Full Text:   <851>

Summary:  <334>

CLC number: 

On-line Access: 2022-08-22

Received: 2021-11-16

Revision Accepted: 2022-05-10

Crosschecked: 2022-08-30

Cited: 0

Clicked: 900

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Xiao-wu TANG

https://orcid.org/0000-0002-0916-8761

-   Go to

Article info.
Open peer comments

Journal of Zhejiang University SCIENCE A 2022 Vol.23 No.8 P.639-651

http://doi.org/10.1631/jzus.A2100585


Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation


Author(s):  Xiao-wu TANG, Wei-kang LIN, Yuan ZOU, Jia-xin LIANG, Wen-fang ZHAO

Affiliation(s):  Research Center of Coastal and Urban Geotechnical Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   tangxiaowu@zju.edu.cn

Key Words:  Drainage pipe pile, Soft soil, Consolidation, Bearing capacity, Foundation treatment


Xiao-wu TANG, Wei-kang LIN, Yuan ZOU, Jia-xin LIANG, Wen-fang ZHAO. Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation[J]. Journal of Zhejiang University Science A, 2022, 23(8): 639-651.

@article{title="Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation",
author="Xiao-wu TANG, Wei-kang LIN, Yuan ZOU, Jia-xin LIANG, Wen-fang ZHAO",
journal="Journal of Zhejiang University Science A",
volume="23",
number="8",
pages="639-651",
year="2022",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2100585"
}

%0 Journal Article
%T Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation
%A Xiao-wu TANG
%A Wei-kang LIN
%A Yuan ZOU
%A Jia-xin LIANG
%A Wen-fang ZHAO
%J Journal of Zhejiang University SCIENCE A
%V 23
%N 8
%P 639-651
%@ 1673-565X
%D 2022
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2100585

TY - JOUR
T1 - Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation
A1 - Xiao-wu TANG
A1 - Wei-kang LIN
A1 - Yuan ZOU
A1 - Jia-xin LIANG
A1 - Wen-fang ZHAO
J0 - Journal of Zhejiang University Science A
VL - 23
IS - 8
SP - 639
EP - 651
%@ 1673-565X
Y1 - 2022
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2100585


Abstract: 
In this study, we propose a drainage pipe pile under vacuum consolidation to integrate foundation treatment and pile foundation engineering in soft soil areas. To study its bearing capacity characteristics and foundation treatment performance, single pile static load tests, vane shear tests, and water content tests were carried out for ordinary piles, perforated piles, and drainage pipe piles under conditions of static and vacuum consolidation. Based on the results, the concept of strong and weak reinforcement areas was proposed and used for bearing capacity prediction. The results showed that the drainage pipe pile did not become silted under vacuum consolidation. The single pile bearing capacity was much higher than that of an ordinary pile, and the pile side friction was exerted mainly in the middle and lower parts. Good results were achieved using the shear strength at the junction of the strong and weak reinforcement areas to estimate the ultimate bearing capacity of a single pile. This study provided important insights into the design and construction of drainage pipe piles in a soft soil foundation.

真空固结排水管桩承载力试验研究

作者:唐晓武1,2,林维康1,2,邹渊1,2,梁家馨1,2,赵文芳1,2
机构:1浙江大学,滨海与城市岩土工程研究中心,中国杭州,310058;2浙江省城市地下空间开发工程研究中心,中国杭州,310058
目的:为进一步促进地基处理与桩基工程的结合,本文提出真空固结排水管桩。通过与普通桩与开孔桩对比,研究真空固结排水管桩的承载力增长趋势、桩侧摩阻力分布、桩周土抗剪强度与含水量的变化规律等,为真空固结排水管桩应用与实际工程提供理论依据。
创新点:1.提出了一种能加快软土固结且不会发生淤堵的地基处理与桩基工程相结合的真空固结排水管桩;2.通过承载力、含水量、十字板剪切等试验定义了真空固结排水管桩对桩周土的强(弱)增强区,并利用该定义修正规范,提出了一种单桩极限承载力估算方法。
方法:1.对静压和真空预压条件下的管桩、钻孔桩和排水管桩进行单桩静载试验、十字板剪切试验和含水量试验;2.根据试验结果,对比分析不同桩型在不同工况下单桩承载力、桩身轴力和桩侧摩阻力的变化规律(图7~9);3.对桩周土体不同位置的抗剪强度和含水量分布进行试验(图11~15)。
结论:1.真空固结排水管桩无淤塞现象;根据单桩静载试验,真空固结排水管桩承载力从普通管桩的89.5N提高到271.5N,提升约3倍(考虑到桩顶密封对真空度的影响以及桩间距对排水固结的影响,实际工程中增长幅度可能会下降);一方面,孔隙水在负压作用下加速排泄,提高了土体的抗剪强度;另一方面,土壤中的细颗粒逐渐聚集到桩壁上,形成一个密实的土层,从而扩大桩径。2.真空固结排水管桩最大桩摩阻力是普通桩的3~4倍,且真空固结改变了摩擦阻力的分布形式;桩侧摩阻力在桩的中下部得到了更好的发挥。3.加固区半径与排水量呈正相关;利用两个区域交界处的抗剪强度来估算单桩的极限承载力可以取得良好的效果。

关键词:排水管桩;软土;固结;承载力;地基处理

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]BergadoDT, BalasubramaniamAS, FanninRJ, et al., 2002. Prefabricated vertical drains (PVDs) in soft Bangkok clay: a case study of the new Bangkok International Airport project. Canadian Geotechnical Journal, 39(2):304-315.

[2]BianXC, FuL, ZhaoC, et al., 2021. Pile foundation of high-speed railway undergoing repeated groundwater reductions. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 22(4):277-295.

[3]CarterJP, BookerJR, YeungSK, 1986. Cavity expansion in cohesive frictional soils. Géotechnique, 36(3):349-358.

[4]CuiXZ, ZhangJ, ChenD, et al., 2018. Clogging of pervious concrete pile caused by soil piping: an approximate experimental study. Canadian Geotechnical Journal, 55(7):999-1015.

[5]GuiMW, BoltonMD, GarnierJ, et al., 1998. Guidelines for cone penetration tests in sand. Centrifuge 98: International Conference, p.155-160.

[6]HuangY, WangJ, MeiGX, 2016. Model experimental study of accelerating dissipation of excess pore water pressure in soil around a permeable pipe pile. Rock and Soil Mechanics, 37(10):2893-2898 (in Chinese).

[7]HuntCE, PestanaJM, BrayJD, et al., 2002. Effect of pile driving on static and dynamic properties of soft clay. Journal of Geotechnical and Geoenvironmental Engineering, 128(1):13-24.

[8]IaiS, 1989. Similitude for shaking table tests on soil-structure-fluid model in 1g gravitational field. Soils and Foundations, 29(1):105-118.

[9]IndraratnaB, SathananthanI, RujikiatkamjornC, et al., 2005. Analytical and numerical modeling of soft soil stabilized by prefabricated vertical drains incorporating vacuum preloading. International Journal of Geomechanics, 5(2):114-124.

[10]JesmaniM, KasraniaA, KamalzareM, et al., 2015. Undrained vertical bearing capacity of pile located near soft clay slope. Journal of Engineering Research, 3(3):21-38.

[11]KimJ, YunSK, KangMS, et al., 2021. Behavior characteristics of single batter pile under vertical load. Applied Sciences, 11(10):4432.

[12]LiCX, XiaoJY, WuWB, et al., 2020. Analysis of 1D large strain consolidation of structured marine soft clays. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 21(1):29-43.

[13]LiuHL, ChenYM, ZhaoN, 2008. Development technology of rigidity-drain pile and numerical analysis of its anti-liquefaction characteristics. Journal of Central South University of Technology, 15:101-107.

[14]MesriG, 2021. Discussion of “field study of pile-prefabricated vertical drain (PVD) interaction in soft clay”. Canadian Geotechnical Journal, 58(5):747.

[15]MOC (Ministry of Construction of the People’s Republic of China), 2008. Technical Code for Building Pile Foundations, JGJ 94-2008. National Standards of the People’s Republic of China(in Chinese).

[16]NgCWW, ShiC, GunawanA, et al., 2015. Centrifuge modelling of heating effects on energy pile performance in saturated sand. Canadian Geotechnical Journal, 52(8):1045-1057.

[17]NiPP, MangalathuS, MeiGX, et al., 2017a. Compressive and flexural behaviour of reinforced concrete permeable piles. Engineering Structures, 147:316-327.

[18]NiPP, MangalathuS, MeiGX, et al., 2017b. Permeable piles: an alternative to improve the performance of driven piles. Computers and Geotechnics, 84:78-87.

[19]NiPP, MangalathuS, MeiGX, et al., 2018. Laboratory investigation of pore pressure dissipation in clay around permeable piles. Canadian Geotechnical Journal, 55(9):1257-1267.

[20]PestanaJM, HuntCE, BrayJD, 2002. Soil deformation and excess pore pressure field around a closed-ended pile. Journal of Geotechnical and Geoenvironmental Engineering, 128(1):1-12.

[21]RandolphMF, CarterJP, WrothCP, 1979. Driven piles in clay—the effects of installation and subsequent consolidation. Géotechnique, 29(4):361-393.

[22]SeedHB, ReeseLC, 1957. The action of soft clay along friction piles. Transactions of the American Society of Civil Engineers, 122(1):731-754.

[23]SuleimanMT, NiLS, RaichA, 2014. Development of pervious concrete pile ground-improvement alternative and behavior under vertical loading. Journal of Geotechnical and Geoenvironmental Engineering, 140(7):04014035.

[24]SunHY, WangJ, WangDF, et al., 2020. Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 21(1):15-28.

[25]TangMX, HuHS, LiuCL, et al., 2020. Comparative experiments on bearing behavior of different types of pipe piles in sand. Rock and Soil Mechanics, 41(S2):1-9 (in Chinese).

[26]TangXW, YuY, ZhouLP, et al., 2015. A Prefabricated Pipe Pile with Drainage and Enlarged Friction Resistance and Its Construction Method. CN Patent 104846809A(in Chinese).

[27]TangXW, YangXQ, YuY, 2019a. Analytical solutions to drained consolidation of porous pipe pile. Rock and Soil Mechanics, 40(4):1248-1254 (in Chinese).

[28]TangXW, LiuJN, YangXQ, et al., 2019b. Theoretical study of dynamic pore water pressure dissipation characteristics of open-hole pipe pile. Rock and Soil Mechanics, 40(9):3335-3343 (in Chinese).

[29]WangXY, 2019. Field test investigation of the pile jacking performance for prefabricated square rigid-drainage piles in saturated silt sandy soils. Advances in Civil Engineering, 2019:4587929.

[30]WoodDM, 2004. Geotechnical Modelling. Spon Press, London, UK.

[31]WuYK, FangL, LiXW, et al., 2006. Technical discussion on tube pile combined with prefabricated strip drain to soft soil treatment. Chinese Journal of Rock Mechanics and Engineering, 25(S2):3572-3576 (in Chinese).

[32]ZhouXP, MeiGX, 2014. Finite element simulation of permeable pipe pile driving considering consolidation process. Rock and Soil Mechanics, 35(S2):676-682 (in Chinese).

[33]ZhuDL, IndraratnaB, PoulosH, et al., 2021. Field study of pile-prefabricated vertical drain (PVD) interaction in soft clay. Canadian Geotechnical Journal, 58(5):748.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

Please provide your name, email address and a comment





Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - 2024 Journal of Zhejiang University-SCIENCE