桩的静载试验Q-S曲线延伸方法的探讨

The Discussion about the Method to Extend the Pile Dead Load Test Q-s Curve

现场静载试验目前仍是确定单桩竖向承载力的主要方法 ,由于条件限制 ,实际工程试桩往往很难达到规范规定的极限状态。本文推出一种曲线拟合方法 :对试桩的Q -s数据 ,采用几种不同的数学模型进行回归分析 ,从中找出相关程度最好的一种模式 ,以其推算所得作为该试桩的极限承载力推算值。作者收集了 689根试桩记录 ,以其中s已超过 40mm而未出现“骤沉”的 58根记录 ,按本文方法试算 ,结果说明该方法具有较好的实用性。

It is still the main way to determine the ultimate pile-bearing load capacity by the pile head load test currently although it could hardly reach to the ultimate status stated in the specification because of the condition limited.In this paper,the method of curve minmesis is give out to determine the ultimate pile load-bearing capacity by the model with the highest correlativity in several different mathemtical models to analysis the Q-S data of the pile test.This method is testified to be practicable by the calculation results of 58 piles' data which's has exceed 40mm but pile hasn't subsided suddenly in the total 689 piles'test data collected by the author.