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Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential

考虑土体电势分布影响的真空预压联合电渗耦合解析解

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Abstract

Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods. Many studies indicate that the soil electrical potential is non-linearly distributed in the treatment process by the combined method. However, in the previous theoretical study, the non-linear-distribution impacts of soil’s electrical potential on soft soil foundation treatment have not been considered. It is always assumed to be linear distribution, which is different from the experimental results. In this paper, the coupling consolidation model of this technology under the two-dimensional plane strain condition is initially established; and the well resistance effect, the vacuum load decreasing along the soil depth and the non-linear variation of electrical potential in the soil are considered. Then, the analytical solutions of the average excess pore water pressure and soil’s consolidation degree in the anode affected area are acquired based on the soil’s electrical potential distribution. Finally, the rationality of the analytical solution is testified by conducting an experimental model test, which proves the scientificity of the analytical solution. The analytical solution is adopted to better predict the dissipation of excess pore water pressure and soil consolidation degree when using the combined technology. This study can provide a reference with more accuracy for the engineering practices of this combined technology in the future.

摘要

真空预压联合电渗加固技术能够充分发挥真空预压法和电渗法的优势,进而有效改善软基处理 效果。研究表明,当采用真空预压联合电渗法加固软基时,土体电势呈现非线性分布规律。然而,目 前有关该联合加固技术的理论研究尚未考虑土体电势非线性分布对软基处理过程的影响且在理论推 导中通常假设土体电势为线性分布,显然,这与试验结果有所出入。对此,本文首先以阳极为研究对 象建立了二维平面应变条件下真空预压联合电渗法耦合固结模型。在模型中考虑了井阻效应、真空荷 载沿土层深度衰减以及土体电势非线性变化的影响。然后,基于实际土体电势分布规律分别给出了阳 极影响区域内平均超静孔隙水压力和土体固结度的理论解析解。最后,结合具体的模型试验案例对该 解析解的合理性进行了验证,证明了该解析解的准确性和科学性。该解析解能够合理预测真空预压联 合电渗法处理过程中超静孔隙水压力和土体固结度的变化情况,能够为真空预压联合电渗加固技术后 续的工程运用提供借鉴和参考。

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210024, China

    Jian-ting Feng  (冯建挺), Yang Shen  (沈扬) & Wen Shi  (施文)

  2. School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK

    Jian-ting Feng  (冯建挺)

  3. College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China

    Jun-hong Xu  (许俊红)

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  1. Jian-ting Feng  (冯建挺)
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  2. Yang Shen  (沈扬)
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  3. Jun-hong Xu  (许俊红)
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  4. Wen Shi  (施文)
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Contributions

FENG Jian-ting provided the concept and edited the draft of manuscript. SHEN Yang carried out data processing, performed data analysis, and contributed to the paper writing. XU Jun-hong author contributed a lot in the related work of modification and beautification of the figures, as well as polishing of the language. SHI Wen conducted the literature review.

Corresponding author

Correspondence to Yang Shen  (沈扬).

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Conflict of interest

FENG Jian-ting, SHEN Yang, XU Jun-hong and SHI Wen declare that they have no conflict of interest.

Foundation item: Project(51979087) supported by the National Natural Science Foundation of China; Project(BK20180776) supported by the Jiangsu Natural Science Foundation, China; Project(202006710002) supported by the China Scholarship Council

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Feng, Jt., Shen, Y., Xu, Jh. et al. Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential. J. Cent. South Univ. 28, 2544–2555 (2021). https://doi.org/10.1007/s11771-021-4785-8

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