[1]贾强1,2,李际平1,等.桩周土开挖条件下桩基础屈曲稳定性分析[J].山东建筑大学学报,2014,(06):497-503.
 Jia Qiang,Li Jiping,et al.Numerical analysis of plies bucking stability reducing caused by soil excavation around the piles[J].Journal of Shandong jianzhu university,2014,(06):497-503.
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桩周土开挖条件下桩基础屈曲稳定性分析
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《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2014年06期
页码:
497-503
栏目:
研究论文
出版日期:
2014-12-15

文章信息/Info

Title:
Numerical analysis of plies bucking stability reducing caused by soil excavation around the piles
作者:
贾强李际平张全立张鑫
1.山东建筑大学土木工程学院,山东 济南 250013;2.山东省建筑结构鉴定加固与改造重点实验室,山东 济南 250013;3.鲁商置业股份有限公司,山东 济南 250014
Author(s):
Jia Qiang 1 2 Li Jiping 1 2 Zhang Quanli 3 et al.
1. School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China; 2. Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures, Jinan 250013, China; 3. Lushang Property Co. , Ltd.Jinan 250014, China
关键词:
桩周土开挖屈曲稳定性数值分析
Keywords:
soil deep excavation piles bucking stability numerical analysis
分类号:
TU470
文献标志码:
A
摘要:
利用桩基础支撑既有建筑,下方开挖土方施工地下室是一种既有建筑地下增层的有效方法。随着桩周土的开挖,桩基础的稳定性会降低。文章利用ANSYS程序建立桩的二维有限元模型,桩周土用弹簧单元模拟,其线刚度用m法取值,通过特征值分析和非线性加载可分别获得桩基承载力的上限、桩基承载力的极限荷载和失稳时的变形曲线。结果表明:桩顶为自由端的桩基础,随着桩周土开挖深度的增加,其稳定性系数明显降低;相同开挖条件下,桩周土的m值和桩基截面边长越小,其桩基的稳定性系数越小;桩顶或桩身设置水平约束构件后,有效减小了计算长度,其稳定性系数比桩顶为自由端的桩基础提高了1.2~2.9倍,且开挖深度越深、桩周土m值越小,其效果提高的越明显。
Abstract:
 Pile underpinning technology is an effective method to develop underground space in retrofitting existing buildings. The soil excavation around the pile reduces the piles bucking stability.The 2D piles analysis model was established on ANSYS code, while the soil around the piles was simulated by spring element whose linear stiffness value gotten by mmethod assumption. First, the superior limit of piles bucking stability was obtained by using characteristic value analysis. Then,according to nonlinear loading method, the accurate value of piles bucking stability and the deformation pattern of piles were obtained. Stability coefficient of top free piles obviously reduces while the soil around the piles excavated. According to same soil excavated depth, the pile has the lower value of stability coefficient in lower m value soil or shorter length of a side of piles. After the horizontal components installed on the piles, the stability coefficient of piles increases 1. 2 -1. 9 times than the top free piles, especially in lower m value or deep excavated soil.

相似文献/References:

[1]贾强,栾树,张鑫.基于虚拟嵌固点法的桩基稳定性数值分析[J].山东建筑大学学报,2017,(01):12.[doi:10.12077/sdjz.2017.01.003]
 Jia Qiang,Luan Shu,Zhang Xin.Numerical analysis of the plies bucking stability based on illusion embedded solid point method[J].Journal of Shandong jianzhu university,2017,(06):12.[doi:10.12077/sdjz.2017.01.003]
[2]贾强,*,黄坤,等.桩周土开挖状态下桩基础荷载传递规律研究[J].山东建筑大学学报,2019,34(01):1.[doi:10.12077/sdjz.2019.01.001]
 JIA Qiang,*,HUANG Kun,et al.Study on loads transmitted laws of the existing building piles caused by soil around piles excavation[J].Journal of Shandong jianzhu university,2019,34(06):1.[doi:10.12077/sdjz.2019.01.001]
[3]李国奇,贾强,*.桩周土开挖状态带侧向支撑桩稳定性数值分析[J].山东建筑大学学报,2019,34(06):39.[doi:10.12077/sdjz.2019.06.007]
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[4]贾强,栾树,李际平,等.桩周土开挖条件下钢管桩屈曲稳定性试验研究[J].山东建筑大学学报,2016,(02):103.
 Jia Qiang,LuanShu,Li Jiping,et al.Experimental study of the steel pipe pile bucking stability under excavation conditions[J].Journal of Shandong jianzhu university,2016,(06):103.

更新日期/Last Update: 2015-02-01