[1]段旭,董琪,门玉明,等.黄土挖填方场地中桩筏基础受力变形状态研究[J].西安建筑科技大学学报(自然科学版),2018,50(03):373-0380.[doi:10.15986/j.1006-7930.2018.03.010]
　DUAN Xu,DONG Qi,MEN Yuming,et al.Study on mechanism of deformation and destruction for piled raft foundation in loess areas with excavatedfilled[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2018,50(03):373-0380.[doi:10.15986/j.1006-7930.2018.03.010]
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黄土挖填方场地中桩筏基础受力变形状态研究

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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
50
期数:
2018年03期
页码:
373-0380
栏目:
出版日期:
2018-06-30

文章信息/Info

Title:
Study on mechanism of deformation and destruction for piled raft foundation in loess areas with excavatedfilled
文章编号:
1006-7930(2018)03-0373-08
作者:
段旭1; 董琪2; 门玉明3; 叶万军1; 李秉书4
(1.西安科技大学 建筑与土木工程学院，陕西 西安710054；2.陕西科技控股集团有限责任公司，陕西 西安710003；3.长安大学 地质工程与测绘学院，陕西 西安710054；4. 武警黄金部队第五支队，陕西 西安710100)
Author(s):
DUAN Xu1;  DONG Qi2;  MEN Yuming3;  YE Wanjun1;  LI Bingshu4
(1.School of Architectural and Civil Engineering,University of Science and Technology, Xi′an 710054, China; 2.Shaanxi Science & Technology Holding Group Co.,Ltd., Xi′an 710003, China; 3.College of Geological Engineering and Geomatics, Chang′an University, Xi′an 710054, China; 4.No.5 Gold Geological Part of PAP, Xi′an 710100, China)
关键词:
黄土挖填方场地; 桩筏基础; 模型试验; 不均匀沉降
Keywords:
Loess areas with excavatedfilled;  piledraft foundation;  model test;  uneven settlement
分类号:
TU473
DOI:
10.15986/j.1006-7930.2018.03.010
文献标志码:
A
摘要:
利用自制模型箱，以延安新区黄土挖填方场地中的桩筏基础为原型，开展了相似比为1∶5的模型试验.通过上部加载模拟上部结构荷载，对桩体纵筋、筏板表面的应变数据以及桩间土体的土压力数据进行采集分析.试验结果表明，随着上部荷载的增大，地基的不均匀沉降导致了基础产生向填方区的偏转，桩体发生明显的弯曲变形，不同部位桩体的应力集中位置以及桩土相互作用状态有明显区别.在模型试验的基础上探讨了挖填结合地基上桩土筏共同作用的计算式.基础设计时应避免桩体全段位于填方地基中，基桩底部应深入稳定原始土体，并通过对填方地基的预处理提高桩周土体的摩擦力，同时应考虑各桩轴向应变数值以及峰值位置的差异，有针对性地考虑桩体的承载能力.
Abstract:
In this paper, a self-made model box was used to prototype the pile-raft foundation in the loess excavation and filling site in Yan′an New Area, and a model test with a similar ratio of 1:5 was carried out. The loading of the upper structure was simulated by the artificial loading, and the strain data of the longitudinal reinforcement of the piles, the surface of the raft and the soil pressure data of the soil between the piles were collected The results show that with the increase of the upper load, the uneven settlement of the foundation leads to the deflection of the foundation to the fill area, the pile body undergoes significant bending deformation. There are obvious differences in stress concentration position and pilesoil interaction status of piles at different locations. Based on the model test, the calculation formulas for pile-soil-turbulence interaction on excavation and filling foundations are discussed. The piles should be avoided completely in the fill foundation and the bottom of the pile should be deepened to stabilize the original soil, and the friction of the soil around the pile should be improved through the pretreatment of the fill foundation. The axial strain of each pile should also be considered. The difference between the numerical value and the peak position, with a specific consideration of the bearing capacity of the pile.

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备注/Memo

备注/Memo:
收稿日期:2017-05-02修改稿日期:2018-05-29
基金项目:国家自然科学基金面上项目（41672305）;陕西省重点科技创新团队计划项目(2016KCT-13)；陕西省重点项目（2017ZDXM-SF-078）
第一作者:段旭(1991-)，男，博士生，主要从事土与结构物相互作用方向的研究．E-mail：duanxutim@163.com
更新日期/Last Update: 2018-09-11