Analysis of One-Dimensional Consolidation for Double-Layered Soil with Non-Darcian Flow Based on Continuous Drainage Boundary
Publication: International Journal of Geomechanics
Volume 23, Issue 3
Abstract
The boundary drainage performance controls the rate of pore water discharge in the soil and plays an important role in the prediction of soil consolidation and settlement. Based on a continuous drainage boundary that can reflect the change of boundary drainage performance with time, a one-dimensional consolidation model of double-layered soil considering non-Darcian flow is established. The finite-difference method and semianalytical method are used to solve the consolidation equation, and the reliability of the two methods is verified by comparing with existing solutions. Based on the proposed solution, the consolidation behaviors of the double-layered soil are explored in depth through a systematic parametric study. The results show that, if the time effect of drainage boundary and the influence of non-Darcian flow are ignored, the estimated consolidation rate is relatively fast in the whole consolidation stage. The non-Darcian flow has a greater influence on soil consolidation under the continuous drainage boundary condition compared with that under the traditional drainage boundary condition. The consolidation rate of the foundation can be improved by appropriately increasing the permeability of the underlying soil layer or decreasing the compressibility of the underlying soil layer.
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Acknowledgments
This research is supported by the National Natural Science Foundation of China (Grant Nos. 52178371, 52178321, 52108322, and 51878634), the Outstanding Youth Project of the Natural Science Foundation of Zhejiang Province (Grant No. LR21E080005), the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2018QNRC001), the Fundamental Research Funds for National University, China University of Geosciences (Wuhan) (Grant Nos. CUGGC09, 1910491T04). The China Postdoctoral Science Foundation Funded Project (Grant No. 2020M673093), the China Scholarship Council (CSC) (Grant No. 201906660001), and the Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Structural Safety (Grant Nos. 2019ZDK047 and 2019ZDK049) are also acknowledged.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
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Received: Mar 23, 2022
Accepted: Sep 21, 2022
Published online: Dec 21, 2022
Published in print: Mar 1, 2023
Discussion open until: May 21, 2023
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