干旱地区非饱和路基土湿度的气候依赖性

Climate Dependency of Unsaturated Subgrade Soils Moisture in Arid Regions

为探究干旱地区非饱和路基土的湿度与气候的关系展开了相应研究。该项研究从干旱或半干旱地区在役路基现场湿度调研着手,揭示路基土含水率在深度方向的分布规律;选择基质吸力表征路基湿度,引入综合湿度指数n_(tmi)表征气候因素。其次,根据不同土组,构建反映两者关联的n_(tmi)简化模型,用以通过气候数据预估路基平衡湿度。最后,利用调研数据对模型进行了验证,研究结果表明:所构建的气候效应模型在定量表达气候因素对干旱地区路基湿度的影响方面比地下水位模型更为精确。

In order to explore the relationship between the humidity of unsaturated subsoil and climate in arid regions,a series of tests have been done in this paper. Along with field investigation of subgrade moisture in typical areas of arid regions,we derived the distribution law for moisture of subgrade soils in depth direction. Then Thornthwaite Moisture Index（ TMI） has been taken as representation of climate factors with matric suction selected to express subgrade moisture and climatic effect model has been established to reveal relationship between TMI and matric suction according to soils type. Finally,the acceptance of climatic effect model is verified by the data of field investigation. The results show that climatic effect model is more precise than groundwater table model in quantitative expression of influence of environment factors on subgrade moisture for aridity regions.