A settlement calculation method for soft ground subjected to air-boosting vacuum preloading

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2025-08-28 DOI:10.1016/j.geotexmem.2025.08.005

Fang Xu , Wenqian Hao , Qichang Wu , Junfang Yang , Qi Yang

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引用次数: 0

Abstract

The air-boosting vacuum preloading (AVP) method effectively enhances the treatment performance of soft ground compared to conventional vacuum preloading. The air-boosting mechanism primarily exerts dewatering, de-structuring, and mitigating apparent clogging around drains, among which the dewatering is closely related to variations in pore water pressure within the soil. Through systematic analysis of pore water pressure variations during the preloading process, a computational framework for quantifying settlement increments induced by dewatering effect is established. By integrating the proportional contribution of dewatering to the total air-boosting effects, the settlement amplification mechanism attributable to air-boosting was characterized. These findings, in conjunction with vacuum consolidation theory, culminated in the development of a settlement calculation method for AVP-treated soft ground. The proposed method was validated through its application to two case histories, demonstrating favorable computational efficiency and satisfactory alignments between predicted and measured settlements. It also effectively reflects the evolution of ground settlement under air-boosting. Furthermore, the variations of the soil e-lg(p) compression curve under AVP treatment were investigated, facilitating the identification of an approximate shifted e-lg(p) curve. Finally, the primary factors affecting the settlement of AVP-treated soft ground were clarified. These findings offer valuable insights for the analysis and design of AVP-treated soft ground.

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增压真空预压软土地基沉降计算方法

与传统的真空预压相比，增压真空预压法有效地提高了软土地基的处理性能。空气增压机制主要发挥排水、去结构和缓解排水周围明显堵塞的作用，其中排水与土壤孔隙水压力的变化密切相关。通过系统分析预压过程中孔隙水压力的变化，建立了量化脱水沉降增量的计算框架。通过综合降水对总增压效应的比例贡献，表征了增压沉降放大机理。这些发现，结合真空固结理论，最终发展了avp处理软土地基的沉降计算方法。通过对两个历史案例的应用验证了所提出的方法，证明了良好的计算效率和预测与实测沉降之间令人满意的一致性。它也有效地反映了空气助推作用下地面沉降的演变过程。此外，研究了AVP处理下土壤e-lg(p)压缩曲线的变化，有助于识别近似移位的e-lg(p)曲线。最后，明确了影响avp处理软土地基沉降的主要因素。这些发现为avp处理软土地基的分析和设计提供了有价值的见解。

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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.