初始含水率对三趾马红土失水收缩特性影响  

Effect of Initial Moisture Content on the Shrinkage Characteristics of the Red Soil of Hipparion

作　　者：杜长城 祝艳波[1] 苗帅升 高明明 祝俊华 赵法锁[1] DU Changcheng;ZHU Yanbo;MIAO Shuaisheng;GAO Mingming;ZHU Junhua;ZHAO Fasuo(College of Geological Engineering and Geomatics,Chang′an University,Xi′an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《水土保持研究》2019年第1期227-233,共7页Research of Soil and Water Conservation

基　　金：国家自然科学基金"受三趾马红土控制的黄土滑坡滑带土的非饱和蠕变特性研究"(41502278);陕西省自然科学基金资助项目"黄土-三趾马红土接触面滑坡异质滑带的剪切力学特性研究"(2017JQ4021)

摘　　要：三趾马红土胀缩特性明显,其失水收缩开裂对天然斜坡和工程边坡稳定性影响显著。利用设计的试验监测装置,开展不同初始含水状态三趾马红土重塑样的干燥脱湿试验,并运用数字图像定量处理技术获得试样干缩变形的动态定量数据,得到以下结论:(1)三趾马红土试样失水曲线呈现明显的3个阶段:快速失水期、减速失水期和残余失水期,且失水曲线受初始含水率影响显著,初始含水率越大,试样失水速率相对越快,失水过程越剧烈;(2)三趾马红土试样收缩曲线呈现明显的4个阶段:快速收缩阶段、减速收缩阶段、残余收缩阶段和零收缩阶段,且收缩曲线受初始含水率影响显著,初始含水率越大,收缩过程越剧烈,最终径向收缩应变越大;(3)三趾马红土试样的最终收缩应变与初始含水率呈良好线性关系。The swelling and shrinkage characteristics of red soil of Hipparion were obvious,and the water shrinkage cracking had significant effect on the stability of natural slope and engineering slope.We used the designed test monitoring devices to carry out different initial moisture state hipparion red clay reshape sample drying dehumidifying test,and used digital image processing technology to obtain quantitative sample drying shrinkage deformation of dynamic quantitative data,and get the following conclusions.(1)The hipparion red soil specimen water loss curve presents obvious three stages:rapid water loss,slow water loss,and residual water loss,and water loss curve is significantly influenced by the initial moisture content,the greater the initial moisture content is,the faster the sample water loss rate is,and more intense filtration process is;(2)The hipparion red soil specimen contraction curve presents obvious four stages:rapid shrinkage phase,slow contraction phase and residual phase and zero contraction phase,and a significant contraction curve is influenced by the initial moisture content,the greater the initial moisture content is,the more intense the shrinkage process is,and the greater eventual radial shrinkage strain is;(3)The ultimate shrinkage strain and initial moisture content of the tri-toe horse red soil sample has the significantly linear relation.

关 键 词：三趾马红土 脱湿 干缩变形 含水率 数字图像定量处理 

分 类 号：TU44[建筑科学—岩土工程]