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On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2019-12-12

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 ORCID:

Yang Yu

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

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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.

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author="Hong-yue Sun, Jun Wang, Dong-fei Wang, Yang Yu, Zhen-lei Wei",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900227"
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%T Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters
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%A Dong-fei Wang
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A1 - Hong-yue Sun
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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

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