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| Theoretical model of water movement and wetting-induced deformation for remolded loess under one-dimensional loading-wetting condition and its experimental verification |
| HU Haijun1，WANG Chen1，LV Tongyang1，LI Bopeng1，2 |
(1. College of Water Resources and Architectural Engineering，Northwest A&F University，Yangling，Shaanxi 712100，China；
2. China Construction Third Bureau Green Industry Investment Co.，Ltd.，Wuhan，Hubei 430100，China) |
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Abstract 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.
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2022, Vol. 41 
