工程地质学报2017，Vol.25Issue(1)：36-42,7.DOI:10.13544/j.cnki.jeg.2017.01.005
基于CD三轴试验的非饱和黄土吸应力强度参数确定
DETERMINATION OF SUCTION STRESS STRENGTH PARAMETERS OF UNSATURATED LOESS WITH CONVENTIONAL TRIAXIAL CD TEST
摘要
Abstract
The study on strength theory of unsaturated soil and the determination of related parameters are the core of the research in unsaturated soil mechanics.At present,Bishop's single-variable strength theory,Fredlund's double-variables strength theory,and Lu Ning's suction stress strength theory are generally accepted.Lu Ning introduced the concept of suction stress and the suction stress characteristic curve (the relationship between the suction stress and the volumetric water content).This theory avoids the determination of matric suction and it is convenient for widely promotion in engineering practice.This paper tests the effective strength parameters based on the conventional triaxial CD test with different water contents.Results show that the effective internal friction angles with different water contents are basically same.The effective cohesion increases with the water content.When the water content increases to the plastic water content,the cohesion reaches a constant value.According to the relationship between effective cohesion and the stress suction,suction stress characteristic curve can be obtained and then fit the stress suction function.The function can explain unsaturated strength combined with the effective internal friction angle and saturated effective cohesion.关键词
非饱和黄土/有效强度参数/吸应力/吸应力特征曲线Key words
Unsaturated loess/Effective strength parameters/Suction stress/Suction stress characteristic curve分类
天文与地球科学引用本文复制引用
张新婷,李同录,邢鲜丽,李萍..基于CD三轴试验的非饱和黄土吸应力强度参数确定[J].工程地质学报,2017,25(1):36-42,7.基金项目
973项目(2014CB744701),中央高校优博项目(310826150005)资助. （2014CB744701）
