工程地质学报2017，Vol.25Issue(1)：80-87,8.DOI:10.13544/j.cnki.jeg.2017.01.011
纤维加筋膨胀土的三轴蠕变特性试验研究
TRIAXIAL CREEP PROPERTIES OF FIBER REINFORCED EXPANSIVE SOIL
摘要
Abstract
Studies on the properties and improvements of expansive soil have drawn more and more attentions because of many engineering accidents caused by deformation of expansive soil.In order to investigate the creep characteristics of fiber reinforced expansive soil,unsaturated triaxial creep tests are carried out with the consideration of the influence of water content and reinforcement ratio of basalt fiber mixed into the expansive soil.Long-term strength of the fiber reinforced expensive soil is analyzed through isochronous stress-strain curves.Meanwhile,Mesri creep model is established and verified.The main conclusions are as follows:By comparing strain-time curve,it finds that the fiber reinforced expansive soil has an obvious role on reducing creep deformation.However,there exists an optimal reinforcement rate.If fiber content surpasses the optimal reinforcement rate,the creep effect cannot be significantly decreased.The creep properties of the fiber reinforced expansive soil increase as the moisture content decreases.They have the optimum moisture content.If less than the optimum moisture content,the creep effect cannot be significantly increased.Isochronous stress-strain curves can be obtained from the straintime curve at different load levels.The long-term strength of the samples can be figured out according to the inflexion point of isochronous stress-strain curves.Long-term strength of expansive soil can be significantly improved by fiber reinforcement.In the test,the long-term strength of 0.4％reinforced expansive soil is improved by 26.7％ compared with pure soil under the same condition.The long-term strength of 0.6％ reinforced expansive soil is improved by 23.3％.Mesri creep model can generally reflect the triaxial creep characteristics of fiber reinforced expansive soil.关键词
纤维加筋膨胀土三轴蠕变试验Mesri蠕变模型玄武岩纤维Key words
Fiber-reinforcement/Expansive soil/Triaxial creep test/Mesri creep model/Basalt fiber分类
天文与地球科学引用本文复制引用
陈晓雪,独莎莎,张丹,李博,季婷媛..纤维加筋膨胀土的三轴蠕变特性试验研究[J].工程地质学报,2017,25(1):80-87,8.基金项目
国家自然科学基金项目(41272315,40702045)资助. （41272315,40702045）
