膨胀土膨胀力的改进测定及其规律研究

通过改进的测试手段,对膨胀土膨胀力与初始含水量、初始干密度和竖向压力的相关关系及其对各因素的敏感性进行研究。结果表明,在800kPa范围内,膨胀土的膨胀力随初始干密度的增大而增加,随初始含水量和竖向压力的增大而减小;膨胀力与初始干密度和初始含水量几近呈线性关系,而与竖向压力呈半对数线性关系;影响膨胀力发挥的最大因素是干密度,其次为含水量,最后为竖向压力。

RESEARCH ON MEASUREMENT AND LAW OF SWELLING FORCE OF EXPANSIVE SOILS BY IMPROVED EXPERIMENT

By improved experiment,the swelling pressure test of expansive soils has been carried out with respect to initial variations in dry densities,water contents and vertical pressures.Correlation of swelling pressures to percents swell,dry densities,water contents and vertical pressures have been studied.Results indicate that the swelling pressure vs.percent swell can be taken as linearly related up to about a swelling pressure of 800 kPa;the swelling pressures increase with increase in initial densities while decrease with increase in water contents and vertical pressures.By means of regression analysis,both the swell pressure-initial density relationship and the swell pressure-initial water content relationship are approximately linear,while the swelling pressure-vertical pressure relation is a semi-logarithm linear one.The most sensitive factor to the changes of swelling pressure is the dry density,then the water content and the last the vertical pressure.