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振冲法已比较成熟,但在受潮位影响的海底制桩则国外少见,国内是首次。我们设计了一套海上打设碎石桩的施工工艺,经实践证明是成功的,并且效率也较高。随后在海底进行了三组大型载荷试验,测得复合地基的容许承载力为130kPa,而天然地基为50kPa,复合地基为天然地基的2.6倍。 另外还测得应力分担比n=3。 上述经验与数据已在福州筹东电厂江堤中使用。
The vibroflotation method has been relatively mature, but the seafloor piles that are affected by the tide are rarely seen abroad, and it is the first time in China. We have designed a set of construction techniques for setting up gravel piles on the sea. The practice has proved to be successful and the efficiency is high. Subsequent three large-scale load tests were carried out on the sea bottom. The permissible bearing capacity of the composite foundation was measured to be 130 kPa, while that of the natural ground was 50 kPa, and the composite foundation was 2.6 times that of the natural foundation. In addition, the stress share ratio n=3 was also measured. The above experience and data have been used in the embankment of the Dongdong Power Plant in Fuzhou.