Full Text:   <1742>

Summary:  <1305>

CLC number: TU46

On-line Access: 2020-01-04

Received: 2019-06-02

Revision Accepted: 2019-12-02

Crosschecked: 2019-12-12

Cited: 0

Clicked: 1900

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Yang Yu

https://orcid.org/0000-0001-8021-4401

-   Go to

Article info.
Open peer comments

Journal of Zhejiang University SCIENCE A 2020 Vol.21 No.1 P.15-28

http://doi.org/10.1631/jzus.A1900227


Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters


Author(s):  Hong-yue Sun, Jun Wang, Dong-fei Wang, Yang Yu, Zhen-lei Wei

Affiliation(s):  Ocean College, Zhejiang University, Zhoushan 316021, China; more

Corresponding email(s):   yang-yu@zju.edu.cn

Key Words:  Robust geotechnical design, Consolidation, Prefabricated vertical drain (PVD) arrangement, Ground improvement


Hong-yue Sun, Jun Wang, Dong-fei Wang, Yang Yu, Zhen-lei Wei. Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters[J]. Journal of Zhejiang University Science A, 2020, 21(1): 15-28.

@article{title="Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters",
author="Hong-yue Sun, Jun Wang, Dong-fei Wang, Yang Yu, Zhen-lei Wei",
journal="Journal of Zhejiang University Science A",
volume="21",
number="1",
pages="15-28",
year="2020",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900227"
}

%0 Journal Article
%T Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters
%A Hong-yue Sun
%A Jun Wang
%A Dong-fei Wang
%A Yang Yu
%A Zhen-lei Wei
%J Journal of Zhejiang University SCIENCE A
%V 21
%N 1
%P 15-28
%@ 1673-565X
%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900227

TY - JOUR
T1 - Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters
A1 - Hong-yue Sun
A1 - Jun Wang
A1 - Dong-fei Wang
A1 - Yang Yu
A1 - Zhen-lei Wei
J0 - Journal of Zhejiang University Science A
VL - 21
IS - 1
SP - 15
EP - 28
%@ 1673-565X
Y1 - 2020
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1900227


Abstract: 
Prefabricated vertical drains (PVDs) are widely used to accelerate the consolidation process within soft ground. The overall degree of consolidation (DOC) of soft ground is highly dependent on the arrangement of PVDs, such as their length and spacing. Nevertheless, only the ranges of spacing and length are recommended in codes and standards, which renders it difficult for designers to determine the appropriate arrangement of PVDs. A method is proposed in this paper to determine the appropriate arrangement of PVDs based upon multiple objectives, such as cost, safety, and design robustness. In this method, the design robustness is evaluated by the signal-to-noise ratio of the overall DOC, which is determined using Monte-Carlo simulation based on the statistics of uncertain soil parameters. A framework is proposed based on the optimal procedure and illustrated with an example. The results indicate that the proposed method can determine the most preferred arrangement of PVDs. Additionally, compared with the traditional deterministic method, it can suggest a series or a unique optimal design when the uncertainties of soil parameters are considered. Furthermore, factors affecting the most preferred arrangement are discussed.

In this paper authors have investigated the effects of PVDs arrangement in proper design of soft soil improvements considering multiple objectives such as cost, safety, and design robustness. Signal-to-noise ratio of overall Degree of Consolidation (DOC) is applied to evaluate design robustness using Monte-Carlo simulations based on statistics of the uncertain soil parameters. The framework is established based on the optimal procedure and illustrated with an example. As expected, authors concluded that the target overall DOC, elapsed time, and the PVD arrangement pattern affects the optimal PVD design when the cost is in the low range, while these influential factors could be disregarded when the cost is high enough. This is overall a very good paper.

考虑土体参数不确定性的软土地基塑料排水板最优化设计

目的:塑料排水板能够有效加速固结过程,因此被广泛应用于软土地基处理. 然而,相关规范只给出了塑料排水板的间距和长度的取值范围,没有给出最优设计. 本文旨在通过考虑土体参数不确定性、施工造价和设计要求三个方面,提出塑料排水板的最优设计.
创新点:1. 通过蒙特卡罗方法求解固结度的信噪比,得到不同设计的鲁棒性; 2. 讨论各种因素对最优设计的影响.
方法:1. 通过理论分析,推导出总固结度鲁棒性的计算公式; 2. 通过定义不同设计组合,讨论不同噪声参数,并运用蒙特卡罗模拟,得到满足要求的所有设计情况的鲁棒性; 3. 分析其他因素(如固结时间和固结度等)对最优设计的影响,并讨论参数变异性和相关性对结果的影响.
结论:1. 基于鲁棒性分析,得到了塑料排水板的最优设计方法. 2. 在低造价条件下,固结度、固结时间和塑料排水板布置形式对最优设计存在影响; 当造价足够高时,该影响可以忽略. 3. 参数变异性和相关性对结果存在影响; 如果低估了参数的变异性,会低估最优设计的造价.

关键词:岩土工程鲁棒性设计; 固结; 塑料排水板布置形式; 地基处理

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

Reference

[1]Azari B, Fatahi B, Khabbaz H, 2016. Assessment of the elastic-viscoplastic behavior of soft soils improved with vertical drains capturing reduced shear strength of a disturbed zone. International Journal of Geomechanics, 16(1):B4014001.

[2]Bergado DT, Asakami H, Alfaro MC, et al., 1991. Smear effects of vertical drains on soft Bangkok clay. Journal of Geotechnical Engineering, 117(10):1509-1530.

[3]Bergado DT, Alfaro MC, Balasubramaniam AS, 1993. Improvement of soft Bangkok clay using vertical drains. Geotextiles and Geomembranes, 12(7):615-663.

[4]Bergado DT, Balasubramaniam AS, Fannin RJ, 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.

[5]Berry PL, Wilkinson WB, 1969. The radial consolidation of clay soils. Géotechnique, 19(2):253-284.

[6]Carrillo N, 1942. Simple two and three dimensional case in the theory of consolidation of soils. Journal of Mathematics and Physics, 21(1-4):1-5.

[7]Chai JC, Miura N, 1999. Investigation of factors affecting vertical drain behavior. Journal of Geotechnical and Geoenvironmental Engineering, 125(3):216-226.

[8]Chen J, Shen SL, Yin ZY, et al., 2016. Evaluation of effective depth of PVD improvement in soft clay deposit: a field case study. Marine Georesources & Geotechnology, 34(5):420-430.

[9]Cherubini C, Christian JT, Baecher GB, et al., 2001. Factor of safety and reliability in geotechnical engineering. Journal of Geotechnical and Geoenvironmental Engineering, 127(8):700-721.

[10]Deb K, Gupta S, 2011. Understanding knee points in bicriteria problems and their implications as preferred solution principles. Engineering Optimization, 43(11):1175-1204.

[11]Deb K, Pratap A, Agarwal S, et al., 2002. A fast and elitist multiobjective genetic algorithm: NSGA-II. IEEE Transactions on Evolutionary Computation, 6(2):182-197.

[12]Duncan JM, 2000. Factors of safety and reliability in geotechnical engineering. Journal of Geotechnical and Geoenvironmental Engineering, 126(4):307-316.

[13]Geng XY, Indraratna B, Rujikiatkamjorn C, 2011. Effectiveness of partially penetrating vertical drains under a combined surcharge and vacuum preloading. Canadian Geotechnical Journal, 48(6):970-983.

[14]Gong WP, Wang L, Juang CH, et al., 2014. Robust geotechnical design of shield-driven tunnels. Computers and Geotechnics, 56:191-201.

[15]Gong WP, Juang CH, Khoshnevisan S, et al., 2016. R-LRFD: load and resistance factor design considering robustness. Computers and Geotechnics, 74:74-87.

[16]Hansbo S, 1979. Consolidation of clay by band-shaped prefabricated drains. Ground Engineering, 12(5):16-25.

[17]Hansbo S, Jamiolkowski M, Kok L, 1981. Consolidation by vertical drains. Géotechnique, 31(1):45-66.

[18]Heo Y, Bae W, 2013. A statistical evaluation of consolidation properties of marine clay in South Korea. Marine Georesources & Geotechnology, 31(3):209-224.

[19]Ho L, Fatahi B, Khabbaz H, 2015. A closed form analytical solution for two-dimensional plane strain consolidation of unsaturated soil stratum. International Journal for Numerical and Analytical Methods in Geomechanics, 39(15):1665-1692.

[20]Juang CH, Wang L, 2013. Reliability-based robust geotechnical design of spread foundations using multi-objective genetic algorithm. Computers and Geotechnics, 48:96-106.

[21]Juang CH, Wang L, Hsieh HS, et al., 2014. Robust geotechnical design of braced excavations in clays. Structural Safety, 49:37-44.

[22]Khoshnevisan S, Gong WP, Wang L, et al., 2014. Robust design in geotechnical engineering–an update. Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 8(4):217-234.

[23]Kim YT, Nguyen BP, Yun DH, 2018a. Analysis of consolidation behavior of PVD-improved ground considering a varied discharge capacity. Engineering Computations, 35(3):1183-1202.

[24]Kim YT, Nguyen BP, Yun DH, 2018b. Effect of artesian pressure on consolidation behavior of drainage-installed marine clay deposit. Journal of Materials in Civil Engineering, 30(8):04018156.

[25]Leclair DG, 1988. Prediction of Embankment Performance Using In-situ Tests. MS Thesis, University of British Columbia, Vancouver, Canada.

[26]Li YC, Tong X, Chen Y, et al., 2018. Non-monotonic piezocone dissipation curves of backfills in a soil-bentonite slurry trench cutoff wall. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 19(4):277-288.

[27]MOC (Ministry of Construction of the People’s Republic of China), 2002. Technical Code for Ground Treatment of Buildings, JGJ 79-2002. National Standards of People’s Republic of China (in Chinese).

[28]Nguyen BP, Yun DH, Kim YT, 2018. An equivalent plane strain model of PVD-improved soft deposit. Computers and Geotechnics, 103:32-42.

[29]Ong CY, Chai JC, Hino T, 2012. Degree of consolidation of clayey deposit with partially penetrating vertical drains. Geotextiles and Geomembranes, 34:19-27.

[30]Parsa-Pajouh A, Fatahi B, Vincent P, et al., 2014. Trial embankment analysis to predict smear zone characteristics induced by prefabricated vertical drain installation. Geotechnical and Geological Engineering, 32(5):1187-1210.

[31]Parsa-Pajouh A, Fatahi B, Khabbaz H, 2016. Experimental and numerical investigations to evaluate two-dimensional modeling of vertical drain-assisted preloading. International Journal of Geomechanics, 16(1):B4015003.

[32]Phadke MS, 1989. Quality engineering using design of experiments. In: Dehnad K (Ed.), Quality Control, Robust Design, and the Taguchi Method. Springer, Boston, USA, p.31-50.

[33]Rixner JJ, Kraemer SR, Smith AD, 1986. Prefabricated Vertical Drains: Engineering Guidelines. Federal Highway Administration, Washington DC, USA.

[34]Terzaghi K, 1944. Theoretical Soil Mechanics. Chapman and Hali Ltd., John Wiler and Sons, Inc., New York, USA.

[35]Terzaghi K, Peck RB, Mesri G, 1996. Soil Mechanics in Engineering Practice, 3rd Edition. John Wiley & Sons, New York, USA.

[36]Tran-Nguyen HH, Edil TB, 2011. The characteristics of PVD smear zone. In: Han J, Alzamora DE (Eds.), Geo-frontiers 2011: Advances in Geotechnical Engineering. ASCE, Dallas, USA, p.748-757.

[37]Vu VT, 2015. Optimal layout of prefabricated vertical drains. International Journal of Geomechanics, 15(3):06014020.

[38]Wang Z, Yu Y, Sun HY, et al., 2019. Robust optimization of the constructional time delay in the design of double-row stabilizing piles. Bulletin of Engineering Geology and the Environment.

[39]Yu Y, Shen MF, Sun HY, et al., 2019. Robust design of siphon drainage method for stabilizing rainfall-induced landslides. Engineering Geology, 249:186-197.

[40]Yuan XQ, Wang Q, Lu WX, et al., 2018. Indoor simulation test of step vacuum preloading for high-clay content dredger fill. Marine Georesources & Geotechnology, 36(1):83-90.

[41]Zhang J, Wang H, Huang HW, et al., 2017. System reliability analysis of soil slopes stabilized with piles. Engineering Geology, 229:45-52.

[42]Zheng G, Liu JJ, Lei HY, et al., 2017. Improvement of very soft ground by a high-efficiency vacuum preloading method: a case study. Marine Georesources & Geotechnology, 35(5):631-642.

[43]Zhou H, Liu HL, Zha YH, et al., 2017. A general semi-analytical solution for consolidation around an expanded cylindrical and spherical cavity in modified cam clay. Computers and Geotechnics, 91:71-81.

[44]Zou SF, Li JZ, Xie XY, 2018. A semi-analytical solution for one-dimensional elasto-viscoplastic consolidation of layered soft clay. Applied Clay Science, 153:9-15.

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 - 2022 Journal of Zhejiang University-SCIENCE