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本文对我国湿陷性黄土地区桩侧负摩擦力进行分析研究。叙述湿陷性黄土自重湿陷与桩基负摩擦力的关系,对于非自重湿陷性黄土是否考虑桩基负摩擦力问题作了初步探讨。根据湿陷性黄土地基的不同受水方式,提出计算“中性点”的近似方法。并根据自重湿陷性黄土地基上的试验资料,认为在工程中应重视桩基出现第二次负摩擦力峰值问题。为了防止桩基因黄土地基湿陷而产生负摩擦力,介绍了克服桩基负摩擦力的措施。最后提出五点建议,供研究分析湿陷性黄土地基桩基负摩擦力问题时参考。
This paper analyzes and studies the negative friction of piles in collapsible loess areas in China. The relationship between collapsible loess’self-heavy collapsibility and the negative friction force of pile foundation is described. For non-self-weight collapsible loess, whether the negative friction force of pile foundation is considered is discussed. According to the different water receiving ways of the collapsible loess foundation, an approximate method for calculating the “neutral point” is proposed. According to the test data on the self-consolidating collapsible loess foundation, it is believed that the second negative friction peak problem of the pile foundation should be emphasized in the project. In order to prevent the pile gene loess ground from collapsing and generate negative friction force, measures to overcome the negative friction force of the pile foundation were introduced. Finally, five suggestions are made for reference when studying the negative friction of pile foundation in collapsible loess foundation.