灰色系统理论在桩基竖向荷载试验中的预测应用研究

桩基极限承载力是基础设计及施工指导所需的重要参数,但是实际工程中将桩基加载至极限破坏状态极其困难。灰色系统理论作为一种新型预测方法,不仅可实现对桩基加载破坏时极限承载力的预测,且具有所需数据量少、预测精度高等特点。文中以桩基的竖向荷载静载试验中各级荷载作用下的荷载和沉降为研究对象,分析建立了基于灰色系统理论的预测模型,并用于预测桩基试验的荷载沉降规律。结果表明,灰色系统理论预测的沉降曲线与不同桩长的桩基础加载试验的实测沉降曲线间的误差较小,尽管灰色系统理论在不同桩长的预测规律误差方面有所差异,但灰色系统理论在桩基预测的整体预测效果上较为理想且具有较好的适用性。

PREDICTION APPLICATION FOR THE BEARING CAPACITY OF PILE LOADING-TEST BY THE GREY SYSTEM THEORY

Ultimate bearing capacity of pile foundation is an important parameter for foundation design and construction guidance. However, it is extremely difficult to load pile foundation to ultimate failure state in practical engineering. As a new prediction method, grey system theory can not only predict the ultimate bearing capacity of pile foundation under load failure, but also has the characteristics of less data required and higher prediction accuracy. The load and settlement of vertical load static load test of pile foundation is taken as the research object, the prediction model based on grey system theory is analyzed and established,and the results are used to predict the load settelment rule of pile test. The results show that the error between the settlement curve predicted by grey system theory and the measured settlement curve of pile foundation with different pile lengths is small. Although the grey system theory has some differences in the prediction errors of different pile lengths, the grey system theory is ideal and has good applicability in the overall prediction effect of pile foundation prediction.