One-dimensional large strain electroosmotic consolidation of ultra-soft geomaterials

IF 1.3 Q3 ENGINEERING, GEOLOGICAL Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-02-13 DOI:10.1680/jgrim.22.00050

Yu Guo, J. Q. Shang

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Abstract

Electrokinetic (EK) has been proven to effectively consolidate ultra-soft geomaterials, such as coal washeries, mine tailings, oil sands tailings, etc. The conventional consolidation model based on the small strain theory encountered difficulties with these geomaterials because of continuous changes in material properties during consolidation. This research developed a one-dimensional large strain EK consolidation model (LSEK-1D) for ultra-soft geomaterials. The model is validated using experimental laboratory results regarding settlements and times on mature fine oil sand tailings (MFT), a major environmental challenge for the oil industry in Northern Alberta, Canada. Moreover, the effects of initial sample heights and applied current densities on consolidation times are evaluated. The experimental data on consolidation times of MFT is consistent with the LSEK-1D model. The LSEK-1D model was used to find the scale effect of drainage path on the EK consolidation behavior of MFT. The model can also be used for other ultra-soft geomaterials and to facilitate the geotechnical engineering design for EK application.

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超软岩土材料一维大应变电渗固结

电动(EK)已被证明可以有效地固结超软岩土材料，如洗煤厂、矿山尾矿、油砂尾矿等。基于小应变理论的传统固结模型由于固结过程中材料性质的不断变化而遇到了困难。本研究建立了超软岩土材料一维大应变EK固结模型(LSEK-1D)。该模型使用实验室实验结果验证了成熟细油砂尾矿(MFT)的沉降和时间，MFT是加拿大阿尔伯塔省北部石油工业面临的主要环境挑战。此外，评估了初始样品高度和施加电流密度对固结时间的影响。MFT固结次数的实验数据与LSEK-1D模型一致。采用LSEK-1D模型研究排水路径对MFT EK固结行为的尺度效应。该模型也可用于其他超软岩土材料，并为EK应用的岩土工程设计提供方便。

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来源期刊

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.