There have been so many researches about the ultimate settlement of piles of pier, but few of them were about the settlement beyond construction.

目前，针对桥梁桩基沉降方面的研究较多，但是研究者和工程设计人员较关心的是桩基的总沉降，而对施工结束后的沉降——工后沉降的研究较少。

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Based on the model of elastic-plastic mechanics, this paper presents the conception of equivalent ultimate settlement of single pile, which is studied with results of static loading tests on piles.

本文根据弹塑性力学模型，提出了单桩等效极限位移的概念，并结合桩的静载试验成果，对其进行了分析探讨。

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By using the adding principle, the ultimate calculated formulas for calculating the ground surface settlement and horizontal displacement were obtained.

最后利用叠加原理，导出最终的地表沉降及水平位移计算公式。

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