Nonlinear analysis for bearing characteristics of vertically loaded single pile in non-homogeneous soil under excavation

被引：0
|
作者：
Jiu Y.-Z. [1 ,2 ,3 ]
Zhu Y.-Z. [1 ]
机构：
[1] School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou, 450007, Henan
[2] Department of Geotechnical Engineering, Tongji University, Shanghai
[3] Key Laboratory of Geotechnical and Underground Engineering of Ministy of Education, Tongji University, Shanghai
来源：
| 1666年 / Academia Sinica卷 / 38期
基金：
中国国家自然科学基金;
关键词：
Excavation; Over-consolidation ratio; Pile top rigidity; Soil unloading rebound; Ultimate bearing capacity;
D O I：
10.16285/j.rsm.2017.06.015
中图分类号：
学科分类号：
摘要：
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. © 2017, Science Press. All right reserved.
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页码：1666 / 1674
页数：8
相关论文
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