{"title":"Mechanism of air-boosting and its effects on vacuum consolidation","authors":"Jinchun Chai , Yafei Qiao , Wenqi Ding , Hehua Zhu","doi":"10.1016/j.geotexmem.2024.02.002","DOIUrl":null,"url":null,"abstract":"<div><p>This study aimed to address some basic issues about an air-boosting vacuum consolidation. Through theoretical analysis, it has been clarified that air-boosting pressure is not a consolidation pressure, and the efforts for developing a consolidation theory considering the effect of air-boosting pressure are unnecessary ones. Air-boosting can cause pneumatic fracturing in a soil mass, and equations for estimating the minimum air pressure required have been newly derived based on cavity expansion theories. Then, effects of air-boosting on a vacuum consolidation have been identified as: de-structuring, dewatering, and mitigating apparent clogging around drains. Then, by analyzing some published data of laboratory model tests using clay slurries, it is shown that mitigating apparent clogging contributed to about 30%–60% of the effect of air-boosting (increase settlement), and other part could be the effect of dewatering. Increase air pressure and duration of air-boosting had positive effects on both mitigating apparent clogging and dewatering, but might be more effect on dewatering.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 554-561"},"PeriodicalIF":4.7000,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geotextiles and Geomembranes","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0266114424000141","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This study aimed to address some basic issues about an air-boosting vacuum consolidation. Through theoretical analysis, it has been clarified that air-boosting pressure is not a consolidation pressure, and the efforts for developing a consolidation theory considering the effect of air-boosting pressure are unnecessary ones. Air-boosting can cause pneumatic fracturing in a soil mass, and equations for estimating the minimum air pressure required have been newly derived based on cavity expansion theories. Then, effects of air-boosting on a vacuum consolidation have been identified as: de-structuring, dewatering, and mitigating apparent clogging around drains. Then, by analyzing some published data of laboratory model tests using clay slurries, it is shown that mitigating apparent clogging contributed to about 30%–60% of the effect of air-boosting (increase settlement), and other part could be the effect of dewatering. Increase air pressure and duration of air-boosting had positive effects on both mitigating apparent clogging and dewatering, but might be more effect on dewatering.
期刊介绍:
The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident.
Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.