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Vertical dynamic response of pile-soil plug based on surrounding fictitious soil pile model |
Si XIAO1(),Kui-hua WANG1,*(),Meng-bo WANG2 |
1. Research Center of Coastal and Urban Geotechnical Engineering, Key Laboratory of soft soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China 2. ZCONE High-tech Pile Industry Holdings Co. Ltd, Ningbo 315000, China |
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Abstract The surrounding fictitious soil pile model was proposed to simulate the interaction between pile and pile soil plug, and the vertical dynamic model of the pile and cement soil plug was built, considering the strong cohesiveness between the pile and inner cement soil. The analytical solution in the frequency domain and the semi-analysis in the time domain of dynamic response of pile top under simple harmonic excitation were derived by impedance function transfer method. The reliability of the solution was verified by comparing with that of 3D finite element model. A parameter study was conducted to investigate the influence of cement soil parameters on the dynamic characteristics at pile top. Laboratory tests on cement soil and field tests were performed to investigate the influence of inner cement soil on low-strain test curves of pile, and the key parameters in the model were fitted and inverted based on the measured curves. Results show that the reflection signal from the pile tip becomes weaker and the integrated velocity of the pile becomes smaller with the increase of the height of cement soil plug. However, the reflection signal from the pile tip becomes weaker and the integrated velocity of the pile becomes bigger slightly with the increase of the modulus of the cement soil plug. The size of fictitious soil pile obtained by inversion keeps stable but the damping coefficient shows big difference with that from empirical formula. The measured curves show a good agreement with calculated curves, which indicates that the proposed theoretical model can well simulate the dynamic interaction between piles and inner cement soil.
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Received: 27 June 2019
Published: 28 August 2020
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Corresponding Authors:
Kui-hua WANG
E-mail: xiaosi_508@zju.edu.cn;zdwkh0618@zju.edu.cn
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基于桩侧虚土桩模型的桩-桩芯土竖向动力响应
考虑桩芯水泥土与桩身的较强黏结性,提出桩侧虚土桩模型来模拟桩与桩芯土塞的相互作用,建立含水泥土土塞的竹节桩纵向动力模型. 通过阻抗函数递推方法得到简谐激振下桩顶动力响应频域解析解和时域半解析解,与三维有限元数值模型进行拟合对比,验证理论模型的合理性;通过参数分析研究水泥土相关参数对桩顶动力特性的影响;通过室内水泥土试验以及现场桩基试验,研究竹节桩桩芯水泥土对桩身低应变测试曲线的影响;根据实测曲线对模型中的关键参数进行拟合反演. 结果表明:竹节桩桩芯土塞高度增加会引起桩底反射信号减弱以及桩身综合波速减小,土塞模量增加会引起桩底反射信号减弱和轻微提前;拟合得到的虚土桩尺寸系数较为稳定;桩芯水泥土的阻尼系数与经验公式计算结果差异较大;在参数拟合过程中,理论模型计算得到的结果与实测曲线较符合,本研究理论模型可以较好地模拟桩与水泥土的动力相互作用.
关键词:
竹节桩,
水泥土土塞,
桩侧虚土桩,
低应变测试,
现场试验
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|
[1] |
RANDOLPH M F, LEONG E C, HOULSBY G T One-dimensional analysis of soil plugs in pipe pile[J]. Géotechnique, 1991, 41 (4): 587- 598
doi: 10.1680/geot.1991.41.4.587
|
|
|
[2] |
PAIK K H, LEE S R Behavior of soil plugs in open-endedmodel piles driven into sands[J]. Marine Georesources andGeotechnology, 1993, 11 (4): 353- 373
doi: 10.1080/10641199309379929
|
|
|
[3] |
刘润, 禚瑞花, 闫澍旺 大直径钢管桩土塞效应的判断和沉桩过程分析[J]. 海洋工程, 2005, 23 (2): 71- 76 LIU Run, ZHUO Rui-hua, YAN Shu-wang Plug effect on drivability of large-diameter steel piles[J]. The Ocean Engineering, 2005, 23 (2): 71- 76
doi: 10.3969/j.issn.1005-9865.2005.02.012
|
|
|
[4] |
ZHENG C J, LIU H L, DING X M, et al Vertical vibration of a large diameter pipe pile considering transverse inertia effect of pile[J]. Journal of Central South University, 2016, 23 (4): 891- 897
doi: 10.1007/s11771-016-3136-7
|
|
|
[5] |
郑长杰, 丁选明, 刘汉龙, 等 饱和均质土中PCC桩纵向振动响应简化解析方法[J]. 岩土工程学报, 2013, 35 (Suppl. 2): 1087- 1090 ZHENG Chang-jie, DING Xuan-ming, LIU Han-long, et al Simplified analytical solution for vertical vibration of PCC piles in saturated soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35 (Suppl. 2): 1087- 1090
|
|
|
[6] |
LI Z Y, WANG K H Vertical dynamic impedance of large-diameter pile considering its transverse inertia effect and construction disturbance effect[J]. Marine Georesources and Geotechnology, 2017, 35 (2): 256- 265
doi: 10.1080/1064119X.2016.1149259
|
|
|
[7] |
李振亚, 王奎华, 吴文兵 考虑挤土效应的大直径管桩纵向振动特性研究[J]. 岩石力学与工程学报, 2018, 37 (Suppl. 1): 3623- 3632 LI Zhen-ya, WANG Kui-hua, WU Wen-bing Vertical vibration of a large diameter pipe pile considering the compacting effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37 (Suppl. 1): 3623- 3632
|
|
|
[8] |
WU W B, EL NAGGAR M H, ABDLRAHEM M, et al A new interaction model for the vertical dynamic response of pipe piles considering soil plug effect[J]. Canadian Geotechnical Journal, 2017, 54 (7): 987- 1001
doi: 10.1139/cgj-2016-0309
|
|
|
[9] |
吴文兵, 邓国栋, 张家生, 等 考虑横向惯性效应时桩侧土-管桩-土塞纵向耦合振动特性研究[J]. 岩土力学, 2017, 38 (4): 993- 1002 WU Wen-bing, DENG Guo-dong, ZHANG Jia-sheng, et al Vertical dynamic response of soil surrounding pile-pipe pile-soil plug by considering lateral inertial effect[J]. Rock and Soil Mechanics, 2017, 38 (4): 993- 1002
|
|
|
[10] |
吴文兵, 蒋国盛, 王奎华, 等 土塞效应对管桩纵向动力特性的影响研究[J]. 岩土工程学报, 2014, 36 (6): 1129- 1141 WU Wen-bing, JIANG Guo-sheng, WANG Kui-hua, et al Influence of soil plug effect on the vertical dynamic response of large diameter pipe piles[J]. Chinese Journal of Geotechnical Engineering, 2014, 36 (6): 1129- 1141
doi: 10.11779/CJGE201406019
|
|
|
[11] |
ZHOU J J, GONG X N, WANG K H, et al Effect of cemented soil properties on the behavior of pre-bored grouting planted nodular pile under compression[J]. Journal of Zhejiang University-Science A: Applied Physics and Engineering, 2018, 19 (7): 534- 543
|
|
|
[12] |
ZHOU J J, GONG X N, WANG K N, et al Shaft capacity of the pre-bored grouted planted pile in dense sand[J]. ActaGeotechnica, 2018, 13 (5): 1227- 1239
|
|
|
[13] |
周佳锦, 王奎华, 龚晓南, 等 静钻根植竹节桩承载力及荷载传递机制研究[J]. 岩土力学, 2014, 35 (5): 1367- 1376 ZHOU Jia-jin, WANG Kui-hua, GONG Xiao-nan, et al Bearing capacity and load transfer mechanism of static drill rooted nodular piles[J]. Rock and Soil Mechanics, 2014, 35 (5): 1367- 1376
|
|
|
[14] |
赵会杰. 径向非均质黏弹性单相土中管桩纵向振动特性分析[D]. 大连: 大连海事大学, 2017. ZHAO Hui-jie. Study on vertical vibration characteristics of pipe piles in viscoelastic single-phase soil [D]. Dalian: Dalian Maritime University, 2017.
|
|
|
[15] |
吴文兵, 王奎华, 武登辉, 等 考虑横向惯性效应时楔形桩纵向振动阻抗研究[J]. 岩石力学与工程学报, 2011, 30 (Suppl. 2): 3618- 3625 WU Wen-bing, WANG Kui-hua, WU Deng-hui, et al Study of dynamic longitudinal impedance of tapered pile considering lateral inertial effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30 (Suppl. 2): 3618- 3625
|
|
|
[16] |
王奎华, 高柳, 肖偲, 等 考虑桩周土竖向作用大直径楔形桩纵向振动特性[J]. 岩土力学, 2016, (Suppl. 2): 223- 231 WANG Kui-hua, GAO Liu, XIAO Si, et al Dynamic characteristic of large diameter tapered pile considering vertical reaction of pile surrounding soil[J]. Rock and Soil Mechanics, 2016, (Suppl. 2): 223- 231
|
|
|
[17] |
NOVAK M Dynamic stiffness and damping of piles[J]. Canadian Geotechnical Journal, 1974, 11 (4): 574- 598
doi: 10.1139/t74-059
|
|
|
[18] |
LYSMER J, RICHART F E Dynamic response of footings to vertical loading[J]. Journal of Mechanics and Foundation Division, 1966, 92: 1091- 1117
|
|
|
[19] |
EL NAGGAR M H, NOVAK M Nonlinear axial interaction in pile dynamics[J]. Journal of Geotechniacal Engineering, 1994, 120 (4): 678- 696
doi: 10.1061/(ASCE)0733-9410(1994)120:4(678)
|
|
|
[20] |
刘东甲 纵向振动桩侧壁切应力频率域解及其应用[J]. 岩土工程学报, 2001, (5): 544- 546 LIU Dong-jia Frequency-domain solution of shear stress along pile-soil interface for longitudinal vibration of piles and its application[J]. Chinese Journal of Geotechnical Engineering, 2001, (5): 544- 546
doi: 10.3321/j.issn:1000-4548.2001.05.005
|
|
|
[21] |
胡志广. 基桩缺陷量化分析中桩土相互作用阻尼的研究[D]. 天津: 天津大学, 2006. HU Zhi-guang. Study on damping of pile-soil interaction in quantitative analysis of defect [D]. Tianjin: Tianjin University, 2006.
|
|
|
[22] |
王建华, 智胜英 低应变条件下桩土相互作用的阻尼系数[J]. 岩石力学与工程学报, 2007, 26 (9): 1800- 1808 WANG Jian-hua, ZHI Sheng-ying Damping coefficients of pile-soil interaction with low strain[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26 (9): 1800- 1808
doi: 10.3321/j.issn:1000-6915.2007.09.010
|
|
|
[23] |
周佳锦. 静钻根植竹节桩承载及沉降性能试验研究与有限元模拟[D]. 杭州: 浙江大学, 2016. ZHOU Jia-jin. Test and modeling on behavior of the pre-bored grouting planted nodular pile [D]. Hangzhou: Zhejiang University, 2016.
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