Finite Element Analysis of Vertical and Horizontal Drainage Structures under Vacuum Combined Surcharge Preloading
Open Access
- 27 November 2021
- journal article
- research article
- Published by Hindawi Limited in Advances in Civil Engineering
- Vol. 2021, 1-11
- https://doi.org/10.1155/2021/9448436
Abstract
Finite Element Analysis of Vertical and Horizontal Drainage Structures under Vacuum Combined Surcharge Preloading: Combined vacuum and surcharge preloading has gradually been widely used because of its advantages of low cost, green environmental protection, and good treatment effect. The conventional prefabricated vertical drain presents obvious defects in vacuum preloading treatment, such as obvious silting, serious bending of the drainage board, large attenuation of vacuum degree of drainage board along the depth, long construction period, and so on, which affect the final reinforcement effect. In this paper, the MIDAS finite element simulation of combined vacuum and surcharge preloading of prefabricated vertical drains (PVDs) and prefabricated horizontal drains (PHDs) is established through the comparative experiment of the engineering field. The comparative experimental study is carried out from the aspects of the vertical settlement, horizontal displacement, and pore water pressure. The results show that under combined vacuum and surcharge preloading, the consolidation effect of soft soil with PHDs is better than that with PVDs. When PHDs are used, the vertical settlement increases by 7.2 compared with PVDs; the horizontal displacement is larger; and the pore water pressure dissipates faster. This is because when the PHDs are adopted, the consolidation direction of the soil is consistent with the direction of the vacuum suction, which is mainly caused by vertical settlement. With the consolidation, the spacing between PHDs is gradually shortened, and the drainage distance is reduced, which can effectively reduce the consolidation time and improve the reinforcement effect of the soil. In addition, the PHDs can move downward uniformly with the soil during the consolidation process and have almost no bending deformation, which makes the vacuum transfer more uniform and effective.Keywords
Funding Information
- National Natural Science Foundation of China (51978177)
This publication has 15 references indexed in Scilit:
- A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effectsComputers and Geotechnics, 2020
- Predicting deformation of PVD improved deposit under vacuum and surcharge loadsGeotextiles and Geomembranes, 2019
- A nonlinear attachment-detachment model with adsorption hysteresis for suspension-colloidal transport in porous mediaJournal of Hydrology, 2019
- Indoor simulation test of step vacuum preloading for high-clay content dredger fillMarine Georesources & Geotechnology, 2017
- Vacuum dewatering and horizontal drainage blankets: a method for layered soil reclamationBulletin of Engineering Geology and the Environment, 2009
- Vacuum consolidation and its combination with embankment loadingCanadian Geotechnical Journal, 2006
- Ground Deformation Induced by Vacuum ConsolidationJournal of Geotechnical and Geoenvironmental Engineering, 2005
- Numerical modeling of vacuum preloading and field applicationsCanadian Geotechnical Journal, 2004
- Vacuum preloading consolidation of Yaoqiang Airport runwayGéotechnique, 2000
- Layered Clay‐Sand Scheme of Land ReclamationJournal of Geotechnical Engineering, 1987