后压浆桩增强效应作用机制及荷载沉降关系研究

戴国亮; 万志辉

doi:10.11779/CJGE201712012

后压浆桩增强效应作用机制及荷载沉降关系研究 English Version

戴国亮^1,2,
万志辉^1,2, ,

1. 东南大学混凝土及预应力混凝土教育部重点实验室,江苏南京 210096;
2. 东南大学土木工程学院,江苏南京 210096

基金项目: 国家重点基础发展计划（“973”计划）项目（2013CB036304）; 浙江省交通运输厅科研计划项目（2014H10）; 国家重点研发计划专项项目（2017FC0703008）; 江苏高校优势学科建设工程项目（1105007002）

详细信息

作者简介:
戴国亮(1975- ),男,博士,教授,博士生导师,主要从事岩土工程教学和科研工作。E-mail：daigl@seu.edu.cn。

通讯作者:
万志辉，E-mail：seuwanzhihui@163.com

中图分类号: TU473
计量
- 文章访问数: 380
- HTML全文浏览量: 2
- PDF下载量: 251
出版历程
- 收稿日期: 2016-09-27
- 发布日期: 2017-12-24

Enhanced mechanism and load-settlement relationship of post-grouting piles

DAI Guo-liang^1,2,
WAN Zhi-hui^1,2, ,

1. Key Laboratory for RC and PRC Structure of the Ministry of Education, Nanjing 210096, China;
2. School of Civil Engineering, Southeast University, Nanjing 210096, China

摘要

摘要: 基于台州湾大桥及接线工程开展的6个标段场地10根大直径超长钻孔灌注桩现场静载荷试验结果,分析后压浆桩的荷载传递特性,并在后压浆桩增强效应作用机制的基础上,采用双曲线函数的荷载传递模型,给出了后压浆桩荷载沉降关系的计算方法,并确定了不同土层桩侧和桩端增强系数,最后通过工程实例验证了该方法的合理性。结果表明,桩端压浆对桩端土体产生预压作用,使桩端阻力在竖向荷载作用下提前发挥,改善了桩端阻力与桩侧阻力发挥的异步性和不协调性;后压浆桩是在浆液对桩端土的加固、桩端压浆的预压作用、压浆形成桩底扩大头及浆液上返对桩侧加固四方面因素共同作用下显著增强桩端阻力和桩侧阻力,而忽略浆泡半径的影响或不考虑浆液上返段的作用都不能很好的预测压浆桩的极限承载力。
- 后压浆桩 /
- 增强效应 /
- 预压作用 /
- 荷载沉降关系 /
- 荷载传递法
Abstract: Based on the results of ten in-situ pile load tests of Taizhou Bay Bridge and its connecting projects in six different sites, the load transfer characteristics of grouted piles are analyzed. The hyperbolic load transfer function is used to calculate the load-settlement relationship of the grouted piles on the basis of the mechanism of strengthening effect. The improvement coefficients for side friction and tip resistance in different soil deposits are determined to account for the effect of grouting. Finally, case history is cited to demonstrate the validity of the method. The results indicate that the tip resistance of the grouted piles is mobilized before application of vertical load because of the preloading effect of soil beneath pile tip arising from tip grouting. Thus, the strain incompatibility between the tip resistance and the side friction of pile is improved. Moreover, the tip resistance and side friction of grouted piles will be significantly enhanced under the combined action of ground improvement of the soil beneath pile tip, preloading effect, enlarged tip area and the upward grout penetration along the pile side due to tip pressure grouting. However, ignoring the influence of grout bulb radius or grout climbing height may lead to an undesirable bearing capacity of the grouted piles.
- post-grouting pile /
- enhanced effect /
- preloading effect /
- load-settlement relationship /
- load transfer method

HTML全文

参考文献(28)

[1]	张忠苗. 桩基工程[M]. 北京: 中国建筑工业出版社, 2009. (ZHANG Zhong-miao. Pile foundation engineering[M]. Beijing: China Architecture & Building Press, 2009. (in Chinese))
[2]	张忠苗, 吴世明, 包风. 钻孔灌注桩桩底后注浆机制与应用研究[J]. 岩土工程学报, 1999, 21(6): 681-686. (ZHANG Zhong-miao, WU Shi-ming, BAO Feng. Study of mechanism and application on bored pile end grouting[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(6): 681-686. (in Chinese))
[3]	戴国亮, 龚维明, 程晔, 等. 自平衡测试技术及桩端后压浆工艺在大直径超长桩的应用[J]. 岩土工程学报, 2005, 27(6): 690-694. (DAI Guo-liang, GONG Wei-ming, CHENG Ye, et al. Application of self-bal an cedtesting and post grouting to large diameter and super-long piles[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(6): 690-694. (in Chinese))
[4]	SAFAQAH O, BITTNER R, ZHANG X G. Post-grouting of drilled shaft tips on the Sutong Bridge: a case study[C]// Proceedings of Geo-Denver 2007 Congress: Contemporary Issues in Deep Foundation. Denver, 2007.
[5]	DUAN X, KULHAWY F H. Tip post-grouting of slurry-drilled shafts in soil: Chinese experiences[C]// Contemporary Topics in Deep Foundations, ASCE, Orlando, 2009: 47-54.
[6]	ZHANG Z M, YU J, ZHANG G X, et al. Test study on the characteristics of mudcakes and in situ soils around bored piles[J]. Canadian Geotechnical Journal, 2009, 46(3): 241 -255.
[7]	DAI G, GONG W, ZHAO X, et al. Static testing of pile-base post-grouting piles of the Suramadu bridge[J]. Geotechnical Testing Journal, 2010, 34(1): 34-49.
[8]	JT/T 738—2009基桩静载试验自平衡法[S]. 2009. (JT/T 738—2009 Static loading test of foundation pile-self- balanced method[S]. 2009. (in Chinese))
[9]	BRUCE D A. Enhancing the performance of large diameter piles by grouting[J]. Ground Engineering, 1986, 19(4): 9-15.
[10]	THOMPSON P A. Base and shaft grouted piles[J]. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering, 1996, 119(3): 186-192.
[11]	MULLINS G, DAPP S, FREDERICK E, et al. Post grouting drilled shaft tips: Phase I[R]. Tampa: University of South Florida, 2001: 127-156.
[12]	RUIZ M E, PANDO M A. Load transfer mechanisms of tip post-grouted drilled shafts in sand[C]// Proceedings of International Foundation Congress and Equipment Expo: Contemporary Topics in Deep Foundation, Orlando, 2009: 23-30.
[13]	WAN Z, DAI G, GONG W, et al. Research of load settlement relationship for post grouted based on load transfer function method on Yueqing Bay Bridge[J]. Bridging the East and West, ASCE, 2016: 146-158.
[14]	张忠苗, 邹健, 刘俊伟, 等. 桩端后注浆浆液上返高度的理论研究[J]. 岩土力学, 2010, 31(8): 2535-2540. (ZHANG Zhong-miao, ZOU Jian, LIU Jun-wei, et al. Theoretical study of climbing height of grout in pile-bottom base grouting[J]. Rock and Soil Mechanics, 2010, 31(8): 2535-2540. (in Chinese))
[15]	黄生根, 龚维明. 超长大直径桩压浆后的承载性能研究[J]. 岩土工程学报, 2006, 28(1): 113-117. (HUANG Sheng-gen, GONG Wei-ming. Study on bearing behavior of super long-large diameter piles after grouting[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(1): 113-117. (in Chinese))
[16]	MULLINS G, WINTERS D, STEVEN D. Predicting end bearing capacity of post-grouted drilled shaft in cohesioniess soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(4): 478-487.
[17]	FANG K, ZHANG Z, YANG Q. Response evaluation of axially loaded grouted drilled shaft[J]. Marine Georesources & Geotechnology, 2014, 32(2): 123-134.
[18]	YOUN H, TONON F. Numerical analysis on post-grouted drilled shafts: a case study at the Brazo River Bridge, TX[J]. Computers and Geotechnics, 2010, 37(4): 456-465.
[19]	龚维明, 施明征, 孙逊. 桩底压浆灌注桩承载力计算[J]. 建筑结构, 1998, 28(11): 3-5. (GONG Wei-ming, SHI Ming-zheng, SUN Xun. Computation of bearing capacity of cast-in-place pile by grouting at the bottom[J]. Building Structure, 1998, 28(11): 3-5. (in Chinese))
[20]	吴江斌, 王卫东. 软土地区桩端后注浆灌注桩合理注浆量与承载力计算[J]. 建筑结构, 2007, 37(5): 114-129. (WU Jiang-bin, WANG Wei-dong. Estimation of the reasonable quantity of grouting and the bearing capacity of post base-grouted bored pile[J]. Building Structure, 2007, 37(5): 114-129. (in Chinese))
[21]	JGJ94—2008建筑桩基技术规范[S]. 2008. (JGJ94—2008 Technical code for building pile foundations[S]. 2008. (in Chinese))
[22]	JTJD63—2007公路桥涵地基与基础设计规范[S]. 2007. (JTJD63—2007 Code for design of ground base and foundation of highway bridges and culverts[S]. 2007. (in Chinese))
[23]	Florida Department of Transportation. Soils and foundations handbook[S]. 2012.
[24]	RANDOLPH M F, WROTH C P. Analysis of deformation of vertically loaded piles[J]. Journal of Geotechnical and Engineering Division, 1978, 104(12): 1465-1488.
[25]	HIRAYAMA H. Load-settlement analysis for bored piles using hyperbolic transfer functions[J]. Journal of Geotechnical and Engineering Division, 1990, 30(1): 55-64.
[26]	ESLAMI A, FELLENIUS B H. Pile capacity by direct CPT and CPTU methods applied to 102 case histories[J]. Canadian Geotechnical Journal, 1997, 34(6): 886-904.
[27]	MULLINS G, WINTERS D. Post grouting drilled shaft tips[R]. Florida: Florida Department of Transportation, 2004.
[28]	EL-KELESH A M, MOSSAAD M E, BASHA I M. Model of compaction grouting[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2001, 127(11): 955-964.

施引文献(2)

期刊类型引用(2)

1.	王卫星，潘大荣，陈立. 某地铁车站基坑外车道超载安全性分析. 江苏建筑. 2023(04): 112-114+125 . 百度学术
2.	谷浩源，韩流，张健，刘世宝，高志强，吴锋锋. 水-热耦合下露天矿冻结期靠帮开采边坡稳定性研究. 煤矿安全. 2023(12): 159-166 . 百度学术