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
相关论文
共 34 条
  • [1] Andersland O., 1978, GEOTECHNICAL ENG COL
  • [2] Berg R. L, 1996, RESILIENT MODULUS TE, P67
  • [3] Chen F. H, 2012, FDN EXPANSIVE SOILS, P54
  • [4] Cheng Mao, 2005, CHIN J ROCK MECH ENG, P1783
  • [5] Chunming Liu, 2013, RES SLOPE INSTABILIT
  • [6] Dobry R., 1987, P INT S GEOTECHNICAL, V2, P51
  • [7] Pore-water pressures in freezing and thawing fine-grained soils
    Eigenbrod, KD
    Knutsson, S
    Sheng, DC
    [J]. JOURNAL OF COLD REGIONS ENGINEERING, 1996, 10 (02) : 77 - 92
  • [8] Fukuda M., 1991, Proceedings, International Arctic technology conference., P621
  • [9] Hardin BO, 1972, J SOIL MECH FOUND DI, V98, P603, DOI [DOI 10.1061/JSFEAQ.0001756, 10.1061/JSFEAQ.0001756, DOI 10.1016/0022-4898(73)90212-7]
  • [10] [何满潮 He Manchao], 2005, [吉林大学学报. 地球科学版, Journal of Jilin University], V35, P496
1234