AM扩底桩在静载试验中的应变测试分析

覃卫民; 赵刚; 周伟江

AM扩底桩在静载试验中的应变测试分析 English Version

1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071 ； 2. 中交第二公路勘察设计研究院有限公司市政工程设计院,湖北武汉 430052 ； 3. 无锡市康达建筑安装工程有限公司,江苏无锡 214181

详细信息

作者简介:
覃卫民 (1973 – ) ,男,广西环江人,副研究员,从事岩土工程安全监测和技术开发等工作。

中图分类号: TU47
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出版历程
- 收稿日期: 2011-08-01
- 发布日期: 2011-12-06

Strain of AM bottom-expanded piles in static loading tests

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. CCCC Second Highway Consultans Co., Ltd., Wuhan 430052, China; 3. Wuxi City Kangda Build Install Engineering Co., Ltd, Wuxi 214181, China

摘要

摘要: 在武汉天兴洲长江大桥工程中引进先进的 AM 全液压扩底灌注桩施工技术,在国内铁路工程中属首次应用。根据线法测量原理,采用高精度滑动测微计对 AT 扩底桩在静载试验的桩身应变进行测试,其测试精度高,具有较高的工程应用价值。通过对 35 号墩 3 处试桩的应变测试结果可知,从施加第五级荷载起,桩端阻力才开始出现,最终端阻力占总荷载的 47.3 ％。 AM 扩底桩试桩属于摩擦端承桩,桩端阻力在试验后期的承载潜力巨大,这为工程推广应用提供设计依据。
- AM 扩底桩 /
- 滑动测微计 /
- 摩阻力 /
- 端阻力
Abstract: By introducing the full hydraulic construction, the technique of AM bottom-expanded piles is used for the bridge piles in Wuhan Tianxinzhou Yangtze River Bridge, which is applied for the first time in the railroad engineering in China. Based on the linear measuring principle, a high-precision sliding micrometer is applied to strain testing of AM piles under static loading condition. Because of its high measuring accuracy, the sliding micrometer has a great application value in tip resistance and side friction of pile tests. According to the strain results of three test piles, the tip resistance of AM piles begin to work since the 5th stage of loading applied, and the ratio of the tip resistance to the whole load is about 47.3 ％ . The AM piles belong to friction piles and they have obvious characteristics of end-bearing piles, and the AM piles have a huge potential tip resistance at later stage. The strain of AM pile tests provides a good reference for their design.
- AM bottom-expanded pile /
- sliding micrometer /
- friction force /
- tip resistance

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参考文献(6)

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