非饱和黄土场地水分入渗规律及影响因素的现场试验与数值模拟

为了探究非饱和黄土场地水分入渗规律及其影响因素,为黄土地区因水分入渗作用导致的各类滑坡和工程地质灾害研究提供参考。在非饱和黄土场地现场开展水分入渗试验,获得不同深度水分计监测信息,探讨非饱和黄土场地水分运移规律；结合数值模拟扩展研究不同浸水类型及不同浸水量对水分入渗规律的影响。结果表明：不同深度土体的体积含水率随时间关系曲线呈现出四个阶段变化特征,区别在于各阶段时间的长短和体积含水量峰值的大小；非饱和入渗时,渗透扩散速率随着深度的增加逐渐衰减,且衰减速率较大；不同浸水类型的入渗深度及宽度在短时间内会存在差异,对最终入渗深度及宽度并没有影响；随着浸水量的增加,入渗深度和宽度不断增加,但增加幅度不断减小,非饱和黄土场地水分入渗深度及宽度是有限的。

Field Test and Numerical Simulation of Water Infiltration Law and Influencing Factors of Unsaturated Loess Site

To Study on water infiltration law and influencing factors of unsaturated loess site and provide reference for the study of various landslide and engineering geological disasters caused by water infiltration in loess area. Water infiltration test was carried out in the unsaturated loess site to obtain the information of moisture meter in different depth and explore the water movement law in unsaturated loess site. Combined with the expansion of numerical simulation, the influence of different water immersion types and different water immersion amount on water infilt ration law were studied. The result shows the curve of volume moisture content with time in different depths develops in four stages, the difference is the length of time and the peak value of volume moisture content. In unsaturated infiltration, the infiltration rate decreases with the increase of depth and the decay rate is larger. The infiltration depth and width of different immersion types are different in a short time, but have no difference to the final infiltration depth and width.With the increase of water immersion amount, the depth and width of infiltration are increasing, but the increasing range is decreasing. The infiltration depth and width of unsaturated loess site are limited.