非饱和土边坡在相对高吸力条件下与降雨相关的渗透行为特征  

Permeability Behavior of Unsaturated Soil Slope under Relatively High Suction Conditions Related to Rainfall

作　　者：贾豫蓉 邵云海 李育红 Jia Yurong;Shao Yunhai;Li Yuhong(Yunnan Architectural Engineering Design Institute Co.,Ltd.;Yunnan Construction Investment First Survey and Design Co.,Ltd.)

机构地区：[1]云南省建筑工程设计院有限公司,昆明市650000 [2]云南建投第一勘察设计有限公司,昆明市650000

出　　处：《勘察科学技术》2024年第3期1-7,27,共8页Site Investigation Science and Technology

摘　　要：该文根据双渗透模型,将孔隙发育的土壤在相对高吸力条件下的吸水和排水过程中体积含水率和孔隙压力的变化分为大孔隙和基质行为进行了深入研究。结果表明,在降雨开始时体积含水率低于土壤持水量且孔隙压力低于相应值的区域,计算了土壤持水量最大值处基质流的临界排水曲线;沿临界排水曲线状态下的吸水排水过程与测试曲线相对应。此外,当大孔隙流动发生时,体积含水率和孔隙压力的分布变得极不均匀,即使将测量仪器数值设置为0.4m的间距,计算出的体积含水率和孔隙压力的同步性也被损坏,在研究测量结果时必须考虑测量间隔的影响。Based on the dual-permeability model,the changes of volumetric water content and pore pressure in the process of water absorption and drainage of soil with well developed pores under relatively high suction conditions are divided into macropore and matrix behaviors in this paper.The results show that the critical drainage curve of matrix flow at the maximum soil water retention is calculated in the region where the volume water content and pore pressure are lower than the corresponding value at the beginning of rainfall.It is shown that the process of water absorption and drainage along the critical drainage curve corresponds to the test curve.In addition,when the macropore flow occurs,the distribution of volumetric water content and pore pressure becomes highly uneven,even if the measurement instrument value is set to O.4m intervals,the synchronization of the calculated volumetric water content and pore pressure is also damaged.Therefore,the influence of the measurement interval must be considered when studying the measurement results.

关 键 词：原位试验 不饱和度 降雨 孔隙 土水特征曲线 

分 类 号：TU43[建筑科学—岩土工程]