摘要
通过对不同饱和度与围岩条件下的泥岩试样进行三轴剪切实验,研究易崩解泥岩力学特性随含水状态变化的演化规律,分析了各组试样的应力-应变曲线和强度变化特点,并对强度变化机理进行讨论。试验结果表明:固结围压的提高使泥岩抗剪强度大幅增加;在饱和度80%以上时,泥岩应力-应变曲线均保持为应变硬化型;饱和度在80%以内的应力-应变曲线均保持为应变稳定型;由摩尔库伦准则计算的泥岩三轴抗剪强度随饱和度增加呈衰减趋势;易崩解泥岩的颗粒在饱和度增加过程中逐渐松散化,微孔隙逐渐连通,强度不断衰减。
Triaxial shear experiments were carried out on samples with different saturation and surrounding rock conditions to study the evolution of mechanical properties of disintegrating mudstone with water content.The stress-strain curves and strength change characteristics of each group of samples were analyzed,and the strength change mechanism was discussed.The test results show that the shear strength of mudstone increases greatly with the increase of consolidation confining pressure pairs.The stress-strain curves of mudstone remain strain hardening at 80%above.The stress-strain curves with saturation less than 80%remain strain-stable.The triaxial shear strength of mudstone calculated by Mohr Coulomb criterion decreases with the increase of saturation.In the process of increasing saturation,the particles of disintegration-prone mudstone are gradually dispersed,the micropores are gradually connected,and the strength is constantly decaying.
作者
孙修乾
SUN Xiuqian(Xiamen Branch,Dalian Municipal Design and Research Institute Co.,Ltd.)
出处
《广东建材》
2024年第8期42-45,共4页
Guangdong Building Materials
关键词
易崩解泥岩
建筑基坑
抗剪切试验
饱和度
Disintegration-prone mudstone
Building foundation pit
Shear resistance test
Saturation
