Mechanism of air-boosting and its effects on vacuum consolidation

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-02-27 DOI:10.1016/j.geotexmem.2024.02.002

Jinchun Chai , Yafei Qiao , Wenqi Ding , Hehua Zhu

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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.

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增气机制及其对真空固结的影响

本研究旨在解决有关空气增压真空固结的一些基本问题。通过理论分析，阐明了空气增压并不是固结压力，因此开发考虑空气增压效应的固结理论是不必要的。空气增压会导致土体气动破裂，根据空腔膨胀理论，新推导出了估算所需的最小空气压力的方程。然后，确定了空气增压对真空固结的影响：去结构、脱水和减轻排水沟周围的明显堵塞。然后，通过分析一些已公布的使用粘土泥浆进行实验室模型试验的数据，表明减轻表观堵塞约占空气增压效应（增加沉降）的 30%-60%，其他部分可能是脱水效应。增加空气压力和延长空气增压时间对减轻表观堵塞和脱水都有积极影响，但对脱水的影响可能更大。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

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.