软黏土蠕变试验及其经验模型研究  

Creep tests on soft clay and its empirical models

作　　者：卢萍珍[1] 曾静[1] 盛谦[1] 

机构地区：[1]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

出　　处：《岩土力学》2008年第4期1041-1044,1052,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.50609027);国家重点基础研究发展规划973项目(No.2002CB412708)

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。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.

关 键 词：软黏土 蠕变试验 分别加载蠕变曲线 应力-应变等时曲线 蠕变模型 

分 类 号：TU411.3[建筑科学—岩土工程]