渗漏对非饱和膨胀土地基变形的影响

渗漏会引起非饱和膨胀土地基中的水分迁移,由此导致工程病害。目前对渗水增湿过程及增湿变形尚难预测。首先对膨胀土地基渗水增湿过程进行理论分析,针对地基渗水增湿的变形过程,建立了二维膨胀土积水入渗模型,该模型揭示了膨胀土地基非饱和增湿过程。经计算得到膨胀土地基含水量变化后,根据含水量的变化,选择分层总和法计算膨胀土增湿变形量。通过分析增湿过程中膨胀土的变形特性,得到了膨胀土在逐级增湿时的变形发展过程。并经实例计算,验证了入渗增湿计算模型及增湿变形计算方法的可行性和合理性。

Influence of Seepage on the Deformation of Unsaturated Expansive Soil Ground

Moisture migration takes place in unsaturated expansive soil because of the leakage water,and it leads to the disease of project.It is still difficult to predict the change of moisture content and the water-increased deformation in the expansive ground resulted from water seepage.First the change of moisture content in expansive ground was theoretically analyzed,then a two-dimensional model of accumulated water seepage was established in expansive soil.This discovers unsaturated water-increased phenomenon after the change of water content in expansive ground is got.Furthermore,according to the water content,layer-wise summation method was used to calculate the settlement of ground.By studying the deformation characteristics of expansive soil in the process of humidification,the procedure of the deformation development of the expansive soil is better understood when the moisture content of the expansive soil increases in steps until it is saturated.Finally,the model of water seepage and the calculation method of water-increased deformation are verified to be feasible and reasonable by comparing calculated data with the test data.