摘要
为探讨册田水库主坝下覆粉质黏土体在不同应力路径下力学特征,分别设计了常规三轴(CTC)、等轴卸荷三轴(RTC)、卸荷三轴(TC)三种试验方法,探讨了不同加、卸荷速率对试样力学特征的影响。研究表明:CTC试验与RTC试验中,围压不会改变加、卸荷速率对应变特征的影响;当加、卸荷速率愈大,试样峰值应力愈低。围压作用会抑制试验速率对承载应力的削弱效应,RTC试验下应力受卸荷速率影响最敏感。TC试验中,卸荷速率对应变特征影响不及围压因素,围压愈大,试样峰值应力后下降愈不明显。论文可为粉质黏土的破坏特征以及卸荷力学试验研究提供参考。
In order to explore the mechanical characteristics of the silty clay soil under different stress paths in the main dam of the Setian Reservoir,three test methods were designed:conventional triaxial(CTC),equiaxed unloading triaxial(RTC),and unloading triaxial(TC).The influence of different loading and unloading rates on the mechanical characteristics of the samples was investigated.The results show that in CTC and RTC tests,confining pressure does not affect the strain characteristics of loading and unloading rates.When the loading and unloading rates are higer,the peak stress of the sample is lower.The confining pressure will suppress the weakening effect of test rate on bearing stress,and the stress under RTC test is most sensitive to the influence of unloading rate.In the TC test,the unloading rate has less influence on the strain characteristics than the confining pressure factor.When the confining pressure is greater,the significant decrease in peak stress of the specimen is less.The paper provides reference for the failure characteristics of silty clay and the experimental study of unloading mechanics.
作者
张亮
ZHANG Liang(Shanxi Provincial Water Resources and Hydropower Survey and Design Institute Co.,Ltd.,Taiyuan Shanxi,030024,China)
出处
《江西水利科技》
2025年第3期157-161,173,共6页
Jiangxi Hydraulic Science & Technology
关键词
册田水库
粉质黏土
应力路径
卸荷
力学试验
Setian Reservoir
Powdery clay
Stress path
Unloading
Mechanical testing
