渗透压循环加卸载作用下页岩渗透率演化规律研究  

Permeability evolution law of shale under cyclic loading and unloading of osmotic pressure

作　　者：王俊光[1] 孙清林 梁冰[1] 余庆熔 WANG Junguang;SUN Qinglin;LIANG Bing;YU Qingrong(School of Mechanics&Engineering,Liaoning Technical University,Fuxing 123000,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《振动与冲击》2021年第7期253-259,共7页Journal of Vibration and Shock

基　　金：国家重点研发计划项目(2016YFC0600704);国家自然科学基金(51404130);辽宁省自然科学基金(20180550708);辽宁工程技术大学学科创新团队资助(LNTU20TD-11)。

摘　　要：为研究页岩在渗透压循环加卸载作用下渗透率演化规律,利用改进的脉冲衰减气体渗透率测量装置对页岩进行不同围压、不同渗透压循环加卸载试验。试验结果表明:初始围压的大小会影响页岩的初始渗透率,初始围压越大初始渗透率越小;在定围压循环加卸载渗透压的过程中,渗透率随着渗透压的加载而增大,随着渗透压的卸载而减小;在同一渗透压加卸载循环中,加载阶段和卸载阶段的渗透率曲线不重合,且卸载阶段渗透率曲线位于加载阶段渗透率曲线的上方;对渗透率随渗透压循环加卸载的变化关系进行拟合,拟合结果符合二次函数关系,相关系数大于95%。In order to study permeability evolution law of shale under cyclic loading and unloading of osmotic pressure,cyclic loading and unloading tests of shale with different confining pressures and different osmotic pressures were conducted by using the improved pulse attenuation gas permeability measurement device.The test results showed that initial confining pressure affects initial permeability of shale,and the larger the initial confining pressure,the smaller the initial permeability;in process of cyclic loading and unloading of osmotic pressure with constant confining pressure,the permeability increases with loading of osmotic pressure and decreases with unloading of osmotic pressure;in the same osmotic pressure loading and unloading cycle,permeability curve in loading stage doesn’t coincide with that in unloading stage,and the latter is above the former;the fitting result of the relation between permeability and cyclic loading and unloading of osmotic pressure is in accordance with quadratic function,and the correlation coefficient is more than 95%.

关 键 词：页岩 渗透率 渗透压 循环加卸载 

分 类 号：TU45[建筑科学—岩土工程]