岩土工程学报2024，Vol.46Issue(z2)：43-48,6.DOI:10.11779/CJGE2024S20027
软黏土带压冻融循环下不固结力学特性试验研究
Experimental study on unconsolidated mechanical properties of soft clay under freeze-thaw cycles with confining pressure
摘要
Abstract
The artificial freezing method and the soil in seasonally frozen soil areas usually undergo freeze-thaw cycles under a certain confining pressure.Affected by the freeze-thaw confining pressure and undrained conditions,the residual excess pore pressure of the melted soil results in that the soil is not in a fully consolidated state.Therefore,conducting researches on the undrained mechanical properties of soil under this condition is of great engineering and scientific significance.In this study,the undrained triaxial shear tests and microscopic scanning tests on the remolded muddy clay after freeze-thaw cycles using the self-developed temperature controlled triaxial apparatus are conducted.The effects of freeze-thaw confine pressure,the freeze-thaw cycles and freezing temperature on the mechanical properties of post-freezing and thawing silty clay are analyzed.Compared with that without no confining pressure,the number of flocculation structures and pores in the soil increases after freeze-thaw under confining pressure,thus the weaking effects of freeze-thaw cycles on the strength and modulus of soil are accelerated.As the freezing temperature decreases and the number of freeze-thaw cycles increases,the weakening effects of muddy clay become more obvious.关键词
冻融围压/冻融循环/不排水力学特性/三轴试验/微观结构Key words
freeze-thaw confining pressure/freeze-thaw cycle/undrained mechanical property/triaxial test/microstructure分类
建筑与水利引用本文复制引用
郎瑞卿,裴璐熹,孙立强,冯守中..软黏土带压冻融循环下不固结力学特性试验研究[J].岩土工程学报,2024,46(z2):43-48,6.基金项目
国家自然科学基金项目(42277133,52078336) （42277133,52078336）
中国博士后基金面上项目(2022M721000) （2022M721000）
中国科协青年托举工程(YESS20230586) （YESS20230586）
天津市研究生科研创新项目(2022SKYZ179) （2022SKYZ179）
