摘要
介绍了三轴应力状态下测定大煤样导水系数的实验装置与实验方法。对全国18个主采煤层煤样的导水系数测定结果表明,煤体的导水系数随体积应力的增加呈负指数规律衰减,随孔隙水压力的增加呈正指数规律增加;在统计意义上,煤体的导水系数与煤的变质程度相关,但也受煤层的赋存条件与结构特征的影响,应在实验的基础上评价煤层的渗透性能。研究结果对煤层注水、瓦斯抽放和煤层气开发等工程实践具有一定的意义。
The test device and method on the water conduction coefficient for large sample under triaxial stress state are introduced. The tested results from the 18 coal seams in China have made known that the water conduction coefficients of the coal masses are attenuating in minus exponential law with the volume stress increasing, and increasing in positive exponential law with pore water pressure increasing. In statistical sense, the water conduction coefficients of the coal masses are interrelated with the coal metamorphic grade. But they are also influenced by the geological and structural conditions of the coal seams. It should be based on the test to evaluate coal seam permeability. The study results are of some guide meaning for coal seam infusion, gas suction and coal gas exploitation.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2003年第4期587-591,共5页
Rock and Soil Mechanics
基金
教育部高等学校骨干教师资助计划项目(J20046)
山西省青年科学基金项目(961027)资助。
关键词
导水系数
体积应力
孔隙水压力
大煤样
large sample
triaxial stress
water conduction coefficient
test in laboratory
