软岩嵌岩桩自平衡试桩荷载–沉降曲线解析转换算法

郭宸畅; 饶军应; 刘畅; 陈忆; 尹泉

doi:10.3724/j.gyjzG23080702

软岩嵌岩桩自平衡试桩荷载–沉降曲线解析转换算法

doi: 10.3724/j.gyjzG23080702

郭宸畅¹,
饶军应^2, ,,
刘畅¹,
陈忆¹,
尹泉³

1. 贵州大学土木工程学院, 贵阳 550025;
2. 贵州大学空间结构研究中心, 贵阳 550025;
3. 湖南城市学院土木工程学院, 湖南益阳 413000

基金项目:

国家自然科学基金项目（51968010，51608141）；湖南省自然科学基金项目（2022JJ50281）。

详细信息

作者简介:
郭宸畅，硕士研究生，主要从事岩土及隧道工程方面研究工作，mccguo@yeah.net。

通讯作者:
饶军应，博士，副教授，主要从事岩土及隧道工程方面教学与科研工作，jyrao@gzu.edu.cn。

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出版历程
- 收稿日期: 2023-08-07
- 网络出版日期: 2024-05-29

An Analytical Transformation Algorithm for Loading-Settlement Curves of Rock-Socketed Piles in Soft Rock by Self-Balanced Tests

1. School of Civil Engineering, Guizhou University, Guiyang 550025, China;
2. Spatial Structure Research Center, Guizhou University, Guiyang 550025, China;
3. School of Civil Engineering, Hunan City University, Yiyang 413000, China

摘要

摘要: 为更准确反映软岩地基中自平衡试桩结果，提出一种针对软岩嵌岩桩承载力的自平衡试桩结果解析转换算法。首先，通过分析桩–软岩接触面剪切机理，建立了考虑胶结、剪胀以及滑移三个剪切阶段的桩–软岩接触面荷载传递函数和模型。其次，考虑荷载箱上段桩重力的影响并结合桩–软岩接触面荷载传递函数，推导出自平衡试桩荷载–沉降曲线的理论解析解，通过将两根试桩的实测数据与理论解析解结果进行对比，计算得出理论解析解的精确度分别为87.3%和85.6%。最后，在现有简化转换法基础上提出解析转换法，通过与精确转换法结果进行比较，解析转换法结果较简化转换法结果精确度分别提高了15.3%和17.4%。解析转换法简单实用且精确度较高，可为软岩嵌岩桩自平衡试桩工程提供一定的参考。
- 软岩嵌岩桩 /
- 自平衡试桩 /
- 桩–软岩接触面 /
- 荷载传递法
Abstract: To more accurately reflect the test results of the bearing capacity of piles by self-balanced tests in soft rock foundation, an analytical transformation algorithm for the tested bearing capacity of rock-socketed piles by selfbalanced tests was proposed. Firstly, the shear mechanism of interfaces between piles and soft rock was analyzed, and a transfer function of loads and model for the interfaces between piles and soft rock were established considering the three shear stages of cementation, shear dilation and slip. Secondly, the analytical solution for loading-settlement curves of piles by the self-balanced tests was deduced considering the influence of the pile weight of the upper section on the loading box and combining the load transfer function of the interface between piles and rock. Comparing the measured data of two test piles with the calculating results by the analytical solution, the accuracy calculating results by the analytical solutions was 87.3% and 85.6% respectively. Eventually, based on the existing simplified transformation method, an analytical transformation method was proposed. Comparing the results with the precise transformation solutions, the accuracy of the calculating results by the analytical transformation solution was respectively improved by 15.3% and 17.4% compared with the calculating results by the simplified transformation method. The analytical transformation method was simple, practical, and more accurate, which could provide reference to self-balancing tests in engineering with rock-socketed piles in soft rock.
- rock-socketed pile in soft rook /
- self-balanced test /
- interface between piles and soft rock /
- load transfer method

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参考文献(18)

[1]	吕福庆,吴文,姬晓辉.嵌岩桩静载试验结果的研究与讨论[J].岩土力学, 1996, 17(1):84-96.
[2]	OSTERBERG J. New device for load testing driven piles and drilled shafts separates friction and end bearing[C]//Proceedings of International Conference on Piling and Deep Foundations. Rotterdam:A A Balkema, 1989:421-427.
[3]	龚维明,戴国亮,蒋永生,等.桩承载力自平衡测试理论与实践[J].建筑结构学报, 2002, 23(1):82-88.
[4]	鲍育明,刘亚文,李志成,等.自平衡法在桩基承载力检测中的应用[J].解放军理工大学学报(自然科学版), 2003, 4(3):49-52.
[5]	郑英杰,张克绪,张尔其,等.由O-cell试桩结果确定整桩的性能[J].岩土工程学报, 2008, 30(9):1416-1422.
[6]	陈龙珠,梁国钱,朱金颖,等.桩轴向荷载-沉降曲线的一种解析算法[J].岩土工程学报, 1994, 16(6):30-38.
[7]	熊巨华,蒋益平,杨敏.自平衡试桩结果的解析转换法[J].同济大学学报(自然科学版), 2007, 35(2):161-165.
[8]	奚笑舟,陈龙珠.自平衡法试验上段桩荷载-位移曲线的解析拟合算法[J].上海交通大学学报, 2011, 45(10):1498-1503.
[9]	欧孝夺,白露,吕政凡,等.黏土地基中自平衡试桩Q-s曲线解析转换方法及模型试验研究[J].中南大学学报(自然科学版), 2022, 53(2):631-642.
[10]	SEED H B, REESE L C. The action of soft clay along friction Piles[J]. Transactions of the American Society of Civil Engineers, 1957, 122(1):731-754.
[11]	JOHNSTON I W, LAM T. Shear behavior of regular triangular concrete/rock joints:analysis[J]. Journal of Geotechnical Engineering, 1989, 115(5):711-727.
[12]	赵明华,夏润炎,尹平保,等.考虑软岩剪胀效应的嵌岩桩荷载传递机理分析[J].岩土工程学报, 2014, 36(6):1005-1011.
[13]	SAIANG D, MALMGREN L, NORDLUND E. Laboratory tests on shotcrete-rock joints in direct shear, tension and compression[J]. Rock Mechanics&Rock Engineering, 2005, 38(4):275-297.
[14]	刘建刚,王建平.嵌岩桩的嵌固效应及载荷试验P-s曲线特征分析[J].工业建筑, 1995, 25(5):41-44 , 48.
[15]	朱珍德,邢福东,渠文平,等.岩石-混凝土两相介质胶结面抗剪强度分形描述[J].岩石力学与工程学报, 2006, 25(增刊1):2910-2917.
[16]	PATTON F D. Multiple modes of shear failure in rock[C]//Proceeding of the 1st Congress of International Rock Mechanics.1966:509-513
[17]	RANDOLPH M F, WROTH C P. Analysis of deformation ofvertically loaded piles[J]. Journal of the Geotechnical Engineering Division, 1978, 104(12):1465-1488.
[18]	中华人民共和国住房和城乡建设部.建筑基桩自平衡静载试验技术规程:JGJ/T 403-2017[S].北京:中国建筑工业出版社, 2009.