Experimental study on vacuum preloading combined with intermittent airbag pressurization for treating dredged sludge

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-11-16 DOI:10.1016/j.geotexmem.2024.11.001

Yajun Wu , Jinjin Wu , Yitian Lu , Xudong Zhang , Chau Nguyen Xuan Quang

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Abstract

The PVD-vacuum preloading method combined with airbags is a new soft ground treatment technology that can provide additional consolidation pressure and reduce lateral deformation towards the improvement area caused by traditional PVD-vacuum preloading. However, continuous airbag pressurization tends to create large cavities in the soil, and the optimal timing for airbag loading is also unclear. To address the aforementioned issues, this paper proposes an intermittent airbag pressurization method, adding small-diameter airbags between adjacent PVDs and intermittently inflating the airbags. Through indoor model test, the water discharge characteristics, improvement effect, improvement mechanism, and foundation settlement characteristics under intermittent airbag pressure were studied, proving that intermittent airbag pressure can significantly reduce early soil rebound. A calculation method for the airbag expansion diameter was proposed, and its feasibility was verified through experimental results. Finally, the optimal time period for intermittent airbag loading was clarified.

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真空预加载与间歇气囊加压相结合处理疏浚污泥的试验研究

结合气囊的 PVD 真空预加载法是一种新型软土地基处理技术，可提供额外的固结压力，减少传统 PVD 真空预加载法对改良区域造成的横向变形。然而，连续的气囊加压容易在土壤中产生较大的空洞，而且气囊加载的最佳时机也不明确。针对上述问题，本文提出了一种间歇式气囊加压方法，即在相邻 PVD 之间添加小直径气囊，并对气囊进行间歇式充气。通过室内模型试验，研究了间歇气囊加压下的出水特性、改善效果、改善机理和地基沉降特性，证明间歇气囊加压可显著减少早期土体回弹。提出了气囊膨胀直径的计算方法，并通过试验结果验证了其可行性。最后，明确了间歇气囊加载的最佳时间段。

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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.