[1]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):103-108.
 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,(02):103-108.
点击复制

桩周土开挖条件下钢管桩屈曲稳定性试验研究()
分享到:

《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2016年02期
页码:
103-108
栏目:
研究论文
出版日期:
2016-04-15

文章信息/Info

Title:
Experimental study of the steel pipe pile bucking stability under excavation conditions
作者:
贾强12栾树12 李际平12张鑫12
(1.山东建筑大学 土木工程学院,山东 济南,250100;2. 山东省建筑结构鉴定加固与改造重点实验室,山东 济南,250100)
Author(s):
Jia Qiang12 LuanShu12 Li Jiping12Zhangxin12
(1. School of Civil Engineering, Shandong Jianzhu University, Jinan,250100;2. Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building structures, Jinan,250100)
关键词:
桩周土开挖屈曲稳定性稳定系数
Keywords:
soil excavation around the pile bucking stability stability coefficient
分类号:
TU473
文献标志码:
A
摘要:
既有建筑物增设地下空间时,需要运用桩基础支撑上部建筑物,才可开挖建筑物下面的土方。随着桩周土减少,桩的屈曲稳定性会相应减少。文章在模型箱内利用杠杆加载的方式对不同开挖深度条件下的钢管桩的屈曲承载力进行了研究和测试,分析了其相应的稳定系数。结果表明:当桩顶加载达到极限荷载时,桩身出现突然屈曲破坏,开挖比较小时,屈曲位置出现在桩土交界面附近,随着开挖比的增加,屈曲位置明显上移;随着桩周土开挖深度增加,桩的稳定系数随之减小,钢管桩下端处于嵌固状态时,其稳定系数比处于非嵌固状态时明显要大;钢管桩中部增设了水平拉接杆件后,其稳定性明显提高;桩周土的开挖比大于0.5时,回转半径较大的钢管桩稳定性系数较大;桩周土的开挖比小于0.5时,回转半径较大的钢管桩稳定性系数较小。
Abstract:
The underpinning pile can be used to support the existing building for construction of basement. The soil excavation around the pile can decrease the bearing capacity of piles. The piles bucking stability in different excavation depth was tested in model box by pry bar loading devise. Then, the stability coefficient was calculated. The test results indicate:(1)When the loads on the top of the pile reaching ultimate load, the body of the pile appears the buckling deformation. At the beginning of soil excavation, the buckling location of pile is near the interface of the pile and soil. The deeper soil excavation, the higher location of pile buckling.(2)The stability coefficient decreases with the soil excavation around the pile;(3) The stability coefficient with end build-in is higher than with end non embedded;(5) The stability coefficient of piles increases obviously after the horizontal components installed on the piles;(6) The stability coefficient of piles with high radius of gyration is bigger than with low radius of gyration when the ratio of excavation depth to length of pile over 0.5; on the contrary, the stability coefficient of piles with high radius of gyration is smaller than with low radius of gyration when the ratio of excavation depth to length of pile under 0.5. The engineering application proved rationality of the test results.

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,(02):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(02):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]
 LI Guoqi,JIA Qiang,*.Numerical analysis of pile foundation stability with lateral support under excavation condition of soil around pile[J].Journal of Shandong jianzhu university,2019,34(02):39.[doi:10.12077/sdjz.2019.06.007]
[4]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.
 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,(02):497.

更新日期/Last Update: 2016-04-01