湿陷性黄土地基桩的负摩擦力问题

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。

Problems on Negative Friction of Pile Foundation in Collapsible Loess Region

Lateral negative friction of piles in collapsible loess region of China and the relation between loess collapsed due its own weight and the negative friction of pile foundation are discussed in this paper. Preliminary research is conducted on whether the negative friction of pile foundation should be considered for loess collapsible due to additional load. Methods for approximate calculation of "neutral point" with respect to different ways of water absorption by the collapsible loess ground are given. From test data obtained on loess ground collapsible due to its own weight,it is considered that the occurrence of secondary negative friction peak value should be taken as a serious consideration in engineering work. Measures to overcome negative friction caused by the collapse of loess in pile foundation are recommended. In conclusion, five points are suggested for consideration in research of negative friction of pile foundation in collapsible loess region.