大直径人工挖孔桩承载性状分析

The Analysis of the Properties of Bearing of Large Diameter Manpower Excavation Pile

大直径人工挖孔桩具有单桩承载力高,质量容易保证,容易于施工等优点,在工程中已得到日益广泛的应用。本文通过某工程现场试桩资料,分析了大直径人工挖孔桩的沉降特性、荷载传递特性及承载性状。提出了桩的长径比超过某一值时,桩的承载力仍以侧摩阻力为主,而且随着长径比的增大,端阻力明显降低,桩长的增加并不能使承载力提高很多。因此,在应用大直径挖孔桩时,应根据工程实际情况,合理确定桩长,以充分发挥桩端阻力,从而获得良好的经济效益。

The large diameter manpower excavation pile is used widely in project for its high bearing capacity, reliable quality and easy construction. The subsidence characteristic and load transmission characteristic and bearing behaviors of the large diameter manpower excavation pile are analyzed through loading test data. It was found that the side friction of pile is dominant in the bearing capacity of large diameter. when the ratio of length and diameter exceeded a value and the more growth of the ratio the less tip resistance of pile was obtained.so we should be based on the condition of project about the bearing of large diameter to ascertain the length of pile in order to use the tip resistance of pile thoroughly and the economic profit will be gained in project.