摘要
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。
The meso-structure evolution of coal and granite samples at normal temperature to 350 ℃ was studied by means of on-line heating and synchronous observation. Under the same conditions, the sub meshes with solid particles and pure pores are affected by the temperature more obviously, and the pores are larger. As these pores are throats of porous media, the change of their sizes have a significant effect on the permeability of coal and rock. The permeability of granite and most of the meager coal samples increase first and then decrease with the increase of temperature, while a few meager coal samples show a monotone downward trend. The smaller the coal porosity is, the lower the critical temperature of porosity decreasing.
作者
谢建林
赵阳升
XIE Jianlin ZHAO Yangsheng(College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China College of Enviroment and Safety, Tailyuan University of Science and Technology, Taiyuan, Shanxi 030024, China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2017年第3期543-551,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家杰出青年科学基金项目(51225404)
国家自然科学基金资助项目(51379201
51404161)~~
关键词
岩石力学
煤岩体
在线加热
细观结构
渗透率
rock mechanics
coal-rock mass
on-line heating
meso-structure
permeability
