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软岩嵌岩桩荷载传递机理及其破坏特征

邢皓枫, 孟明辉, 罗勇, 叶观宝, 何文勇

邢皓枫, 孟明辉, 罗勇, 叶观宝, 何文勇. 软岩嵌岩桩荷载传递机理及其破坏特征[J]. 岩土工程学报, 2011, 33(sup2): 355-361.
引用本文: 邢皓枫, 孟明辉, 罗勇, 叶观宝, 何文勇. 软岩嵌岩桩荷载传递机理及其破坏特征[J]. 岩土工程学报, 2011, 33(sup2): 355-361.
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XING Hao-feng, MENG Ming-hui, LUO Yong, YE Guan-bao, HE Wen-yong. Load transfer mechanism and failure characteristics of piles embedded in soft rock[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 355-361.
Citation: XING Hao-feng, MENG Ming-hui, LUO Yong, YE Guan-bao, HE Wen-yong. Load transfer mechanism and failure characteristics of piles embedded in soft rock[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 355-361.
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软岩嵌岩桩荷载传递机理及其破坏特征  English Version

  • 1.同济大学地下建筑与工程系,上海 200092 ； 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092 ； 3. 贵州省交通规划勘察设计研究院股份有限公司,贵州 贵阳 550001

基金项目: 上海市重点学科建设项目(B308)；贵州省交通厅资助项目( 2010-021)
详细信息
    作者简介:

    邢皓枫 (1969 – ) ,男,河南人,博士,副教授,从事地基加固技术及基础工程教学与研究工作。

  • 中图分类号: TU473

Load transfer mechanism and failure characteristics of piles embedded in soft rock

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guizhou Transportation Planning Survey and Design Academe Co, Ltd, Guiyang 550001, China

摘要

    摘要
  • 摘要: 通过对大量嵌岩桩现场试桩资料的统计分析得出,试桩荷载下软岩嵌岩桩承载特性主要表现为端承摩擦桩,亦具有摩擦端承桩或端承桩的特性；嵌岩桩侧阻与端阻的发挥是异步的,即侧阻先于端阻发挥,建议将侧阻和端阻分别取不同的安全系数来设计单桩竖向承载力；嵌岩桩的破坏特征表现为突然破坏,破坏的原因有 2 种：①桩体发生破坏；②桩的嵌岩部分发生破坏,发生破坏的位置有桩岩界面、桩周围岩；现场试桩资料表明,即使是软岩嵌岩桩其破坏形式亦有可能是桩体材料破坏,因此,嵌岩桩设计时,尚应考虑桩身强度对其承载力的控制作用；最后对现行各行业规范进行了分析,指出一些仍需完善和探索的地方。
    Abstract: Based on a large number of field pile loading tests, the bearing characteristics of rock-socketed piles are analyzed. The statistics show that the rock-socketed piles mainly present as end-bearing friction ones and also have the properties of frictional end-bearing piles or end bearing piles under test load. The exertion of shaft resistance and end resistance is asynchronous, that is, the shaft resistance exerts prior to the end resistance, so, it is necessary to take different safety factors respectively to design the vertical bearing capacity. The rock-socketed piles have characteristics of sudden failure for two reasons: pile damage and socket section damage, including the interface of rock and piles and the surrounding rock. Field pile test data show that, even embedded in soft rock, the failure mode is usually presented as pile damage, so the control action of pile strength should be considered while conducting the design of rock-socketed piles. Finally, the calculation formulas in the existing norms are analyzed, and some unreasonable points are pointed out.
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  • 收稿日期:  2011-08-07
  • 发布日期:  2011-12-06

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