透率变化情况以及瓦斯分源瓦斯涌出分析。探索形成新型的渗透率和采动裂隙时空演化规律监测手段，能够预测检验并修正瓦斯储运规律，为选择更合理的瓦斯防治技术，也为煤与瓦斯协调共采特供了理论与实践依据。
[Abstract]:In view of the low permeability and poor permeability of coal seams in most mining areas in China, it is difficult in the actual production process to carry out direct and pre-extraction coalbed methane extraction on the ground, so the mining influence range is large in the process of coal mining. Sufficient pressure release and the development of mining fissures are beneficial to the desorption of coalbed methane. Through theoretical analysis, calculation and derivation, laboratory similarity simulation and numerical simulation, etc., On the basis of the previous research on the law of rock mass fracture development in single coal seam, aiming at the whole structure of coal and rock in short distance coal seam group, the change and regularity of permeability characteristics of each coal seam under the influence of mining movement are studied. In this paper, the real source and channel of gas after mining of protective strata in close distance coal seams are clarified by means of parallel results of multiple monitoring methods, and on this basis, the laws of gas storage and transportation in the whole structure of coal and rock are quantitatively studied. In this paper, through a large number of field data and tracer gas analysis method, in the underground engineering field test coal seam mining process, The change of permeability in different pressure relief areas of pressure relief coal seam with the advance of mining face in protective layer and the analysis of gas emission from different sources of gas are analyzed. A new monitoring method of permeability and space-time evolution law of mining fracture can be formed, which can predict, test and correct the law of gas storage and transportation, and provide theoretical and practical basis for the selection of more reasonable gas prevention and control technology as well as for the coordination of coal and gas mining.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD712

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