摘要
以云南红土为研究对象,以湿—干循环作为控制条件,考虑湿—干循环次数、初始含水率、干密度3个影响因素,进行室内无侧限抗压强度试验,研究湿—干循环作用下脱湿红土的无侧限抗压强度与湿—干循环次数、初始含水率、干密度的关系。结果表明:经过湿—干循环作用,脱湿红土的应力—应变关系曲线呈典型的应变软化型特征。相比湿—干循环前,湿—干循环后红土的应力—应变关系曲线的应变软化特征更为明显,无侧限抗压强度提高,且随着湿—干循环次数的增大,脱湿红土的无侧限抗压强度减小。不同初始含水率、干密度下,脱湿红土的应力—应变关系曲线均呈应变软化型;随着初始含水率的增大,湿—干循环前,素红土的无侧限抗压强度减小,相对应的峰值应变增大;湿—干循环后,脱湿红土的无侧限抗压强度增大,相对应的峰值应变增大。随着干密度的增大,湿—干循环前后红土的无侧限抗压强度均增大,相对应的峰值应变也呈增大趋势。
This paper takes Yunnan laterite as the research object,takes the wet-dry cycle as the control condition.The indoor unconfined compressive strength test is carried out considering the three influencing factors of wet-dry cycle times,initial moisture content and dry density.The relationship between the unconfined compressive strength of dehumidified laterite under wet-dry cycle and the wet-dry cycle times,initial moisture content and dry density is studied.The results show that the stress-strain relationship curve of the dehumidified laterite presents typical strain-softening characteristics after the wet-dry cycle.Compared with that before the wet-dry cycle,the strain softening characteristics of the stress-strain curve of the laterite after the wet-dry cycle are more obvious,and the unconfined compressive strength increases,and with the increase of the number of wet-dry cycles,the unconfined compressive strength decreases.Under different initial moisture content and dry density,the stress-strain curves of dehumidified laterite are strain softening.With the increase of initial moisture content,the unconfined compressive strength of laterite decreases and the corresponding peak strain increases before the wet-dry cycle,and after the wet-dry cycle,the unconfined compressive strength and the corresponding peak strain of dehumidified laterite increase.With the increase of dry density,the unconfined compressive strength of laterite increases before and after the wet-dry cycle,and the corresponding peak strain also increases.
作者
唐芸黎
黄英
贺登芳
南海宇
TANG Yunli;HUANG Ying;HE Dengfang;NAN Haiyu(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2023年第1期112-121,共10页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51568031)。
关键词
云南红土
湿—干循环
初始含水率
干密度
无侧限抗压强度
Yunnan laterite
wet-dry cycle
initial moisture content
dry density
unconfined compressive strength
