Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (10): 2726-2734.doi: 10.16285/j.rsm.2021.2037

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study on internal erosion behaviors under fluctuating hydraulic condition using transparent soil

DENG Ze-zhi1, 2, JI En-yue1, WANG Gang2   

  1. 1. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210024, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-12-03 Revised:2022-06-23 Online:2022-10-19 Published:2022-10-17
  • Supported by:
    This work was supported by the Open Research Fund of Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources (YK321005), the Graduate Scientific Research and Innovation Foundation of Chongqing, China (CYS20021) and the Natural Science Foundation of Chongqing (cstc2021 jcyj-msxmX0598).

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Abstract: Internal erosion is a phenomenon that fine particles migrate through the channels within coarse matrix under seepage flow. Previous studies mainly focused on the internal erosion under steady hydraulic gradient, while the behavior and mesoscopic mechanism of internal erosion under fluctuating hydraulic condition were paid little attention. In this study, a setup of transparent soil seepage test was developed. Seepage tests of two kinds of soils with different internal stabilities were conducted under steady and fluctuating hydraulic conditions respectively to investigate the internal erosion behaviors under fluctuating hydraulic condition. The macroscopic experimental phenomenon showed that, when the hydraulic gradient exceeded the critical hydraulic gradient, the increase of the hydraulic conductivity under fluctuating hydraulic condition was faster than that under steady hydraulic condition for internally unstable soil, manifesting that hydraulic fluctuation aggravated the migration of fines. In order to further reveal the mesoscopic mechanism, a three-dimensional reconstruction method was employed to rebuild the mesoscopic fabric of soil based on the two-dimensional cross-sectional images obtained by the planar laser scanning; and a three-dimensional visualization digital model including coarse matrix, inter-granular pore channels and fine particles was established. By observing the distribution of fine particles in pore channels, it was found that fine particles might clog and accumulate at narrow pore throats under steady seepage. While the perturbation caused by hydraulic fluctuation could break these weak stable structures of clog and accumulation, and then restart the migration process of fine particles.

Key words: internal erosion, hydraulic condition, transparent soil, 3D reconstruction, mesoscopic mechanism

CLC Number: 

  • TU 411.4
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