沉降对应的支盘桩承载力控制方法研究

doi:10.13722/j.cnki.jrme.2024.0161

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Abstract The load-bearing capacity of squeezed branch piles(SBPs) can significantly increase under small incremental settlement deformations. By simultaneously controlling the pile top load and settlement to meet control requirements，the full potential of the SBP?s bearing capacity can be realized. This study introduced a load transfer equation for SBPs without critical displacement，incorporating the displacement parameter corresponding to 0.5 times the ultimate bearing capacity. A failure model for the soil around the bulb was established based on Meyerhof?s bearing capacity theory，determining the effective length of the shaft resistance in the straight section. A pile-soil failure model for SBPs with different bulb spacing was developed，identifying the optimal bulb spacing. An improved load transfer analysis method，considering both pile top design boundary conditions and pile tip control boundary conditions，enables synergistic control of both bearing capacity and settlement，achieving dual control targets. Field static load tests combined with numerical simulations verified the pile-soil failure model of SBPs and determined parameters for the load transfer equation. The theoretical framework optimized the pile length and layout of bulbs or branches under field conditions. Case verification showed that，while meeting design requirements，the optimized scheme reduces pile length by 14.3 meters，with a reduction of 3 branches and 1 bulb. The error between the theoretical ultimate bearing capacity and the numerical model calculation is 2.9%.

Key words： pile foundation squeezed branch pile improved load transfer method in situ testing ultimate bearing capacity settlement prediction

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	Articles by authors
	PAN Ling1
	XIONG Li1
	2
	HE Zhijun1
	LI Guowei2
	ZHOU Yang3

Cite this article:

PAN Ling1,XIONG Li1,2, et al. A controlling method of the settlement-induced bearing capacity of squeezed branch piles[J]. , 2024, 43(10): 2443-2454.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0161 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2443

[1]	蒲春平，何伟兵，贺佐跃. 潮汕地区桥梁挤扩支盘桩旁压试验分析[J]. 公路，2024，69(1)：151-156.(PU Chunpin，HE Weibin，HE Zuoyue. Pressuremeter test analysis of squeezed branch pile in Chaoshan area[J]. Highway，2024，69(1)：151-156.(in Chinese))
[2]	纪玉天. 桥梁挤扩支盘桩受力性能研究[硕士学位论文][D]. 石家庄：石家庄铁道大学，2022.(JI Yutian. Study on the mechanical properties of squeezed branch pile in bridge[M. S. Thesis][D]. Shijiazhuang：Shijiazhuang Railway University，2022.(in Chinese))
[3]	李勇，贵宁，李国维，等. 超声波法检测挤扩支盘桩轮廓形态模型试验[J]. 中国测试，2022，48(11)：62-67.(LI Yong，GUI Ning，LI Guowei，et al. Model test of ultrasonic method for detecting the contour of squeezed branch pile[J]. China Measurement and Test，2022，48(11)：62-67.(in Chinese))
[4]	中华人民共和国行业标准编写组. T/GDHS 002—2020 广东公路桥梁挤扩支盘桩技术规程[S]. 广东：广东省公路学会，2020.(The Professional Standards Compilation Group of People?s Republic of China. T/GDHS 002—2020 Technical specification for squeezed branch pile of highway bridges in Guangdong Province[S]. Guangdong：Guangdong Provincial Highway Society Press，2020.(in Chinese))
[5]	王安福，熊力，李国维，等. 支盘桩极限承载力现场破坏性试验及理论分析[J]. 公路交通科技，2023，40(10)：95-103.(WANG Anfu，XIONG Li，LI Guowei，et al. Field destructive test and theoretical analysis on ultimate bearing capacity of squeezed branch pile[J]. Journal of Highway and Transportation Research and Development，2023，40(10)：95-103.(in Chinese))
[6]	钱德玲. 具有高抗拔性能的支盘桩在工程中的应用研究[J]. 岩石力学与工程学报，2003，22(4)：678-682.(QIAN Deling. Engineering application study of squeezed branch pile with high tensile performance[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(4)：678-682.(in Chinese))
[7]	钱德玲. 挤扩支盘桩受力性状的研究[J]. 岩石力学与工程学报，2003，22(3)：494-499.(QIAN Deling. Study on bearing behavior of squeezed branch pile[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(3)：494-499.(in Chinese))
[8]	European Committee for Standardization(CEN). Design of concrete structures. Part 1-1：General rules and rules for buildings[S]. Brussels，Belgium：British Standard Institution，2004.
[9]	江杰，陈秋怡，欧孝夺，等. 考虑桩侧土体软化的能量桩热力响应分析[J]. 岩石力学与工程学报，2023，42(9)：2 295-2 305.(JIANG Jie，CHEN Qiuyi，OU Xiaoduo，et al. Analysis of thermal response of energy piles considering softening of pile-side soil[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(9)：2 295-2 305.(in Chinese))
[10]	董建华，郑亚林，吴晓磊. 减小负摩阻力履带桩的研发及力学特性分析[J]. 岩石力学与工程学报，2023，42(6)：1 520-1 533.(DONG Jianhua，ZHEN Yaling，WU Xiaolei. Study and development of caterpillar pile for reducing negative friction resistance and analysis of its mechanical properties[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(6)：1 520-1 533.(in Chinese))
[11]	董龙龙，吴文兵，梁荣柱，等. 基于指数模型的能源桩长期响应研究[J]. 岩石力学与工程学报，2021，40(3)：629-639.(DONG Lonlon，WU Wenbing，LIANG Rongzhu，et al. Long-term responses of energy piles based on exponential model[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(3)：629-639.(in Chinese))
[12]	张瑞坤，石名磊，倪富健，等. 黏性土中大直径超长钻孔灌注桩承载性状及单桩沉降分析[J]. 岩石力学与工程学报，2013，32(增2)：4 190-4 198.(ZHANG Ruikun，SHI Minlei，NI Fujiang，et al. Analysis of bearing properties of large-diameter and super-long bored pile in cohesive soil and single pile settlement[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.2)：4 190-4 198.(in Chinese))
[13]	RANDOLPH M F，WROTH C P. An analysis of the vertical deformation of pile groups[J]. Geotechnique，1979，29(4)：423-439.
[14]	LEE C Y. Discrete layer analysis of axially loaded piles and pile groups[J]. Computers and Geotechnics，1991，11(4)：295-313.
[15]	POULOS H G. Analysis of settlement of pile groups[J]. Geotechnique，1968，18(3)：449-471.
[16]	COMODROMOS E M，PAPADOPOULOU M C，RENTZEPERIS I K. Pile foundation analysis and design using experimental data and 3D numerical analysis[J]. Computers and Geotechnics，2009，36(5)：819-836.
[17]	TOSINI L，CIVIDINI A，GIODA G. A numerical interpretation of load tests on bored piles[J]. Computers and Geotechnics，2010，37(3)：425-430.
[18]	郭志广，魏丽敏，何群，等. 深厚软土地基预制管桩荷载传递试验与数值分析[J]. 中南大学学报：自然科学版，2014，45(10)：3 589-3 595. (GUO Zhiguang，WEI Liming，HE Qun，et al. Experimental and numerical analyses of load transfer characteristics of prestressed concrete pipe pile in deep soft soil[J]. Journal of Central South University：Science and Technology，2014，45(10)：3 589-3 595.(in Chinese))
[19]	BOHN C，ALEXANDRE L D S，FRANK R. Development of axial pile load transfer curves based on instrumented load tests[J]. Journal of Geotechnical and Geoenvironmental Engineering，2016，143(1)：04016081.
[20]	李连祥，李先军，成晓阳，等. 考虑圆孔扩张理论的支盘桩荷载传递法[J]. 中国公路学报，2018，31(8)：20-29.(LI Lianxiang，LI Xianjun，CHEN Xiaoyang，et al. Load transfer method for squeezed branch piles consider cavity expansion theory[J]. China Journal of Highway and Transport，2018，31(8)：20-29.(in Chinese))
[21]	《桩基工程手册》编委会. 桩基工程手册[M]. 北京：中国建筑工业出版社，1995：11-82.(Editorial Committee of the “Pile Foundation Engineering Manual”. Pile foundation engineering manual[M]. Beijing：China Architecture and Building Press，1995：11-82.(in Chinese))
[22]	FELLENIUS B H. Effective stress analysis and set-up for shaft capacity of piles in clay[C]// Proceedings of From Research to Practice in Geotechnical Engineering Congress. Washington：Geotechnical Special Publication，2008：384-406.
[23]	POULOS H G，DAVIS E H. Pile foundation analysis and design[M]. New York：John Wiley and Sons，1980：18-49.
[24]	XIONG L，LI G，ZHOU Y，et al. Experimental and analytical investigation of the bearing capacity of bulbs for squeezed branch piles[J]. International Journal of Geomechanics，2023，23(5)：04023045.
[25]	ZHANG M，XU P，CUI W，et al. Bearing behavior and failure mechanism of squeezed branch piles[J]. Journal of Rock Mechanics and Geotechnical Engineering，2018，10(5)：935-946.
[26]	HILL A V. The possible effects of the aggregation of the molecules of hemoglobin on its dissociation curves[J]. The Journal of Physiology，1910，40：4-7.
[27]	MEYERHOF G G. The ultimate bearing capacity of foundations[J]. Géotechnique，1951，2：301-332.
[28]	熊力. 支盘桩加固软土路基承载力理论及应用研究[博士学位论文][D]. 南京：河海大学，2023.(XIONG Li. Theoretical and application research on the bearing capacity of soft ground strengthened with squeezed branch piles[Ph. D. Thesis][D]. Nanjing：Hohai University，1993.(in Chinese))
[29]	范孟华. 基于最小抗力的支盘桩承载力和临界盘间距[J]. 岩土工程学报，2011，33(增2)：295-298.(FAN Menghua. Bearing capacity and critical plate spacing of piles with expanded branches and plates based on the minimum resistance[J]. Chinese Journal of Geotechnical Engineering，2011，33(Supp.2)：295-298.(in Chinese))