振冲密实法处理吹填地基的两个关键技术问题

Two key technical issues of vibroflotation compaction for hydraulic-filled foundation treatment

应用振冲密实法处理大面积吹填砂地基时,常会遇到两个关键技术问题:1)如何将疏浚吹填料的细粒含量控制在15%以内;2)深层水下地基处理时难以一次振冲至目标深度。为此,结合2个海外振冲地基处理工程,开展技术对策研究。检测结果表明:所提技术对策能较好地解决上述振冲密实处理吹填地基的关键技术问题。

When applying the vibroflotation compaction method to treat the large-area hydraulic filled sand foundation,two key technical problems are encountered:1)How to control the clay content of the reclamation material until less than 15%;2)It is difficult to achieve the target depth once during deep underwater vibroflotation.So,combining with two overseas projects,we carry out a research on corresponding technical countermeasures.The test results show that the proposed technical countermeasures can better solve the key technical problems.