摘要
基于MTS815.02型岩石伺服渗透试验系统,应用两种实验方法测定了岩石的渗透特性,给出煤系地层中多种岩石全应力-应变过程中渗透率变化范围,对几种岩石的渗透特征进行了分析和讨论。研究表明:1)煤系地层岩石全应力-应变过程的渗透率通常在10-9到10-4Darcy量级之间;2)不同岩石在应力峰值前后其渗透性呈现不同的变化趋势;3)岩石渗透率的离散性很大,即使在相同的试验条件下,渗透率变异系数大多在0.65以上,其离散性按粗砂岩、泥岩、砂质页岩、中砂岩、细砂岩、砾岩、石灰岩顺序逐渐增大;4)在MTS815.02系统上,当所测岩样渗透率小于10-4Darcy量级时,应采用瞬态法,当渗透率量级大于10-4Darcy时,可改用稳态法测定。岩石变形过程中应力场和渗流场的耦合作用十分复杂,渗透率受孔隙压力、围压、试件尺寸、饱和程度等因素影响。
The permeability of rock samples collected from coal-bearing strata was tested on MTS 815.02 Rock Mechanics Test System by using two different methods.Variation ranges of permeability for several kinds of rocks in the total stress-strain process were obtained.And permeability characteristics of these rocks were analyzed and discussed.Some remarks can be obtained from the results.The permeability of the tested rocks is usually between 10^-9 and 10^-4 Darcy.The permeability near peak values of stress of diffe...
出处
《实验力学》
CSCD
北大核心
2006年第2期129-134,共6页
Journal of Experimental Mechanics
关键词
煤系地层
渗透特性
渗透率
应力
应变
coal-bearing strata
permeating characteristic
permeability-stress
stress
strain
