根键桩抗拔承载特性分析及变形预测

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (1): 119-126.

根键桩抗拔承载特性分析及变形预测

黄雪峰^*1,2, 张吉禄¹, 周俊鹏³, 韦林辉¹, 袁俊⁴, 王学明⁴

1.兰州理工大学土木工程学院, 甘肃兰州 730050;
2.重庆交通大学土木工程学院, 重庆 400074;
3.陆军勤务学院军事设施工程系, 重庆 401311;
4.中国电力工程顾问集团西北电力设计院有限公司, 陕西西安 710075

收稿日期:2019-11-19 出版日期:2023-02-28 发布日期:2023-03-21
通讯作者: 黄雪峰(1960-),男,甘肃兰州人,博士,教授,博导. Email:hxfen60@163.com
基金资助:
重庆市研究生创新基金(CYB18126)

Analysis of uplift bearing characteristics and deformation prediction of root pile

HUANG Xue-feng^1,2, ZHANG Ji-lu¹, ZHOU Jun-peng³, WEI Lin-hui¹ YUAN Jun⁴, WANG Xue-ming⁴

1. School of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
3. Department of Military Installations Engineering, Army Logistical University of PLA, Chongqing401311, China;
4. Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi'an 710075, China

Received:2019-11-19 Online:2023-02-28 Published:2023-03-21

摘要/Abstract

摘要： 根键桩现场足尺试验表明,根键的植入不仅使基础承载力大幅提高,根键阻力的稳定发挥还能有效抑制桩体位移.但由于试验条件所限,并未对根键桩多种根键组合模式下极限承载力进行量测,仅凭现有成果无法系统预测根键桩荷载位移发展规律.故采用ABAQUS软件对足尺试验进行模拟分析,通过对比不同根键密度、位置下的Q-S曲线,确定不同根键组合对承载力的影响规律以及根键承载特性的变化情况,进而基于荷载传递理论提出考虑根键密度以及间距影响的根键桩非线性变形计算方法,结果表明理论计算与实测及模拟结果具有较高吻合度,能够正确反映不同根键组合模式下基础的变形规律.

关键词: 根键桩, 抗拔承载特性, 数值模拟, 理论计算

Abstract: The full-scale field test of root pile shows that implantation of roots not only greatly improves the bearing capacity of foundation, but also effectively restrains the displacement of pile attributed to the stable exertion of root resistance. However, due to the limitation of test conditions, the ultimate bearing capacity of root piles has not been measured under various combination modes, and the existing results alone can not systematically predict the ultimate bearing capacity of root piles. Therefore, ABAQUS software is used to simulate and analyze the full-scale test mentioned. By comparing Q-S curves under different root densities and locations, the influence rule of different root combinations on the bearing capacity and the change of the bearing characteristics of the roots are determined. Based on the load transfer theory, a nonlinear deformation calculation method of the root pile considering the influence of the root bond density and the spacing is proposed. The results show that the theoretical prediction highly agrees with the simulation results, which correctly reflect the deformation law of the foundation under different root bond combination modes.

Key words: root pile, uplift bearing characteristics, numerical simulation, theoretical calculation

中图分类号:

TU473.1

黄雪峰, 张吉禄, 周俊鹏, 韦林辉, 袁俊, 王学明. 根键桩抗拔承载特性分析及变形预测[J]. 兰州理工大学学报, 2023, 49(1): 119-126.

HUANG Xue-feng, ZHANG Ji-lu, ZHOU Jun-peng, WEI Lin-hui YUAN Jun, WANG Xue-ming. Analysis of uplift bearing characteristics and deformation prediction of root pile[J]. Journal of Lanzhou University of Technology, 2023, 49(1): 119-126.

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