摘要
砂泥岩混合料经干湿循环作用后,其力学性质会发生改变。为研究干湿作用对砂泥岩混合料的影响,本文开展不同泥岩质量分数(30%、50%、70%)、干湿循环次数(0、1、3、5和10次)和浸泡时间(2、4、12、24和48 h)下砂泥岩混合料的压缩试验。结果表明:1)低泥岩掺量时,试样孔隙比较小,混合料抗变形能力更强;2)随着干湿循环次数的增加,混合料轴向应变越大,孔隙比减少明显;3)长时间浸泡会导致泥岩泥化甚至崩解,增大混合料轴向变形。3种因素对应的e-p曲线和ε-p曲线的斜率都随着应力的增大逐渐减小,均呈现对数增长。
In order to study the influence of dry-wet interaction on sandstone and mudstone particle mixture,and to carry out compression tests on sandstone and mudstone particle mixture under dry-wet cycle,compression tests were carried out under different mudstone content(30%,50%,70%),different dry-wet cycle times(0,1,3,5 and 10 times)and different immersion times(2,4,12,24 and 48 h).The results show that:1)When the content of mudstone is low,the porosity of the sample is relatively small,and the deformation resistance of the mixture is stronger;2)With the increase of the number of dry-wetting cycles,the axial strain of the mixture increases,and the void ratio decreases significantly;3)Long-term soaking will lead to mudstone sludge or even disintegration,increasing the axial deformation of the mixture.The slopes of the e-p curve and the ε-p curve corresponding to the three factors all decrease gradually with the increase of stress,and all show logarithmic growth.
作者
李辉
王杰
LI Hui;WANG Jie(College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;College of Mechanical and Electrical Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《工程建设》
2023年第8期9-14,共6页
Engineering Construction
基金
重庆市研究生联合培养基地建设项目(JDLHPYJD2018001)。
关键词
砂泥岩混合料
压缩特性
干湿循环
浸泡时间
孔隙比
sandstone and mudstone particle mixture
compression characteristics
dry-wet cycle
soaking time
void ratio
