[1]豆红强,纪歆雅,俞仰航,等.PHC管桩复合地基损伤破坏机理分析[J].自然灾害学报,2020,29(03):153-161.[doi:10.13577/j.jnd.2020.0317]
 DOU Hongqiang,JI Xinya,YU Yanghang,et al.Damage failure mechanism of composite ground with pre-stressed high-strength concrete pipe piles[J].,2020,29(03):153-161.[doi:10.13577/j.jnd.2020.0317]
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PHC管桩复合地基损伤破坏机理分析
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
29
期数:
2020年03期
页码:
153-161
栏目:
出版日期:
2020-06-28

文章信息/Info

Title:
Damage failure mechanism of composite ground with pre-stressed high-strength concrete pipe piles
作者:
豆红强123 纪歆雅1 俞仰航1 王浩13
1. 福州大学 环境与资源学院, 福建 福州 350116;
2. 自然资源部丘陵山地地质灾害防治重点实验室, 福建 福州 350002;
3. 福建省地质灾害重点实验室, 福建 福州 350002
Author(s):
DOU Hongqiang123 JI Xinya1 YU Yanghang1 WANG Hao13
1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China;
2. Key Laboratory of Geohazard Prevention of Hilly Mountain, Ministry of Land and Resources, Fuzhou 350002, China;
3. Fujian Key Laboratory of Geohazard Prevention, Fuzhou 350002, China
关键词:
PHC管桩损伤数值分析裂缝发展失稳模式
Keywords:
pre-stressed pipe piledamagenumerical analysisfracture developmentinstability mode
分类号:
TU443X9
DOI:
10.13577/j.jnd.2020.0317
摘要:
高强预应力管桩(PHC管桩)复合地基是刚性桩复合地基的一种常用形式,但目前对其桩体失稳破坏机理仍缺乏深入探讨。依托一具体工程实例,建立了超高填方荷载作用下PHC管桩复合地基的三维数值分析模型,藉此开展了考虑桩体刚度损伤的失稳破坏机理与破坏模式的研究。计算结果表明:混凝土损伤塑性模型可较好的描述PHC管桩的刚度退化和桩体损伤破坏后的力学软化行为;在超高填方荷载作用下,不同位置下的PHC管桩发生不同程度的拉伸损伤或压缩损伤,并伴随着拉裂缝的产生;PHC管桩复合地基中的桩体破坏模式可归结为弯曲破坏,但是不同位置桩体的弯曲应力产生机制有所不同,可能为压弯或拉弯。研究成果可为PHC管桩复合地基的优化设计提供一定的理论支撑。
Abstract:
The composite foundation with pre-stressed high-strength pipe pile (PHC pile) is a common form of rigid pile composite foundation. However, there is still lack of in-depth discussion on its failure mechanism. Based on a specific engineering case, a three dimensional numerical analysis model of the composite foundation with PHC pipe piles under super-high embankment loading was established, and the instability failure mechanism and failure mode considering the damage of pile stiffness were studied. The calculation results show that:the concrete damage plastic model can better describe the stiffness degradation of PHC pipe piles and the stress softening behavior after their failures. Under the action of high embankment loading, PHC pipe piles located different positions have different degrees of tensile damage or compression damage, and accompanied by the generation of tensile cracks. The failure mode of PHC piles can be attributed to bending failure, but the generation mechanisms of the bending stress for different piles are different, and may be stretch bending or press bending. The research results can provide certain theoretical support for the optimal design of composite foundation with PHC pipe pile.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2019-10-28;改回日期:2020-01-03。
基金项目:国土资源部丘陵山地地质灾害防治重点实验室(福建省地质灾害重点实验室)开放基金项目(FJKLGH2017K006);福建省自然科学基金项目(2017J05061)
作者简介:豆红强(1987-),男,讲师,博士,主要从事新型边坡支挡结构、数值分析方面的研究.E-mail:douhq@fzu.edu.cn
更新日期/Last Update: 1900-01-01