[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):12-20.[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,(01):12-20.[doi:10.12077/sdjz.2017.01.003]
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基于虚拟嵌固点法的桩基稳定性数值分析()
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《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2017年01期
页码:
12-20
栏目:
研究论文
出版日期:
2017-02-15

文章信息/Info

Title:
Numerical analysis of the plies bucking stability based on illusion embedded solid point method
作者:
贾强12栾树12张鑫 12
(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)
Author(s):
Jia Qiang 12 Luan Shu12 Zhang Xin 12
(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)
关键词:
关键词:虚拟嵌固点法桩周土开挖桩基稳定性 临界入土深度数值分析
Keywords:
Key words:illusion embedded solid point method soil excavation around the pile piles bucking stability critical value of depth in solid numerical analysis
分类号:
TU430
DOI:
10.12077/sdjz.2017.01.003
文献标志码:
A
摘要:
摘要:运用桩基托换支撑既有建筑物地下增层时,随着桩周土的开挖,桩的稳定性会降低。因此,开展在桩周土开挖条件下的桩基稳定性的研究尤其重要。针对虚拟嵌固点法缺少半嵌固状态桩基稳定性计算公式的问题,文章利用ANSYS程序建立二维有限元模型,分析了在桩周土开挖条件下的桩的稳定性,建立了基于虚拟嵌固点法的半嵌固状态桩的稳定性计算公式,并对其进行了验证。结果表明:随着桩入土深度的增加,桩的稳定性系数趋近一定值,符合虚拟嵌固点法的基本假定;在桩周土开挖深度不变的条件下,桩径越大、桩周土水平反力系数越大、桩外露长度越小、桩顶约束越强则桩的稳定性系数越大;在桩身长度不变的条件下,随着桩周土开挖深度的增加,桩的稳定性系数降低;提出的基于虚拟嵌固点法的半嵌固状态下稳定性计算公式,其计算结果和数值分析的结果平均误差率仅有8.1%,与规范公式相比更符合桩的实际受力状态。
Abstract:
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. Therefore, it is especially important to study the stability of the plies bucking stability under the condition of pile soil excavation. For the lack of the formula of calculation length of compressed pile under the states that the part halfembedded pile depth in soil, ANSYS finite element analysis program was used to analyze the stability characteristics of pile under the excavation condition. A formula of calculation length of compressed pile is put forward under the states that the part of pile depth in soil is halfembedded, and the verification is carried out. The results show that, with the increase of pile depth in soil, the stability coefficient of pile reaches a certain value, which is so called critical value of depth in solid. This conclusion fits the assumption of illusion embedded solid point method. Under the same excavation depths condition, the pile has the higher value of stability coefficient in wider pile diameter, the higher level of soil reaction force coefficient, the shorter length of compressed pile or the stronger constraint on top of pile. Under the same pile lengthens condition, the bearing characteristics of pile decreases with the soil excavation. This paper puts forward the formula of calculation length of compressed pile under the states that the part of pile depth in soil is halfembedded. The formula of calculation length of compressed pile under the states that the part of pile depth in soil is halfembedded, which has only 8.1% difference with the numerical analysis results, fitting the actual load conditions.

参考文献/References:

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相似文献/References:

[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.
 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,(01):497.
[2]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.
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备注/Memo

备注/Memo:
收稿日期:2016-12-11 基金项目:国家自然科学基金资助项目(51278286);教育部科研创新团队支持计划项目(IRT13075);山东省教育厅科技计划项目(J10LE06) 作者简介:贾强(1970-),男,教授,博士,主要从事工程鉴定加固等方面的研究. E-mail: jiaqiang@sdjzu.edu.cn
更新日期/Last Update: 2017-03-07