淤泥质土中打入桩负摩阻力影响分析

Impact Analysis of Negative Resistance of Driven Pile in the Muddy Soil

工程采用锤击法沉桩,根据试桩和工程桩的静载试验结果,场地工程地质条件、施工工艺和现场情况进行分析,认定位于淤泥中的打入桩桩侧存在负摩阻力。在设计中计算负摩阻力时,一般经验是将中心点以上的侧阻力作为零来计算基桩的承载力,或将下曳荷载作为外荷载来验算承载力。施工时要选择合理的施工工艺减少沉降,减少负摩阻力。

When the method of pile driving is used,it is found that negative resistance exists on the sides of piles when piles driven into the muddy soil,according to the experiment results of trail piling and static load of piling,and evaluation of geological conditions of project site,construction technique and on-site conditions. When negative resistance is calculated in the design,a normal practice is to calculate the bearing capacity of foundation pile,assuming that the lateral resistance above the central point is zero,or regarding the down pull bearing capacity is the outside one. when a project is built,correct techniques should be selected for reducing settlement and negative resistance.