考虑压力和密度影响的膨胀土增湿变形研究

Study on Humidification Deformation of Expansive Soil Considering the Influence of the Pressure and Density

基于考虑初始含水量、上覆压力、初始干密度影响,研究了膨胀土竖向增湿变形问题,得到了膨胀土膨胀变形的规律,揭示出相同初始含水量时,初始干密度越大膨胀率越大;相同初始干密度时,初始含水量越大膨胀率越小;其他条件相同时上覆压力越大膨胀率越小。文章还总结出考虑初始含水量、上覆压力、初始干密度影响的膨胀率回归方程,提出用有限的试验数据得到任意组合条件的膨胀率计算方法。由此可进一步求得膨胀土地基的膨胀变形量,为工程计算提供可靠的理论依据。

Based on the influence of initial water content, pressure and initial dry density of expansive soil, the vertical humidification deformation is studied. The rules of deformation of expansive soil are obtained. Revealing that the expansion rate is higher when there is more initial dry density with the same initial water content, and it is lower when there is a greater water content with the same initial dry density; and the expansion rate is lower when there is a greater overlying pressure with other conditions the same. Then the regression equation of expansion rate is summarized based on the influence of initial water content, pressure and initial dry density. The calculation of expansion rate by any combination of conditions is proposed based on the limited test data. And in further we can find the expansion deformation of the expansive soil ground to provide the reliable theoretical basis for engineering calculation.