Effect of vane shear rate on undrained shear strength of silty clay

被引：1
|
作者：
Xu L. [1 ]
Zhu H. [1 ]
Cheng G. [1 ,2 ]
Wang J. [1 ]
Zhang C. [1 ]
Zhang C. [1 ]
机构：
[1] School of Earth Sciences and Engineering, Nanjing University, Nanjing
[2] School of Computer Science, North China Institute of Science and Technology (National Safety Training Center of Coal Mines), Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 12期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Correction factor; Shear rate; Undrain shear strength; Vane shear test;
D O I：
10.11817/j.issn.1672-7207.2021.12.017
中图分类号：
学科分类号：
摘要：
In order to study the influence of shear rate on undrained shear strength of silty clay, firstly, a series of vane shear tests were carried out on silty clay samples with three moisture ratios and five shear rates. The peak and residual shear strength at different shear rates and soil moisture ratio were obtained. Secondly, the relationships between normalized peak shear strength, normalized residual shear strength and vane rate were fitted. Finally, the vane shear rate correction coefficient proposed by Bjerrum was modified based on fitting results. The results show that with the increase of shear rate, the soil peak and residual shear strengths increase markedly. Under the condition of high moisture ratio, the effect of shear rate on soil shear strength is more significant, and the residual shear strength is more sensitive to the change of shear rate. The relationship between the normalized shear strength and shear rate could be well fitted by both Semi-logarithmic function and power function. The semi-logarithmic law fitting parameters α and power law fitting parameters β have a good linear increasing relationship with soil moisture ratio. Considering the relationship between α, β and soil moisture ratio, the empirical equation between the rate correction coefficient and soil moisture ratio is obtained. © 2021, Central South University Press. All right reserved.
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页码：4372 / 4380
页数：8
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