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受载瓦斯煤体变形渗流特征及控制机理研究
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摘要
荷载下含瓦斯煤的变形破坏-渗流特征及机理问题的研究,是有效预防煤岩瓦斯动力灾害发生的关键问题之一。论文模拟深部煤层赋存条件,以饱含瓦斯原煤为研究对象,采用实验室测试、物理模拟和理论分析等手段,运用煤岩学、岩体力学、统计热力学、弹性力学及表面物理化学等理论知识与方法,系统研究了煤体微观结构特征与渗透率、吸附变形与渗透率、力学变形与渗透性之间的协同响应和时空演化规律,主要包括吸附变形特征及机理,不同力学条件含瓦斯煤的力学变形破坏特征及机理,推导出了理想状态下的煤吸附变形与热力学参数之间的计算公式,建立了高温高压下基于煤非均质性的Fractal应力-应变-渗透率力学模型,揭示了影响含瓦斯煤的吸附性、变形破坏特征与渗透性差异的本质原因,为进一步研究深部煤层瓦斯动力灾害机理提供了理论基础,对煤与瓦斯突出防治和煤层气开采具有重要的指导意义。
It is one of the keys to prevent availably gas dynamic disasters in coal mines that the deformation-percolation characteristics and mechanism of coal containing gas is studied under loading. A series of methods and theories are applied on the research, such as laboratory tests, physical simulation, coal petrology, rock mass mechanics, statistical thermodynamics, mechanics of elasticity and surface physical chemistry, and so on. Base on the above theories and methods, the synergy relationships between permeability and coal deformation, adsorption deformation, and mechanical deformation have been established, and their changes with time and space have been analyzed. Those includes the study to absorption deformation and its formation mechanism, and the deformation and failure characteristics of coal containing gas under different mechanics conditions and its formation mechanism. After comprehension of above achievements, the calculation formula is deduced which is used to describe the relationship between the thermodynamic parameters and adsorption deformation under ideal conditions. Based on the heterogeneity of coal, the mechanical model of Fractal stress-strain-permeability under high temperature and high pressure conditions is established. The essence affecting the absorbability of coal containing gas, the deformation characteristics, and the changes of permeability has been revealed. Those provide theoretical basis for further research of dynamic disaster mechanism in deep coal seam, and important guides for gas outburst prevention and control, and coal-bed methane development.
引文
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