岩土力学2017，Vol.38Issue(6)：1666-1674,9.DOI:10.16285/j.rsm.2017.06.015
开挖条件下非均质地基中单桩竖向承载特性非线性分析
Nonlinear analysis for bearing characteristics of vertically loaded single pile in non-homogeneous soil under excavation
摘要
Abstract
In this study,a simplified nonlinear calculation method was developed to analyze the single pile in non-homogeneous soil under excavation,considering the unloading rebound of soil and changes of soil property caused by excavation.The calculated results show good agreement with testing results obtained by the present method,which indicates that the validity of this method is verified.Moreover,we studied the responses of the single pile after excavation under vertical load using the simplified method.It is found that the ultimate vertical bearing capacity and vertical stiffness of the pile loaded after excavation are overestimated by both the conventional loading test method and loading test with the sleeve method,which could lead to an unsafe design.In addition,excavation causes rebound of soils around the pile and then results in tension force in the pile.To avoid the pile be pulled apart,the reinforcing bars in the middle-lower part of the pile should be raised when the excavation depth is deep.The unloading rebound of soil around caused a great decrease in stiffness of the pile top.关键词
开挖/极限承载力/土体卸荷回弹/桩顶刚度/超固结Key words
excavation/ultimate bearing capacity/soil unloading rebound/pile top rigidity/over-consolidation ratio分类
建筑与水利引用本文复制引用
纠永志,祝彦知..开挖条件下非均质地基中单桩竖向承载特性非线性分析[J].岩土力学,2017,38(6):1666-1674,9.基金项目
国家自然科学基金项目(No.51608548) （No.51608548）
河南省科技攻关项目(No.082102360056) （No.082102360056）
郑州市科技攻关计划项目(No.10PTGG382-2).This work was supported by the National Natural Science Foundation of China (51608548),the Science and Technology Project of Henan Province (082102360056) and the Science and Technology Project of Zhengzhou City (10PTGG382-2). （No.10PTGG382-2）
