Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles

被引：33
作者：
Yang, Zhongnian [1 ]
Zhang, Liang [1 ,3 ]
Ling, Xianzhang [2 ]
Li, Guoyu [3 ]
Tu, Zhibin [1 ]
Shi, Wei [1 ]
机构：
[1] Qingdao Univ Technol, Qingdao 266033, Shandong, Peoples R China
[2] Harbin Inst Technol, Harbin 150001, Heilongjiang, Peoples R China
[3] State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
来源：
COLD REGIONS SCIENCE AND TECHNOLOGY | 2019年 / 163卷
关键词：
Freeze-thaw cycle; Expansive soil; Anisotropic consolidation ratio; Dynamic shear modulus;
D O I：
10.1016/j.coldregions.2019.04.003
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
To study the dynamic shear modulus and damping ratio of expansive soil in high railway embankment slope engineering structures after freeze-thaw cycles, temperature-controlled dynamic triaxial testing of expansive soil under freeze-thaw cycles was carried out under confining pressures of sigma(3) = 10 and 50 kPa and an anisotropic consolidation ratio. The results show that the dynamic characteristics of expansive soil in slopes under freeze-thaw cycles vary significantly with the stress state. Freeze-thaw cycles cause the consolidation of expansive soil under confining pressure, increasing the dynamic shear modulus G(d) and decreasing the damping ratio.. In a single freeze-thaw cycle, G(dmax) increases by a maximum of 27.6%, and lambda(max) decreases by 7.6%. This result is different from the traditional understanding of frost heave and thaw soil structure damage theory. Under the action of deviatoric stress, the freeze-thaw cycle causes additional shear deformation of the expansive soil, thereby increasing the dynamic shear modulus of the soil.
引用
收藏
页码：27 / 33
页数：7
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