大气作用下非饱和黄土路基湿度变化及影响因素研究  

Study on humidity variation and influence factors of unsaturated loess subgrade under atmospheric pressure

作　　者：孙金龙 

机构地区：[1]中铁西安勘察设计研究院有限责任公司,陕西西安710054

出　　处：《内蒙古公路与运输》2017年第3期9-13,共5页Highways & Transportation in Inner Mongolia

基　　金：甘肃省自然科学基金项目(1506RJZA030)

摘　　要：以西北地区的黄土路基为研究对象,以夏秋季节大气作用下的降雨—蒸发作用对路基湿度场、温度场以及变形的循环作用机理为研究目的,采用室内物理力学试验、人工填筑模型试验等多种研究方法,详实展开了降雨—蒸发循环作用下非饱和黄土路基土体含水率、温度、孔隙水压力以及变形的动态响应规律和稳定性研究;并对不同大气作用下,路基土体湿度场、温度场以及横向变形的变化规律和影响因素进行分析。发现非饱和黄土路基边坡在降雨入渗过程中,对应着一个临界入渗强度,路基边坡的表层土体含水率的变化比较明显,中雨对路基土体湿度变化的影响深度最大,路基不同位置土体含水率受到影响的程度不尽相同,非饱和黄土路基中水分的入渗速度要大于蒸发速度。In this paper, the loess roadbed in the northwest region is the main research object, and in order to study the mechanism of the rainfall and evaporation under the action of the atmosphere in the summer and autumn periods, the dynamic response law and stability of soil moisture content, temperature, pore water pressure and deformation of unsaturated loess roadbed under rainfall - evaporation cycle were studied by using various methods such as indoor physical mechanics test and artificial filling model test, then the variation law and influencing factors of humidity field, temperature field and lateral deformation of subgrade soil under different atmospheric effects are analyzed. It is found that the soil infiltration intensity of the subgrade slope is relatively obvious during the process of rainfall infiltration, and the influence of the medium rain on the humidity change of the subgrade soil is the largest. The degree of water infiltration in different soils is different. The infiltration rate of water in unsaturated soil loess is higher than that of evaporation.

关 键 词：非饱和黄土 降雨入渗 日照蒸发 路基 含水率 温度 

分 类 号：TU444[建筑科学—岩土工程]