Analysis of ground deformation development and settlement prediction by air-boosted vacuum preloading

作     者：Shuangxi Feng Huayang Lei Cheng Lin Shuangxi Feng;Huayang Lei;Cheng Lin

作者机构：Department of Civil EngineeringTianjin UniversityTianjin300354China Key Laboratory of Coast Civil Structure Safety of the Ministry of EducationTianjin UniversityTianjin300354China Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-Rural Seismic ResilienceChina Earthquak AdministrationTianjin300354China Department of Civil EngineeringUniversity of VictoriaVictoriaBCV8P 5C2Canada 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2022年第14卷第1期

页      面：272-288页

核心收录：

学科分类：08[工学] 081401[工学-岩土工程] 0818[工学-地质资源与地质工程] 0814[工学-土木工程] 

基　　金：the National Key Research and Development Program of China(Grant No.2017YFC0805402) the Tianjin Construction Commission Science and Technology Project(financial support No.2017E6-0015) the China Scholarship Council(CSC)(Grant No.201906250153)for their Grant of the study in this paper。 

主　　题：Air-boosted vacuum preloading Field test Numerical modeling Settlement Soft soils Ground improvement 

摘      要：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 performed to assess key factors,i.***.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.