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浙江大学学报(工学版)
土木工程     
大直径钻孔灌注桩的竖向承载性能
刘念武1,2, 龚晓南1,2, 俞峰3
1. 浙江大学 滨海和城市岩土工程研究中心, 浙江 杭州 310058;2. 浙江大学 软弱土与环境土工教育部重点实验室, 浙江 杭州 310058;3 浙江理工大学 建筑工程学院,浙江 杭州 310018
Vertical bearing capacity of large-diameter bored pile
LIU Nian-wu1,2, GONG Xiao-nan1,2, YU Feng3
1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
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摘要:

为了分析大直径钻孔灌注桩的承载性能,对2根直径分别为2.2 m的钻孔灌注桩开展自平衡试验,将试验结果与原位测试结果进行对比分析.通过对测试结果的分析发现,注浆后荷载箱的向上及向下荷载-位移曲线的变化更加缓慢,当桩端位移为20 mm(1%D,其中D为桩径)左右时,端阻达到极限状态,未注浆桩和注浆桩的极限端阻分别为2 834、3 561 kPa.桩身侧阻随着桩土相对位移的增大呈先增大后保持稳定的趋势,淤泥质粉土层、黏土夹粉砂层、圆砾混卵石层的侧阻在桩土相对位移为1.5~3.0 mm时达到稳定.注浆能够提高桩端以上一定深度的桩身侧阻,圆砾混卵石层中侧阻的提高幅度约为18%.荷载箱上下的侧阻随位移的变化模式不同,未注浆桩和注浆桩的转换系数的取值分别为0.92、0.91.桩的极限侧阻与不排水剪切强度呈线性关系,且桩的极限侧阻与不排水剪切强度具有较好的拟合度.圆砾混卵石层中极限侧阻与动力触探(63.5 kg)击数有一定的相关性.

Abstract:

The self-balancing test was conducted on two 2.2 m diameter drilled piles in order to analyze the bearing capacity of large diameter bored piles. The test results were compared with in-situ test results. Results show that the change of load-displacement of pile with post-grouting is slower than pile without post-grouting. The end resistance reached the limit state when pile tip displacements approached 20 mm (1% D, D is the pile diameter). The side resistance increased firstly and maintained a stable trend with the increase of pile-soil relative displacement. The critical displacement was 1.5-3.0 mm. Post-grouting can improve the side resistance over a certain depth from the pile tip, and the improvement in round gravel mixed pebble bed is 18 percent. Resistive loads up and down the side of the load cell is different and transformation coefficient is 0.92 and 0.91, respectively. Side resistance and undrained vane-shear strength has a linear relationship and has a better goodness of fit. The ultimate side resistance of round gravel mixed can be estimated by dynamic sounding (63.5 kg) hits.

出版日期: 2015-04-01
:  TU 473  
基金资助:

国家自然科学基金资助项目(51078377)

通讯作者: 龚晓南,男,教授,博导     E-mail: xngong@hzcnc.com
作者简介: 刘念武(1987—),男,博士生,从事桩和基坑的研究. E-mail: zjulnw@163.com
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引用本文:

刘念武, 龚晓南, 俞峰. 大直径钻孔灌注桩的竖向承载性能[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.04.022.

LIU Nian-wu, GONG Xiao-nan, YU Feng. Vertical bearing capacity of large-diameter bored pile. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.04.022.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2015.04.022        http://www.zjujournals.com/eng/CN/Y2015/V49/I4/763

[1] 龚维明,蒋永生,翟晋. 桩承载力自平衡测试法[J].岩土工程学报, 2000, 22(5): 523-536.
GONG Wei-ming, JIANG Yong-sheng, ZHAI Jin. Self-balanced loading test for pile beading capacity [J]. Chinese Journal of Geotechnical Engineering, 2000, 22(5): 523-536.
[2] OSTERBERG J. New device for load testing driven piles and drilled shaft separates friction and end bearing [J].Piling and Deep Foundations, 1989, 5(2): 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.
GONG Wei-ming, DAI Guo-liang, JIANG Yong-sheng, et.a1. Theory and practice of self-balanced loading test for pile bearing capacity [J].Journal of Building Structures,2002,23(1): 82-88.
[4] 戴国亮,龚维明,刘欣良.自平衡试桩法桩土荷载传递机理原位测试[J]. 岩土力学, 2003, 24(6): 1065-1069.
DAI Guo-liang, GONG Wei-ming, LIU Xin-liang. Experimental study of pile-soil load transfer behavior of self-balanced pile [J]. Rock and Soil Mechanic, 2003, 24(6): 1065-1069.
[5] 穆保岗,肖强,龚维明.自平衡法和锚桩法在高铁工程中的对比试验分析[J].解放军理工大学学报:自然科学版, 2012, 13(4): 414-418.
MU Bao-gang, XIAO Qiang, GONG Wei-ming.Research on in situ tests between self-balanced method and anchor pile method in high-speed railway [J]. Journal of PLA University of Science and Technology: Natural Science Edition, 2012, 13(4): 414-418.
[6] 刘杰,张可能.层状地基中单桩荷载传递规律[J].中南大学学报:自然科学版, 2003, 34(5): 571-575.
LIU Jie, ZHANG Ke-neng. Single pile load-transfer law in layered ground [J]. Journal of Central South University of Technology: Natural Science, 2003, 34(5): 571-575.
[7] 戴国亮, 龚维明,薛国亚,等.超长钻孔灌注桩桩端后压浆效果检测[J]. 岩土力学, 2006, 27(5): 849-852.
DAI Guo-liang, GONG Wei-ming, XUE Guo-ya, et.al. Effect examination for a base post-grouted overlength drilling pile [J]. Rock and Soil Mechanics, 2006, 27(5): 849-852.
[8] 于清泉,龚维明,梁书亭.卵石地区自平衡深层荷载试验的应用[J]..岩石力学与工程学报, 2010, 9(增2): 3847-3851.
YU Qing-quan, GONG Wei-ming, LIANG Shu-ting. Application of self-balanced deep level load test in pebble bed area [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 9(supple.2): 3847-3851.
[9] 黄思勇,熊刚,罗昊冲,等.津滨轻轨基础托换桩基承载力的自平衡试验[J].武汉大学学报:工学版, 2010, 43(4): 511-514.
HUANG Si-yong, XIONG Gang, LUO Hao-chong, et al. Self-balanced loading test for pile bearing capacity of pile under pinning on Jin-bin light track [J]. Engineering Journal of Wuhan University, 2010, 43(4):  511-514.
[10] 徐长节,李碧青,蔡袁强. 自平衡法试桩的承载特性试验研究[J]. 浙江大学学报:工学版, 2012, 46(7): 1262-1268.
XU Chang-jie, LI Bi-qing, CAI Yuan-qiang. Bearing capacity of self-balanced pile [J]. Journal of Zhejiang University: Engineering Science, 2012, 46(7): 1262-1268.
[11] 张忠苗, 张乾青. 后注浆抗压桩受力性状的试验研究[J]. 岩石力学与工程学报, 2009, 28(3): 472-486.
ZHANG Zhong-miao, ZHANG Qian-qing. Experimental study on mechanical properties of post-grouting compressive pile [J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(3): 472-486.
[12] LIU Nian-wu, ZHANG Zhong-miao, ZHANG Qian-qing, et al. Destructive field tests on mobilization of end resistance of cast-in-situ bored piles [J]. Journal of Central South University of Technology, 2003, 20(4): 1071-1078.
[13] 刘念武,俞峰,楼春晖. 注浆和复压对灌注桩端阻的影响分析[J].岩土工程学报,2013, 35(增2): 951-955.
LIU Nian-wu, YU Feng, LOU Chun-hui. Analysis of end resistance of post-grouting bored pile and pile conducted in two load cycle [J]. Chinese Journal of Geotechnical Engineering, 2013, 35(supple.2): 951-955.
[14] HIRAYAMA H. Load-settlement analysis for bored piles using hyperbolic transfer functions [J]. Journal of Geotechnical and Engineering Division, 1990, 30(1): 55-64.
[15] MULLINS G, WINTERS D, STEVEN D. Predicting end bearing capacity of post-grouted drilled shaft in cohesionless soils [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(4): 478-487.
[16] 张忠苗,邹健. 桩端后注浆上返高度及桩顶冒浆处理[J]. 土木建筑与环境, 2010, 32(5): 18.
ZHANG Zhong-miao, ZOU Jian. Climb height and overflow of grout in shaft base grouting [J]. Journal of Civil Architectural and Environmental Engineering, 2010, 32(5): 18.
[17] DB32/T291-1999, 桩承载力自平衡测试技术规程[s].南京:东南大学出版社,1999.
[18] REESE L C, O’NEILL M W. Drilled shafts: construction procedures and design methods [R]. Washington: U.S. Department of Transportation, Federal Highway Administration, 1988.
[19] 张有良. 最新工程地质手册[M]. 北京:中国知识出版社,2006: 185-197.

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