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采用在线加热同步观测煤岩样孔隙结构演变的实验方法,对常温~350℃时的贫煤和花岗岩试件进行细观结构演化研究,得出以下结论:(1)相同条件下,兼具固体颗粒和纯孔隙的子网格受温度作用更为明显,孔隙变化更大。由于该孔隙为多孔介质的吼道孔隙,故孔隙大小的变化会对煤岩渗透率造成显著影响;(2)温度升高时,花岗岩和大部分贫煤样品的渗透率具有先增大后减小的特性,少数贫煤样品的渗透率呈现单调下降趋势;(3)煤岩样孔隙率越小,其孔隙率单调降低的临界温度点越低。热力耦合作用下同步分析煤岩体细观结构的演变,进而探求其宏细观对应规律,已成为岩石渗流力学研究的重要趋势。
Simultaneously observing the evolution of the pore structure of coal and rock samples by on-line heating, the mesophase structure evolution of lean coal and granite samples at normal temperature ~ 350 ℃ was studied. The conclusions are as follows: (1) Under the same conditions, both solid Particles and pure pores of the sub-grid by the role of temperature is more obvious, pore changes greater. Because the pore is a roaring pore of porous media, the change of pore size will have a significant effect on the permeability of coal and rock. (2) The permeability of granite and most lean coal samples increases first and then decreases with increasing temperature The permeability of a few lean coal samples showed a monotonous decreasing trend; (3) The smaller the porosity of coal-rock samples, the lower the critical temperature point of monotonous decrease of porosity. Simultaneous analysis of the evolution of the meso-structure of coal and rock mass under the action of thermal coupling and further exploration of the corresponding laws of the macro-meso-scale has become an important trend in the research of rock seepage mechanics.