Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays

QI Jian-feng; LUAN Mao-tian; WANG Zhong-tao; NIE Ying; FAN Qing-lai

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Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays

更新时间：2026-06-25

- Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays
- Vol. 29, Issue 8, (2008)
- 作者机构：
  
  大连理工大学海岸和近海工程国家重点实验室/土木水利学院岩土工程研究所,大连,116024
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411.3
- Online First：02 August 2013，
  
  Published：2008
- 稿件说明：
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QI Jian-feng, LUAN Mao-tian, WANG Zhong-tao, et al. Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays[J]. 2008, 29(8).
DOI：

QI Jian-feng, LUAN Mao-tian, WANG Zhong-tao, et al. Study on undrained shear behavior and hyperbolic stress-strain relationship of saturated clays[J]. 2008, 29(8). DOI：

摘要

采用真空抽吸制样技术制备的饱和重塑黏土，在0.015?3.75 %/min应变速率范围内进行了多组不固结不排水（UU）剪切试验。通过对试验结果的分析，着重探讨了应变速率和约束压力对应力-应变关系及其强度特性的影响。试验结果表明，黏土的应力-应变关系与强度特性基本上不依赖于约束压力，而受应变速率的影响较为显著，强度随应变速率的增加而增长，增长幅度可达70 %，通过对数据的归一化，采用线性拟和建立了不排水强度与应变速率之间的经验关系。进而考虑应变速率对不固结不排水应力-应变关系的影响，对双曲线非线性本构模型进行了研究，详细介绍了模型参数的确定方法，并分别采用静力三轴和扭剪试验结果对模型进行了验证。

Abstract

A series of unconsolidated-undrained (UU) triaxial tests are performed in order to examine the effect of strain rate and confining pressure on strength and stress-strain behavior of reconstituted saturated clays. Strain rate is controlled to vary between 0.015 %/min and 3.75 %/min. It is found by comparing the experimental data that strength and stress-strain behavior are mainly affected by strain rate

however

they are almost independent on confining pressure. Undrained shear strength of the saturated clay increases with increase of strain rate; and the increase of 70 % of strength may be attained. An empirical correlation between strength and strain rate is proposed after a given normalization. Furthermore

the hyperbolic constitutive model of nonlinearity is recommended in order to take the effect of strain rate on the stress-strain relation into consideration; and the experimentally-based procedure for defining the parameters in the hyperbolic model is given. The model is verified through test data in the monotonic triaxial and torsional shear tests.

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