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PHC桩即为预应力高强度管桩,属预制桩,主要用来加固上部地层偏软,下部桩基持力层起伏不大,沉桩条件较好的地基。由于为部分挤密性质,所以对场地的液化土层没有明显改善,但在我省豫东某大型电厂的场地,进行PHC桩原体试验时,不但提高了地基土的强度,而且基本消除了场地地基土的液化性。本文根据场地特征结合原体试验结果,对PHC桩消除液化进行分析探讨。
PHC pile is prestressed high-strength pipe piles, which are prefabricated piles. They are mainly used to reinforce the soft foundation in the upper strata, which has little fluctuation in the bearing capacity of the lower pile foundation and good pile driving conditions. Due to the partial compaction property, there is no obvious improvement on the liquefied soil layer of the site. However, in the site of a large-scale power plant in the eastern part of Henan province, when the PHC pile body test is conducted, the strength of the foundation soil is not only increased but also basically eliminated Liquefaction of the foundation soil. Based on the site characteristics combined with the original test results, this paper analyzed and discussed the liquefaction of PHC piles.