摘要
针对黄土载荷浸水情况下水分运移和湿陷变形会产生相互影响,构建一维情况下考虑二者相互影响的水分入渗和增湿变形计算模型,并给出确定模型参数的方法。为验证模型的可靠性,采用自制一维土柱渗透仪进行兰州重塑黄土一维载荷浸水试验,通过室内单元试验获取模型参数,应用模型对载荷浸水试验中水分入渗过程和湿陷变形过程进行预测,对比了预测值和实测值,并对模型参数进行分析和反演。结果表明:建立的模型能合理预测随压力增加浸润锋前进速率降低的规律,并能准确预测湿陷变形随浸润锋深度的变化;考虑到端部绝对饱和区、大孔隙流以及模型中的假定,反演了等效饱和体的饱和渗透系数和锋面吸力水头,反演的参数分别与单元试验所确定的参数在随压力的变化规律上相同、数值上相近,说明模型具有合理性,反演的参数为模型的应用提供了参考依据。
The water movement and the collapse deformation development in loess under one-dimensional loading-wetting condition influence each other. A model for predicting water movement and wetting-induced deformation considering their interactions was proposed and the corresponding method of determining the model parameters was given. In order to verify the reliability of the model,one-dimensional load-wetting tests on remolded Lanzhou loess soil were carried out by using a self-made one-dimensional soil column infiltration instrument,and the model parameters were obtained through the indoor element tests. The model was applied to predict the water movement process and the collapse deformation development in the loading-wetting tests. The predicted and measured values were compared,and the model parameters were analyzed and inversed. The results show that the established model can reasonably predict the decrease of the rate of wetting front advancing with the applied vertical pressure and the relation between the collapse deformation and the depth of wetting front.Considering fully saturated zone at the end of soil column,flow in macropores and the assumption in the model,the saturated permeability coefficient of the equivalent saturated body and the effective suction head at wetting front were inversed. The laws of the two inversed parameters changing with the vertical pressure are the same as those determined by indoor element tests with close values respectively,which indicates that the model is reasonable. The inversed parameters provide reference for the application of the model.
作者
胡海军
王晨
吕彤阳
李博鹏
HU Haijun;WANG Chen;LV Tongyang;LI Bopeng(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;China Construction Third Bureau Green Industry Investment Co.,Ltd.,Wuhan,Hubei 430100,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2022年第5期1020-1030,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金资助项目(51409220)
陕西省自然科学基础研究计划项目(2021JM–107)
中央高校基本科研业务费专项资金项目(2014YB049)。
关键词
土力学
重塑黄土
载荷浸水
入渗
湿陷变形
soil mechanics
remolded loess
loading-wetting
infiltration
collapse deformation
