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| Research on the Bearing Capacity of Micro Steel Pipe Pile in Loess Area with Large Thickness |
| ZHANG Xiaobing1, SHI Lei2 |
1. Shandong Jianzhu University, Jinan, Shandong 250101, China;
2. Northwest Research Institute Co. Ltd of C.R.E.C, Lanzhou, Gansu 730099, China |
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Abstract Research purposes: Micro pile has been widely used in foundation reinforcement for its advantages of small diameter, high bearing capacity and simple technology. There are few researches on the bearing capacity of micro steel piles in loess area. Relying on a practical reinforcement and deviation correction project, the vertical bearing capacity test of single pile of micro steel pipe pile on site was carried out, by means of theoretical analysis and numerical simulation, some conclusions were confirmed, in order to study the failure mode and bearing performance of micro steel pipe pile in loess area with large thickness.
Research conclusions:(1) The bearing capacity of micro steel pipe pile determined by body material is the biggest, the bearing capacity determined by side resistance and end resistance is the least, and the bearing capacity determined by the stability is in the middle. (2) In normal working conditions, the actual bearing capacity of micro steel pipe pile is much higher than the theoretical calculation value, which is about 1.3 times more than the theoretical calculation value. (3) The micro steel pipe pile has good bearing performance and still works well when the slenderness ratio reaches 400. (4) In practice, the design of super-large slenderness ratio micro-piles is not economical and easy to buckling instability failure. (5) The research in this paper can provide reference for the research on the bearing performance of micro steel pipe piles in loess area.
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Received: 30 August 2021
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| [1] |
贾强,郑爱萍,张鑫.高承台钢管桩受压稳定性的试验研究和数值分析[J].岩土力学,2011(6):1736-1740. Jia Qiang,Zheng Aiping,Zhang Xin. Test Study and Numerical Analysis of Stability of High-level Cap Steel Tubular Pile under Compression Loads[J]. Rock and Soil Mechanics, 2011(6):1736-1740.
|
| [2] |
李湛,滕延京,李钦锐,等.既有建筑加固工程的微型桩技术[J].土木工程学报,2015(S2):197-201.Li Zhan,Teng Yanjing,Li Qinrui,etc. Micro-pile Techniques for Improvement Project of Existing Buildings[J]. China Civil Engineering Journal,2015(S2):197-201.
|
| [3] |
王德华.微型钢管桩托换在浅层掏土纠偏中的应用研究[D]. 重庆:重庆大学,2007.Wang Dehua. Study on the Application of Micro Steel Pipe Pile Underpinning in Shallow Cut Soil Rectification[D].Chongqing:Chongqing University,2007.
|
| [4] |
朱彦鹏,董芸秀,包泽学,等. 超大厚度Q2黄土场地单桩承载力试验研究[J]. 岩石力学与工程学报,2014(S2):4375-4383.Zhu Yanpeng, Dong Yunxiu, Bao Zexue, etc. Experimental Study of Bearing Capacity of Single Pile in Large Thickness Q2 Loess Ground[J].Chinese Journal of Rock Mechanics and Engineering,2014(S2):4375-4383.
|
| [5] |
朱彦鹏,杨校辉,马天忠,等. 黄土塬地区大直径长桩承载性状与优化设计研究[J]. 岩石力学与工程学报,2017(4):1012-1023.Zhu Yanpeng,Yang Xiaohui,Ma Tianzhong,etc. Bearing Behavior and Optimization Design of Large-diameter Long Pile Foundation in Loess Subsoil[J]. Chinese Journal of Rock Mechanics and Engineering,2017(4):1012-1023.
|
| [6] |
冯世进,柯瀚,陈云敏, 等. 黄土地基中超长钻孔灌注桩承载性状试验研究[J]. 岩土工程学报,2004(1):110-114.Feng Shijin,Ke Han,Chen Yunmin,etc. Experimental Study on Bearing Behavior of Super-Long Bored Pile in Loess Foundation[J]. Chinese Jounal of Geotechnical Engineering,2004(1):110-114.
|
| [7] |
朱彦鹏,石磊,杨校辉.黄土地区微型钢管水泥桩单桩承载特性的试验研究[J].科学技术与工程,2018(12):267-274.Zhu Yanpeng,Shi Lei,Yang Xiaohui. Experimental Study on Bearing Capacity of Single Pile with Micro Steel Pipe Cement Pile in Loess Area[J]. Science Technology and Engineering,2018(12):267-274.
|
| [8] |
CECS 28—2012,钢管混凝土结构设计与施工规范[S].CECS 28—2012,Code for Design and Construction of Reinforced Concrete[S].
|
| [9] |
JGJ 94—2008,建筑桩基技术规范[S].JGJ 94—2008,Technical Code for Building Pile Foundations[S].
|
| [10] |
JGJ 106—2014,建筑基桩检测技术规范[S].JGJ 106—2014,Technical Code for Testing of Building Foundation Piles[S].
|
|
|
|
2023, Vol. 40 
