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以二次成型煤样为研究对象,运用自行研制开发的含瓦斯煤热-流-固耦合三轴伺服渗流试验装置对含瓦斯煤样三轴加载过程中横向变形和与瓦斯流动特性的耦合关系进行了试验研究。结果表明:弹性力学定义的泊松比不能准确表征含瓦斯煤样的横纵应变特性,其关系可用二次函数表征;在预加载荷引起的横压向应变恢复阶段瓦斯流动速度变化呈先急剧降低再缓慢增加特性;在横向应变逐渐向扩张应化转变阶段,煤样内部的瓦斯流动速度呈单调缓慢增加趋势,且存在一个内部结构临界状态点使煤样内瓦斯流动速度最小;含瓦斯煤样处于横向压应变状态起始时的瓦斯流动速度要大于处于横向应变呈扩张状态末端时的瓦斯流动速度。
Taking the secondary coal sample as the research object, the coupling between the lateral deformation and the gas flow characteristics during the triaxial loading process of gas-bearing coal samples was studied by using the self-developed three-axis servo-percolation test device Conducted a pilot study. The results show that the Poisson’s ratio defined by elastic mechanics can not accurately characterize the horizontal and vertical strain characteristics of gas-bearing coal samples, and the relationship can be characterized by quadratic function. The gas flow velocity changes sharply before the strain recovery stage Decrease and then slowly increase; in the stage of gradual extension of lateral strain to the transitional phase, the gas flow velocity in coal sample tends to increase monotonously and slowly, and there exists a critical point of internal structure to minimize the gas flow velocity in coal sample; The gas flow velocity at the beginning of the transverse compressive strain state is greater than the gas flow velocity at the end of the transverse strain extensional state.