Fully coupled large-strain radial consolidation analysis for dredged marine slurry treated by prefabricated vertical drain with vacuum and heat preloading

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2024-10-29 DOI:10.1016/j.compgeo.2024.106852

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引用次数: 0

Abstract

The use of prefabricated vertical drain (PVD) in conjunction with vacuum and heat preloading is an effective improvement approach for dredged marine slurry. Despite it being a typical large-strain thermal-hydro-mechanical (THM) problem, there is currently a lack of reliable large-strain analysis methods for this problem. This study therefore develops a large-strain radial consolidation model, considering a thermal elastoplastic constitutive model of soft clays, self-weight of dredged slurry, radial and vertical flows, nonlinear hydraulic conductivity, nonlinear compressibility during the consolidation process, heat conduction, and heat convection process. The modified alternative direction implicit (ADI) difference approach is used to solve the proposed model. The numerical algorithm is then verified by degraded verification with a well-established radial-large strain consolidation model. A laboratory experiment has been employed to show the effectiveness of the proposed model in predicting the consolidation behavior. A graphical user interface (GUI) has been programmed for potential users based on the proposed model and numerical algorithm. The results indicate that heat preloading improves the permeability of soil, resulting in a larger settlement of soil. Heat preloading serves as an effective method to enhance the efficiency of PVD.

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采用预制垂直排水器处理疏浚海水泥浆的全耦合大应变径向固结分析

使用预制垂直排水器 (PVD) 并结合真空和热预载是一种有效的疏浚海水泥浆改进方法。尽管这是一个典型的大应变热-水-机械（THM）问题，但目前缺乏可靠的大应变分析方法。因此，本研究开发了一种大应变径向固结模型，考虑了软粘土的热弹塑性构成模型、疏浚泥浆的自重、径向和垂直流、非线性水力传导、固结过程中的非线性可压缩性、热传导和热对流过程。该模型采用修正的替代方向隐式（ADI）差分法求解。然后，利用成熟的径向大应变固结模型对数值算法进行降级验证。实验室实验证明了所提模型在预测固结行为方面的有效性。根据所提出的模型和数值算法，为潜在用户设计了图形用户界面（GUI）。结果表明，热预载可改善土壤的渗透性，从而使土壤产生更大的沉降。热预载是提高 PVD 效率的有效方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.