湿陷性黄土场地PHC桩浸水试验研究

刘飞; 郑建国

湿陷性黄土场地PHC桩浸水试验研究 English Version

刘飞¹,
郑建国²

1. 西安建筑科技大学土木工程学院,陕西西安 710055 ； 2. 机械工业勘察设计研究院,陕西西安 710043

基金项目: 国家自然科学基金资助项目( 40972182)

详细信息

作者简介:
刘飞 (1982 – ) ,男,陕西蓝田人,博士研究生,从事岩土工程测试研究。

中图分类号: TU473.1
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出版历程
- 收稿日期: 2011-08-02
- 发布日期: 2011-12-06

Immersion tests on PHC piles in collapsible loess

LIU Fei¹,
ZHENG Jian-guo²

1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. China Jikan Geotechnical Institute, Xi’an 710043, China

摘要

摘要: 在湿陷性黄土场地对 2 根 PHC 管桩分天然、预湿和后湿 3 种工况进行的静载试验中,监测了 PHC 管桩浸水期桩顶沉降,测试了桩身内力,研究了 PHC 管桩承载力性状,探讨了桩身轴力、桩侧阻力变化规律。试验结果表明：本次浸水试验桩侧未见负摩阻力,浸水期附加沉降也不是黄土自重湿陷引起桩侧负摩阻力所致；桩身轴力在上部桩体距地面 6 m 段传递较慢,呈近垂线性,下部则呈非线性；不同工况下 PHC 管桩的桩侧阻力随深度分布曲线上具有不同“反弯点”,且在“反弯点”以上和以下桩侧阻力随深度的分布曲线形态不同,极限荷载下多段局部形成包络带。
- PHC 桩 /
- 湿陷性黄土 /
- 浸水试验 /
- 承载力性状
Abstract: The static load tests are adopted to investigate 2 PHC tubular piles in collapsible loess site under natural, pre-soaked and post-soaked soil conditions. Based on the additional settlement of piles during water immersion and stress tests in the process of static load tests, the bearing capacity behavior, axial force and lateral friction are analyzed. The test results show that there is no occurrence of negative skin friction under water immersion condition, and the additional settlement of the piles does not result from negative skin friction triggered by the self-weight collapse settlement. The transfer of axial force is slow from ground to the depth of 6 m, which behaves vertical line, and is nonlinear at the lower part of the piles. The curves of lateral friction varying with depth have different anti bending points. The difference between the upper part and lower part of the piles at anti bending points is clear. Local envelope zone appears under the ultimate load.
- PHC pile /
- collapsible loess /
- immersion test /
- bearing capacity behavior

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参考文献(7)

[1]	李大展 , 腾延京 , 何颐华 , 等 . 湿陷性黄土中大直径扩底桩垂直承载性状的试验研究 [J]. 岩土工程学报 , 1994, 16 (2): 11 – 21. (LI Da-zhan, TENG Yan-jing, HE Yi-hua, et al. Vertical bearing behaviour of large diameter belled pile in collapsible loess[J]. Chinese Journal of Geotechnical Engineering, 1994, 16 (2): 11 – 21. (in Chinese))
[2]	张炜 , 隋国秀 . 黄土中钻孔灌注桩荷载传递性状的试验研究 [C]// 全国岩土工程青年专家学术会议论文集 , 宁波 . 1998: 173 – 181. (ZHANG Wei, SUI Guo-xiu. On bearing behavior of hole bored pile in loess[C]//National Workshop of Young Experts Symposium on Geotechnical Engineering, Ningbo. 1998: 173 – 181. (in Chinese))
[3]	马侃彦 , 张继文 , 王东红 . 自重湿陷性黄土场地桩的负摩阻力 [J]. 岩土工程技术 , 2009, 23 (4): 163 – 166. (MA Kan-yan, ZHANG Ji-wen, WANG Dong-hong. Negative skin friction of pile in self-weight collapse loess site[J]. Geotechnical Engineering Technique, 2009, 23 (4): 163 – 166. (in Chinese))
[4]	刘争宏 , 郑建国 , 于永堂 . 湿陷性黄土场地 PHC 桩竖向承载性状试验研究 [J]. 岩土工程学报 , 2010, 32 ( 增刊 2): 111 – 114. (LIU Zheng-hong, ZHENG Jian-guo, YU Yong-tang. Vertical bearing behavior of PHC piles in collapsible loess[J]. Chinese Journal of Geotechnical Engineering, 2010, 32 (S2): 111 – 114. (in Chinese))
[5]	GB50025 — 2004 湿陷性黄土地区建筑规范 [S]. 北京 : 中国建筑工业出版社 , 2004. (GB50025 — 2004 Code for building construction in collapsible loess regions[S]. Beijing: China Architecture and Building Press, 2004 . (in Chinese))
[6]	钱鸿缙 , 王继唐 , 罗宇生 , 等 . 湿陷性黄土地基 [M]. 北京 : 中国建筑工业出版社 , 1985. (QIA N Hong-jin, WANG Ji-tang, LUO Yu-sheng, et al. Collapsed loess foundation[M]. Beijing: China Architecture and Building Press , 1985. (in Chinese) )
[7]	李大展 , 何颐华 , 隋国秀 . Q₂ 黄土大面积浸水试验研究 [J]. 岩土工程学报 , 1993, 15 (2): 1 – 11. (LI Da-zhan, He Yi-hua, SUI Guo-xiu. A large area field immersion test research on loess Q₂[J]. Chinese Journal of Geotechnical Engineering, 1993, 15 (2): 1 – 11. (in Chinese))

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湿陷性黄土场地PHC桩浸水试验研究 English Version

作者简介: 刘 飞 (1982 – ) ,男,陕西蓝田人,博士研究生,从事岩土工程测试研究。

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Immersion tests on PHC piles in collapsible loess

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作者简介:
刘飞 (1982 – ) ,男,陕西蓝田人,博士研究生,从事岩土工程测试研究。