Vacuum preloading has been widely used to improve soft soils in coastal areas of China.An increasing amount of evidence from field operations has shown that conventional vacuum preloading is prone to clogging in prefabricated vertical drains (PVDs) and demands a large volume of sand fills.In recent years,air-boosted vacuum preloading has been developed to overcome these limitations;however,this method still requires more data to verify its performance.In this study,a field test for air-boosted vacuum preloading was conducted,and a large-strain two-dimensional (2D) finite element (FE) model was developed and validated against the field test data.Then,a series of FE parametric analyses was per-formed to assess key factors,i.e.the air injection pressure,the injection spacing,and the characteristics of cyclic injection,which affect the performance of the air-boosted vacuum preloading.The results showed that the ground settlement and lateral displacement of the soils increased due to an increase in the injection pressure,a decrease in the injection spacing,or increases in the number and duration of the injection cycles.Based on the parametric analyses,an empirical formula for ground settlement prediction was proposed and compared with a case history reported in the literature,showing good agreement.

Shuangxi Feng;Huayang Lei;Cheng Lin

Department of Civil Engineering,Tianjin University,Tianjin,300354,China;Key Laboratory of Coast Civil Structure Safety of the Ministry of Education,Tianjin University,Tianjin,300354,China;Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-Rural Seismic Resilience,China Earthquak Administration,Tianjin,300354,China;Department of Civil Engineering,University of Victoria,Victoria,BC,V8P 5C2,Canada

岩石力学与岩土工程学报（英文版）

[1]Shuangxi Feng;Huayang Lei;Cheng Lin-.Analysis of ground deformation development and settlement prediction by air-boosted vacuum preloading)[J].岩石力学与岩土工程学报（英文版）,2022(01):272-288

preloading,drains,PVDs

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