Numerical investigation of liquefaction mitigation potential with vibroflotation
Journal
Soil Dynamics and Earthquake Engineering
Journal Volume
146
Start Page
106736
ISSN
02677261
Date Issued
2021
Author(s)
Abstract
Vibroflotation is one type of ground improvement technique used for liquefaction mitigation in saturated sand. In order to study the feasibility of vibroflotation for liquefaction mitigation, two numerical models were created in the finite element framework. A nonlinear, coupled, hypoplastic u-p formulation was developed to simulate the behaviour of saturated sand. Numerical results were validated against on-field cone penetration test measurements after vibroflotation and centrifuge test simulating seismic site response of saturated sand. Seismic site response of saturated sand before and after vibroflotation was analysed. Saturated loose sand with fines and lower permeability underwent excess pore pressure generation, softening, and possibly liquefaction under seismic loading before vibroflotation. Sands with higher permeability were found to respond better to vibroflotation. The most effective degree of compaction was achieved in dry sands. Vibroflotation of saturated sand with fines ensured improved resistance against liquefaction whereas for coarse sands it led to complete eradication of the liquefaction. © 2021 Elsevier Ltd
Subjects
CEL
Centrifuge tests
FEM
Liquefaction
Saturated sand
Vibroflotation
Publisher
Elsevier Ltd
Description
論文編號: 106736
Type
journal article