短桩竖向承载力不合格问题的分析与处理

通过静载试验法和规程法计算分析静压管桩的短桩竖向极限承载力,结果表明:静压端承型短桩存在"短桩效应",倘若基桩竖向极限承载力设计取值不合理,在施工过程中沉桩终压桩力虽然达到设计要求,但在静载试桩时常常出现基桩竖向极限承载力不能满足设计要求,故与其他中长桩比较,在同一终压桩力条件下,端承型短桩的单桩竖向极限承载力标准值需考虑折减计算。同时提出短桩竖向承载力不合格问题的技术处理方法,由于静压短桩效应影响和短桩处理后条件的变化,应验算群桩竖向极限承载力。

Analysis and treatment of disqulification problem of short pile vertical bearing capacity

Based on the static load test and the calculation analysis,vertical bearing capacity of the static pressing concrete precasted short pipe-pile is obtained.The results show that it exists 'effection of short pile' of the end-bearing concrete precasted short pile.If pile vertical design bearing capacity was chosen inappropriately,during the construction it could accord with value design demand,however it couldn't satisfy the demand in the static load test.Thus its vertical bearing capacity should be reduced.I...