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.

中文翻译：

---

真空预压结合间歇式安全气囊加压处理疏浚污泥的实验研究


PVD 真空预紧法结合安全气囊是一种新型的软土处理技术，可以提供额外的固结压力，减少传统 PVD 真空预紧力对改善区域造成的横向变形。然而，连续的安全气囊加压往往会在土壤中产生大空洞，并且安全气囊加载的最佳时间也不清楚。针对上述问题，本文提出了一种间歇性安全气囊加压方法，在相邻的 PVD 之间增加小直径的安全气囊，并间歇性地给安全气囊充气。通过室内模型试验，研究了间歇性气囊压力下的排水特性、改良效果、改良机理和地基沉降特性，证明间歇性气囊压力能显著降低土体早期回弹。提出了一种气囊膨胀直径的计算方法，并通过实验结果验证了其可行性。最后，阐明了间歇性安全气囊加载的最佳时间段。