Research on the deformation evolution and the strength weaking of slip soil under wetting-drying cycle

被引：0
|
作者：
Dong J. [1 ]
Zhao Z. [1 ]
Yang J. [1 ]
Huang Z. [1 ]
机构：
[1] College of Resources and Environment, North China Inst. of Water Conservancy and Hydroelectric Power, Zhengzhou
来源：
Huang, Zhiquan (huangzhiquan@ncwu.edu.cn) | 1600年 / Sichuan University卷 / 48期
关键词：
Cohesion; Deformation evolution; Internal friction angle; Shear strength; Slip soil; Wetting-drying cycle;
D O I：
10.15961/j.jsuese.2016.s2.001
中图分类号：
学科分类号：
摘要：
Wetting-drying cycling is a common water-soil interaction mode, which plays an important role in the strength and deformation of rock and soil and the stability of landslide. Based on the analysis of the basic characteristics of the slip soil of silt and silty clay, the deformation evolution and strength weakening characteristic of different types of slip soil under the effect of wetting-drying cycle were studied through the indoor dry-wet cycling test and direct shear test. The research results showed that in the state of air dried, the deformation behavior of silty soil of slip soil cracked in the internal of soil, and with the increase of cycle number, the cracks continue expanded and widened, then the cracks closed after saturation. On the other hand, the volume of silty clay shrinked in air dried condition and expanded after saturation. The strength weakening of the two kinds of slip soil presented the same rules under the effect of wetting-drying cycling, the degree of strength weakening was largest at the first cycle of dry and wet, and the strength reached a certain value after the third cycle. As for shear strength parameters of the two types of slip soil, the reduction of the cohesion showed a logarithmic curve form with cycle number, and the angle of internal friction showed a linear form with cycle number. Finally, by analyzing of the sensitivity and significant of the shear strength parameters, it was found that the shear strength of slip soil decrease was mainly due to the lower of cohesive force under the effect of wetting-drying. Compared with the internal friction angle, cohesion was affected by the dry-wet circulation more significantly. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved.
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页码：1 / 7
页数：6
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