增压式真空预压法加固海相吹填土现场试验研究

为进一步推动真空预压法在海相吹填土地基中的应用,克服其自身的局限性,探讨增压在真空预压法中所起到的作用,依托温州某吹填工程开展现场试验研究,包括增压式真空预压法和常规真空预压法的现场对比试验,对现场的膜下真空度、表层沉降进行了分析,重点研究加固后增压式真空预压处理后的地基承载力的变化规律和加固效果,并与常规真空预压法进行对比。结果表明显:增压式真空预法加固效果明显,土体深层次承载力有一定程度提高,尤其在吹填面以下1.5~3 m的范围内增压区比常规真空预压区土体强度高。

Field tests on marine dredger fill foundation by air-boosted vacuum preloading

In order to increase the application of vacuum preloading in large dredger fill foundation, overcome its own limitations, and to explore the role of air-boost in vacuum preloading, field tests on improvement technology were performed based on a soft foundation filled in Wenzhou including field comparison tests of air-boosted vacuum preloading and conventional vacuum preloading. The vacuum pressure and surface settlement are analyzed and the changes of bearing capacity of reinforced foundation after air-boosted vacuum preloading and the reinforcement effect are studied mainly, which were compared with conventional vacuum preloading method. The results show that the reinforcement effect of air-boosted vacuum preloading is obvious, and the deep bearing capacity of soil is improved to some extent, especially in the range of 1.5m ~ 3m below the blowing surface.