洞庭湖地区典型网纹红土的单轴固结实验研究  

Research on Uniaxial Consolidation Test of the Typical Reticulate Red Clay Around Dongting Lake Area

作　　者：晏露超[1] 李建中[1] 唐喜青[1] 

机构地区：[1]中南大学地学与环境工程学院,湖南长沙410083

出　　处：《岩土工程技术》2009年第6期276-279,283,共5页Geotechnical Engineering Technique

基　　金：湖南省自然科学基金项目(07JJ6087);武汉岩土力学研究所国家重点实验室开发课题:网纹红土的流变性研究(Z110702)

摘　　要：为研究洞庭湖地区典型网纹红土的单向固结特性和规律,分别取原状土样和扰动土样在不同的荷载下进行单轴固结实验。分析实验结果表明:原状网纹红土的压缩性比扰动土低很多;在次固结阶段,原状土样的蠕变曲线不平滑,且没有明显的稳定蠕变阶段,而扰动土样的蠕变曲线平滑,有明显的稳定蠕变阶段;原状土样达到变形稳定所需时间比扰动土样短的多。研究还发现非饱和网纹红土的单向固结存在线性规律,并推导出其单向固结经验方程,方程中的一个参数可用于准确预测网纹红土单向固结的最终沉降量。To research the uniaxial consolidation property of the typical reticulate red clay around Dongting lake area, uniaxial consolidation tests were performed on the undisturbed and disturbed sample under different vertical pressure. By analyzing the laboratory results, the authors drew following conclusions： the compressibility of undisturbed sample is much more insignificant than that of disturbed sample;in secondary consolidation stage, the creep curves of undisturbed sample is rough, and the undisturbed sample has no obvious steady creep stage, while the creep curves of disturbed sample are smooth and there is obvious steady creep stage in disturbed sample;the undisturbed sample comes to the end of creep deformation much earlier. The authors also found that uniaxial consolidation of unsaturated reticulate red clay has the linear rule, and the authors deduced a empirical equation of uniaxial consolidation, a parameter in this equation can help us forecast the ultimate settling amount of reticulate red clay.

关 键 词：网纹红土 单向固结 蠕变特性 经验方程 

分 类 号：TU45[建筑科学—岩土工程]