【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。更多还原

【Abstract】 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.更多还原