Creep tests on soft clay and its empirical models

LU Ping-zhen; ZENG Jing; SHENG Qian

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Creep tests on soft clay and its empirical models

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- Creep tests on soft clay and its empirical models
- Vol. 29, Issue 4, (2008)
- 作者机构：
  
  中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411.3
- Online First：10 July 2013，
  
  Published：2008
- 稿件说明：
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LU Ping-zhen, ZENG Jing, SHENG Qian. Creep tests on soft clay and its empirical models[J]. 2008, 29(4).
DOI：

LU Ping-zhen, ZENG Jing, SHENG Qian. Creep tests on soft clay and its empirical models[J]. 2008, 29(4). DOI：

摘要

针对湖南竹城公路路基软土开展了系统的三轴固结不排水蠕变试验，得到不同围压、不同应力加载等级下的全过程蠕变曲线。进而通过“陈氏加载法”得到分别加载下蠕变曲线和应力-应变等时曲线。以围压100 kPa为例，得出应力-应变关系采用幂函数，而应变-时间关系采用双曲线关系的蠕变方程。对比分析表明，该蠕变方程较Singh-Mitchell模型、Mesri模型更适应试验数据，能够更好地反映和预测该软土的蠕变特性。

Abstract

Based on the stress-control triaxial apparatus

the CU triaxial creep tests of subgrade soft clay under different confining pressures were carried out by using multi-grade loading mode. The full-process creep curves under different confining pressures were obtained. Furthermore

the creep curves of multi-step constant load，the equal-time stress-strain curves were gained by using “Chen method”. Taking the confining pressure 100 kPa for example

a power&hyperbolic creep equation was proposed. In the equation

the power and hyperbolic equation are to model stress-strain and strain-time relationship respectively. Compared with Singh-Mitchell’s model and Mesri’ model

the creep equation suggested is thought to be more suitable to reflect the creep characteristics.

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