Civil and Project

Coupling Effect and Superposition Law in Soil Treatment Systems Incorporating Vacuum Preloading

https://doi.org/10.22034/cpj.2023.405822.1214
Volume 5, Issue 4 - Serial Number 50
July 2023
Pages 57-72
Civil and Project

Document Type : Research Article

Authors

Mohammad Mehdi Pardsouie 1
Seyed Mohammad Ali Zomorodian 2
Mehdi Mokhberi 2
Mohammad Hadi Pardsouie 3

1 Pars Geometry Consultants

2 Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran

3 Department of civil engineering, Estahban Branch, Islamic Azad University, Estahban, Iran

Abstract
In previous published literatures it was stated that superposition law might be valid for ground improvement techniques consisting of prefabricated vertical drains (PVDs) along with surcharge and vacuum preloading. Even some professional geotechnical engineers might think of this false idea that superposition law might be valid in such ground improvement techniques. It was shown that the superposition law is not valid because of the hydro-mechanical coupling interactions which exist between vacuum and surcharge preloading. A case history was presented and Finite Element Modeling (FEM) was used for verification and the demonstration of coupled consolidation interaction between vacuum and surcharge preloading. Three main parameters as settlement, lateral displacement, and water excess pore pressure were evaluated for different scenarios. The results that are based on a macro-element approach can be used for better comprehension of the working mechanism of combined treatment systems. Considering the results of this literature, a complex combined vacuum and surcharge preloading can be broken in simpler cases that can be used for either deriving analytical or empirical solutions.

Keywords

coupling
superposition
vacuum preloading
finite element modeling
excess pore pressure
  • Receive Date 14 May 2023
  • Revise Date 31 May 2023
  • Accept Date 19 June 2023
  • First Publish Date 22 June 2023
  • Publish Date 22 June 2023

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