期刊论文

Experimental study on relationship among matric suction and moisture content and gradation of unsaturated coarse grained soil

Zeng, X.

中文

中南大学学报(自然科学版)

1672-7207

2019

50

3

712-718

10.11817/j.issn.1672-7207.2019.03.026

51678073:国家自然科学基金 51508042:国家自然科学基金 51838001:国家自然科学基金

本校为通讯机构

为了研究非饱和粗粒土基质吸力与含水率及级配之间的关系,通过控制曲率系数和不均匀系数配制5种不同级配的粗粒土土样,采用自行设计的模型装置进行降雨入渗试验,并根据试验结果绘制基质吸力与含水率关系拟合曲线,得到满足试验条件的函数关系式,从而得到土-水特征曲线方程。研究结果表明:不均匀系数越大,土样初始含水率越小,达到饱和状态时含水率越小,且土样达到饱和所需的时间越长;随着脱水过程的进行,土样不均匀系数越大,其含水率的下降速度越慢,残余含水率也越大;初始基质吸力随着土样不均匀系数增大而不断提高,同时,土样的残余基质吸力随着不均匀系数增大而增大;利用Van Genuchten模型对实测...

In order to study the relationship among matric suction and moisture content and gradation of unsaturated coarse grained soil, five kinds of coarse-grained soil samples with different gradations were prepared by controlling curvature coefficient and non-uniform coefficient. The rainfall infiltration test was conducted using a self-designed model device. The fit curves of moisture content with matrix suction were plotted based on the experimental results, and the functional relationship under the experimental conditions was obtained. The results...