膨胀土大型渗透试验研究  

Study on Large-scale Permeability Test for Expansive Soil

作　　者：宋卫康[1] 丁文其[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《路基工程》2013年第4期20-23,共4页Subgrade Engineering

基　　金：国家高技术研究发展计划(2012AA112502)

摘　　要：膨胀土大型的渗透试验用渗透箱进行,研究了在渗透过程中土体体积含水量、总吸力、相对湿度和表面竖向位移的变化,并根据试验结果得到了体积含水量与吸力的关系。研究结果表明:体积含水量和相对湿度均随着渗透时间的增加而增大,其变化过程与所处位置有关;土体吸力随着渗透时间的增加而减小;降雨入渗可能造成路堤破坏;土体表面竖向位移逐渐增加,在中心位置处达到最大值;土体体积含水量与吸力在半对数坐标下大致呈线性关系。Large-scale permeability test for expansive soil is conducted in a penetration box with the study of the changes in relation to volumetric water content, total suction, relative humidity, and surface vertical dis- placement, through which the relation between the volumetric water content and the suction could be obtained. The results show that the volumetric water content and the relative humidity increase with the increase of penetration time and the change process relates to the position; however, the soil suction decreases with the increase of penetration time; rainfall infiltration may damage the embankment; the soil surface vertical displacement increases gradually and may reach the peak at the central position; the volumetric water content and the suction of the soil mass present, in semilogarithmic coordinates, a linear relationship.

关 键 词：膨胀土 大型 渗透试验 总吸力 体积含水量 

分 类 号：TU411[建筑科学—岩土工程]