煤层采动卸压后，导致采场上覆岩层产生裂隙，改变了煤岩体原始的孔隙度和渗透率。瓦斯在孔隙、裂隙介质中渗流及其与煤岩体变形耦合规律的研究，对确定科学、合理的抽采方法、有效防治瓦斯灾害具有重要的理论价值。论文综合采用理论分析、相似模拟实验、数值模拟等研究方法，对采动裂隙时空演化规律和卸压瓦斯渗流变化规律展开了系统研究，揭示了采动裂隙与卸压瓦斯渗流的耦合规律。主要研究成果如下： （1）在分析采动裂隙场成因、卸压瓦斯来源及其流态的基础上，运用多孔介质渗流力学、岩石力学、流体动力学等理论，基于采动裂隙场与卸压瓦斯渗流的固气耦合数学模型，推导出固气耦合相似条件，为固气耦合相似模拟实验提供了理论基础。 （2）研发了固气耦合相似模拟实验系统，解决了固气耦合实验中气体的密封方法和封闭箱体内模拟开采关键技术，为研究采动裂隙场时空演化与卸压瓦斯渗流耦合规律的相似模拟实验奠定了实验基础。 （3）通过天池煤矿401工作面固气耦合相似模拟实验，研究了卸压瓦斯在煤层开采过程中渗透率的变化规律。结果表明，随着工作面的不断推进，上覆岩层在受到初次扰动、逐步压实、直至垮落的过程中，气体的渗流速度经历了先升高后降低、再升高再降低，最终逐渐稳定的过程。 （4）研制了以石蜡为胶凝剂的相似模拟实验材料，配制出更适合固气耦合模拟实验的材料配比，完善了固气耦合相似模拟实验台的应力和渗流测试系统，利用自主研发的相似实验材料试件渗透率测试设备，对不同配比的试件进行了测试，分析了实验材料中石蜡和油的含量对试件物理力学参数的影响。实验材料的力学参数满足固气两相模拟实验要求。 （5）建立了不同主关键层层位的固气耦合相似模拟实验模型，结合RFPA2D-Flow数值模拟结果，分析了不同主关键层层位对覆岩采动裂隙演化特征和卸压瓦斯渗流规律的影响。 （6）采动裂隙场与卸压瓦斯渗流场之间相互影响、相互作用，是一个动态平衡体系。煤体采出后，造成覆岩体应力场重新分布，影响了采动裂隙的演化，瓦斯在裂隙场内的运移改变了渗流场的分布，从而导致煤岩体的受力状态发生变化，应力场进一步改变；同时，裂隙场范围的变化，导致煤岩体应力场的改变，进而影响渗流场变化。 论文系统分析了采动裂隙与卸压瓦斯耦合规律，实验结果对科学、合理的确定抽采方法和有效防治瓦斯灾害技术，实现煤与瓦斯安全共采提供了一定的理论依据。

Released coal mining induces overlying strata fracturing and changes original porosity and permeability of coal-rock mass. Studying on the laws of gas seepage in pore and fissure medium and its coupling with the deformation of coal and rock is theoretically important for establishing the scientific extraction method and effective gas disaster preventing techniques. Comprehensively using the theoretical analysis, similar simulation experiment and numerical simulation methods, the research on the time-space evolution characteristics of mining-induced fractures and the seepage laws of released methane are carried out, and the coupling laws of the mining-induced fractures and released gas seepage are revealed. The main results of the research are as follows: （1）Based on the analysis of the mining induced fractures field causes and relieved gas source and its flow, using porous medium percolation mechanics, rock mechanics and fluid dynamics theories, the similar conditions of solid gas coupling are derived on the basis of solid gas coupling mathematical model of mining induced fracture field and released gas seepage, which provides theoretical basis for solid gas coupling similar simulation experiment. （2）Self-developed solid gas coupling similar simulation experiment system successfully solved the gas seal problem in the solid gas coupling experiment process and the key technology of simulation mining in the enclosing box, which lays foundation for further experimental research of analogue simulating tests on the coupling laws of time-space evolution of mining-induced fractures and the released methane seepage. （3）Based on the solid gas coupling analogue modeling of 401 working face of the Tianchi mine, the permeability distribution rules of gas in mining process are studied. The results shows that with the constant advancing of working face, the gas seepage velocity experiences twice rise-fall changes and gradually becomes stable in the end, during the course of initial disturbance, gradual compacting, and collapsing of overlying strata . （4）More reasonable ratio of material for solid gas coupling simulation experiment is found out when taking paraffin as the gelling agent. Test system of stress and seepage of solid gas coupling analogue simulation experiment system is improved. Using the self-developed permeability equipment for testing similar experimental specimens, different matching specimens are tested. The influence of paraffin and oil of different quantity in the experiment materials on the physical mechanical parameters of specimens are analyzed. It indicates that the experimental material mechanical parameters meet the need of gas-solid simulation experiment. （5）Based on the solid gas coupling analogue simulation experiment model of different positions of key layers and numerical simulation results of RFPA2D-Flow, the effects of key layers on the change of mining-induced fractures and released gas seepage rules are analyzed. （6）Mining-induced fracture field and released gas seepage field interact with each other，which is a dynamic balance system. Overlying strata stress fields redistribute after mining, which affects the evolution of the mining-induced fractures. And the motion of gas in fracture field changes the distribution of the seepage field, which causes the changing of stress field when the coal and rock stress fields change; meanwhile, the change of the fracture field range leads to the change of coal and rock stress field and further influences seepage field change. The coupling laws of mining-induced fracture and released gas are systematically analyzed in this paper. The experimental results provide the theoretical foundation for the scientific extraction methods and effective gas disasters prevention techniques. It also provides guide in certain degree for the safely simultaneous extracting of coal and gas.