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On-line Access: 2023-03-31

Received: 2022-04-04

Revision Accepted: 2022-09-26

Crosschecked: 2023-03-31

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Tuo WANG

https://orcid.org/0000-0001-6884-2763

Feng-shou ZHANG

https://orcid.org/0000-0002-4998-6259

Pei WANG

https://orcid.org/0000-0003-3835-2477

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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.4 P.319-331

http://doi.org/10.1631/jzus.A2200198


Experimental and numerical study of seepage-induced suffusion under K0 stress state


Author(s):  Tuo WANG, Feng-shou ZHANG, Pei WANG

Affiliation(s):  Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; more

Corresponding email(s):   fengshou.zhang@tongji.edu.cn

Key Words:  Suffusion, Gap-graded soil, Discrete element method (DEM), Dynamic fluid mesh (DFM)


Tuo WANG, Feng-shou ZHANG, Pei WANG. Experimental and numerical study of seepage-induced suffusion under K0 stress state[J]. Journal of Zhejiang University Science A, 2023, 24(4): 319-331.

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journal="Journal of Zhejiang University Science A",
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pages="319-331",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200198"
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Abstract: 
suffusion in gap-graded soil involves selective erosion of fine particles through the pores formed by coarse particles under seepage forces. As the fines content (FC) decreases, the hydraulic and mechanical behavior of the soil will change, posing a huge threat to engineering safety. In this study, we first conduct a series of experimental tests of suffusion by using gap-graded soils and then analyze the evolution process of suffusion and the effect of the hydraulic gradient. Subsequently, according to the physical model, a discrete element method (DEM) numerical model with dynamic fluid mesh (DFM) is developed to extend the experimental study to the pore scale. Our results reveal the migration process of fines and the formation of erosion zones. A parametric study is then conducted to investigate the effect of the hydraulic gradient, FC, and K0 pressure (which limits the lateral displacement of the sample and applies vertical pressure) on eroded weight. The results show that the eroded weight increases with the increase of the hydraulic gradient and FC but decreases with the increase of K0 pressure.

K0应力状态下渗流潜蚀试验与数值研究

作者:王拓1,2,张丰收1,2,王培3
机构:1同济大学,岩土与地下工程教育部重点实验室,中国上海,200092;2同济大学,土木工程学院,地下工程系,中国上海,200092;3香港理工大学,土木与环境工程系,中国香港,999077
目的:目前,潜蚀过程并不能被直接观察到。本研究期望采用透明仪器直接观察潜蚀的演化过程,探讨K0应力状态下间断级配土的潜蚀过程。
创新点:1.研制出一个透明潜蚀仪器,可直接观测间断级配土的潜蚀过程;2.建立数值模型,扩展试验参数,在颗粒尺度上解释潜蚀规律。
方法:1.采用透明的潜蚀仪器,直接观测间断级配土的潜蚀过程,并记录潜蚀质量;2.通过离散元数值模拟的方法,在颗粒尺度上揭示颗粒的迁移规律。
结论:1.随着侵蚀的进行,试样内部形成侵蚀带并逐渐扩大;从力链分析可知,细颗粒在水流作用下逐渐堆积在粗颗粒形成的孔隙中,并被粗颗粒堵塞。2.当侵蚀和阻塞区形成时,流速也逐渐局部化;在侵蚀区,孔隙度增大,流速普遍较快,但在阻塞区,流速较慢。3.参数分析表明,最终潜蚀重量与水力梯度呈正相关关系,且潜蚀重量随K0压力的增大而减小;随着细粉含量的增加,潜蚀重量增加。

关键词:潜蚀;间断级配土;离散元法(DEM);动态流体网格(DFM)

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

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