Effect of soil plugging during press-in caisson sinking in soft ground

doi:10.3785/j.issn.1008-973X.2020.07.017

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (7): 1380-1389 DOI: 10.3785/j.issn.1008-973X.2020.07.017

Effect of soil plugging during press-in caisson sinking in soft ground

Qiong YI1(

),Shao-ming LIAO1,*(

),Ji-wen ZHU2,Wei-zhong XU2

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2. Shanghai Urban Construction Municipal Engineering (Group) Limited Company, Shanghai 200065, China

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Abstract

An analytical calculation formula of soil plug’s height was deduced based on the generating mechanism of soil plug in order to analyze the control of press-in caisson’s sinking stability in soft ground. Then the coupled Eulerian-Lagrangian (CEL) method was used to simulate the sinking process of a press-in caisson. The influence of soil plugging effect on lateral friction force and blade feet resistance force was discussed based on the analysis of the developing process of soil plug and stress and strain field of soil. Results show that the analytical calculation formula can precisely predict the soil plug’s height in soft ground. The soil plugging effect gradually increases during the caisson’s press-in sinking procedure, but the pace of change slows down around the depth of 25 m. The plug length ratio (PLR) is about 0.56 at the end of sinking, and the incremental filling ratio (IFR) is about 0.41, which means that the soil plug is still incomplete occlusive. The increase in horizontal and vertical soil stress as well as the equivalent plastic strain caused by soil plugging effect mainly concentrated in the range of the effective soil plug’s height. Then the lateral friction force increases, but lateral friction force of inner wall grows more remarkable compared with outer wall. The blade feet resistance force increases owing to soil plugging effect, and the increase becomes significant especially in soft ground.

Key words： press-in caisson soft ground soil plugging effect effective soil plug’s height coupled Eulerian-Lagrangian (CEL)

Received: 09 June 2019 Published: 05 July 2020

CLC:

U 445

Corresponding Authors: Shao-ming LIAO E-mail: yiqiong@tongji.edu.cn;liaosm@126.com

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Cite this article:

Qiong YI,Shao-ming LIAO,Ji-wen ZHU,Wei-zhong XU. Effect of soil plugging during press-in caisson sinking in soft ground. Journal of ZheJiang University (Engineering Science), 2020, 54(7): 1380-1389.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.07.017 OR http://www.zjujournals.com/eng/Y2020/V54/I7/1380

软土地层中压入式沉井下沉的土塞效应及其影响

针对软土地层中压入式沉井的下沉稳定性控制问题，基于土塞形成机理推导出土塞高度的计算表达式，采用耦合欧拉-拉格朗日法（CEL）模拟沉井的动态压入过程，分析下沉中的土塞演化过程及土体应力、应变场，探讨土塞效应对沉井侧摩阻力和刃脚阻力的影响. 结果表明：在软土地层中，土塞高度的计算表达式能够较准确地得到下沉时的井内土塞高度；沉井压入下沉时土塞效应逐渐增大，在下沉深度约为25 m时变化趋势放缓，土塞率(PLR)约为0.56，土塞增量填充率(IFR)约为0.41，土塞为不完全闭塞；土塞效应引起的井内土体水平和竖向应力激增及土体等效塑性应变主要集中于有效土塞高度范围内；土塞效应会使沉井侧摩阻力尤其是内壁侧摩阻力显著增大；土塞效应会使沉井刃脚阻力增大，尤其在软弱地层中最明显.

关键词： 压入式沉井, 软土地层, 土塞效应, 有效土塞高度, 耦合欧拉-拉格朗日法（CEL）

Fig.1 Structure profile of press-in caisson

Fig.2 Plan of construction site

Tab.1 Physico-mechanical parameters of soil layers

Fig.3 Geological profile of construction site

Fig.4 Force analysis diagram of soil plug in press-in caisson

Fig.5 Sketch of CEL finite element model

Tab.2 Calculation parameters of soils in CEL method

Fig.6 Comparison of tip resistance between numerical model and field test

Fig.7 Variation of PLR and IFR along sinking depth

Fig.8 Typical distribution of soil velocity field during sinking procedure

Fig.9 Typical deformation trend of soil particles during sinking procedure

Fig.10 Typical horizontal stress contours

Fig.11 Typical vertical stress contours

Fig.12 Typical equivalent plastic strain contours

Fig.13 Variation of lateral friction force of inner wall along sinking depth

Fig.14 Variation of lateral friction force of outer wall along sinking depth

Fig.15 Variation of blade feet resistance force along sinking depth


[1]	徐鹏飞, 李耀良, 徐伟压入式沉井施工对环境影响的现场监测研究[J]. 岩土力学, 2014, 35 (4): 1084- 1094 XU Peng-fei, LI Yao-liang, XU Wei Field measurement and analysis of influence of jacked open caisson construction on environments[J]. Rock and Soil Mechanics, 2014, 35 (4): 1084- 1094

[2]	PAIKOWSKY S G, WHITMAN R V The effects of plugging on pile performance and design[J]. Canadian Geotechnical Journal, 1990, 27 (4): 429- 440 doi: 10.1139/t90-059

[3]	RANDOLPH M F, LEONG E C, HOULSBY G T One-dimensional analysis of soil plugs in pipe pile[J]. Geotechnique, 1991, 41 (4): 587- 598 doi: 10.1680/geot.1991.41.4.587

[4]	杜来斌 PHC管桩土塞效应浅析[J]. 工业建筑, 2005, (Suppl. 1): 590- 594 DU Lai-bin Brief analysis of plug effect of PHC pipe piles[J]. Industrial Construction, 2005, (Suppl. 1): 590- 594

[5]	赵明华, 肖容, 杨超炜, 等基于太沙基极限承载力理论的管桩土塞高度计算方法[J]. 湖南大学学报: 自然科学版, 2018, 45 (7): 85- 92 ZHAO Ming-hua, XIAO Rong, YANG Chao-wei, et al Study on calculation method of soil plug height of pipe pile based on Terzaghi ultimate bearing capacity[J]. Journal of Hunan University: Natural Sciences, 2018, 45 (7): 85- 92

[6]	詹永祥, 姚海林, 董启朋, 等砂土中开口管桩沉桩过程的颗粒流模拟研究[J]. 岩土力学, 2013, 34 (1): 283- 289 ZHAN Yong-xiang, YAO Hai-lin, DONG Qi-peng, et al Study of process of open-ended pipe pile driven into sand soil by particle flow simulation[J]. Rock and Soil Mechanics, 2013, 34 (1): 283- 289

[7]	肖勇杰, 吕艳平, 陈福全高频振动贯入过程中灌注桩护壁套管土塞效应机理[J]. 四川大学学报: 工程科学版, 2016, 48 (2): 74- 82 XIAO Yong-jie, LV Yan-ping, CHEN Fu-quan Mechanisms of soil plugging effect inside sleeve of cast-in-place piles driven by high frequency vibratory hammers[J]. Journal of Sichuan University: Engineering Science Edition, 2016, 48 (2): 74- 82

[8]	董译之, 吕艳平, 陈福全超大直径单桩基础高频振动贯入过程中的土塞效应[J]. 广西大学学报: 自然科学版, 2018, 43 (1): 286- 296 DONG Yi-zhi, LV Yan-ping, CHEN Fu-quan Soil plugging effect during driving of large diameter mono-pile by vibratory hammers[J]. Journal of Guangxi University: Natural Science Edition, 2018, 43 (1): 286- 296

[9]	王腾, 薛浩, 吴瑞黏土中静压管桩土塞机制研究[J]. 岩土力学, 2018, 39 (12): 4335- 4341 WANG Teng, XUE Hao, WU Rui Mechanism of soil plug for jacked pipe pile in clay[J]. Rock and Soil Mechanics, 2018, 39 (12): 4335- 4341

[10]	朱合华, 谢永健, 王怀忠上海软土地基超长打入PHC桩工程性状研究[J]. 岩土工程学报, 2004, (6): 745- 749 ZHU He-hua, XIE Yong-jian, WANG Huai-zhong Behavior of long PHC piles driven in Shanghai soft clay[J]. Chinese Journal of Geotechnical Engineering, 2004, (6): 745- 749 doi: 10.3321/j.issn:1000-4548.2004.06.004

[11]	周健, 陈小亮, 周凯敏, 等静压开口管桩沉桩过程模型试验及数值模拟[J]. 岩石力学与工程学报, 2010, 29 (Suppl. 2): 3839- 3846 ZHOU Jian, CHEN Xiao-liang, ZHOU Kai-min, et al Model test and numerical simulation of driving process of open-ended jacked pipe piles[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29 (Suppl. 2): 3839- 3846

[12]	张忠苗, 刘俊伟, 俞峰, 等静压预应力混凝土管桩土塞效应试验研究[J]. 岩土力学, 2011, 32 (8): 2274- 2280 ZHANG Zhong-miao, LIU Jun-wei, YU Feng, et al Research on plugging effect of jacked prestressed concrete pipe pile[J]. Rock and Soil Mechanics, 2011, 32 (8): 2274- 2280 doi: 10.3969/j.issn.1000-7598.2011.08.005

[13]	张忠苗, 谢志专, 刘俊伟, 等淤质与粉质互层土中管桩沉桩过程的土压力[J]. 浙江大学学报: 工学版, 2011, 45 (8): 1430- 1434 ZHANG Zhong-miao, XIE Zhi-zhuan, LIU Jun-wei, et al The earth pressure during pile driving in silty soil with mucky soil interbed[J]. Journal of Zhejiang University: Engineering Science, 2011, 45 (8): 1430- 1434

[14]	TAN Yong Full-scale testing of open-ended steel pipe piles in thick varied clayey silt deposits along the Delaware river in New Jersey[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139 (3): 518- 524 doi: 10.1061/(ASCE)GT.1943-5606.0000777

[15]	LIU Jun-wei, ZHANG Zhong-miao, YU Feng, et al Case history of installing instrumented jacked open-ended piles[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2012, 138 (7): 810- 820 doi: 10.1061/(ASCE)GT.1943-5606.0000638

[16]	PAIKOWSKY S G, WHITMAN R V, BALIGH M M A new look at the phenomenon of offshore pile plugging[J]. Marine Georesources and Geotechnology, 1989, 8 (3): 213- 230 doi: 10.1080/10641198909379869

[17]	费康, 张建伟. ABAQUS在岩土工程中的应用[M]. 北京: 中国水利水电出版社, 2010.

[18]	杨敏, 赵锡宏分层土中的单桩分析法[J]. 同济大学学报: 自然科学版, 1992, 20 (4): 421- 427 YANG Min, ZHAO Xi-hong An approach for a single pile in layered soil[J]. Journal of Tongji University: Natural Science, 1992, 20 (4): 421- 427

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[2]	HU Ya-yuan. Settlement of soft ground induced by cycle load considering secondary settlement[J]. Journal of ZheJiang University (Engineering Science), 2011, 45(1): 106-111.

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