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本文通过杭州部分位于饱和粉土和砂土的预应力管桩静载荷试验对比,发现锤击法施工的桩承载力较低。认为施工中的锤击振动造成饱和粉土、砂土的液化,液化土通过开口的桩底涌入管内,桩端土和桩侧土密度不如静压桩和闭口桩。桩侧阻力较低、桩端阻力较低和桩端闭塞效应较低是这些桩承载力较低的主要原因。
In this paper, some static load tests of prestressed tubular piles located in saturated silt and sand in Hangzhou are carried out. It is found that the pile bearing capacity of the hammering method is low. It is considered that the hammering and vibrating in construction cause liquefaction of saturated silt and sand, and the liquefied soil is poured into the pipe through the opening of pile bottom. The density of pile-end soil and pile side soil is inferior to that of static pressure pile and closed pile. The low pile lateral resistance, low pile end resistance and low pile end closure are the main reasons for the low bearing capacity of these piles.