Experimental study on suffusion and contact erosion in double-layered alluvial foundation with a cut-off wall

Acta Geotechnica - Tập 18 Số 11 - Trang 6077-6095 - 2023
Zhang, Xingjie1,2, Benamar, Ahmed2, Oueidat, Mohamad2, Luo, Yulong1
1College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China
2Normandie University, UNIHAVRE, CNRS, LOMC, Le Havre, France

Tóm tắt

Suffusion is defined as fine soil particles' detachment by hydraulic forces and their subsequent transport through pre-existing pores between the coarse particles. Contact erosion would occur at the interface between two soil layers if the coarse–fine soil combinations were submitted to a flow parallel to the interface. In some foundations with complex soil structures, suffusion and contact erosion can interact simultaneously, especially in double-layered or multilayered soil foundations with a cut-off wall. To describe the progression of suffusion and contact erosion, investigate the interaction between them, and explore the influence of retention ratio (Dc35/d85SA) between soil layers, nine double-layered internal erosion tests were performed in this study. The results reveal that the effect of the retention ratio on suffusion and contact erosion in double-layered alluvial foundation with a cut-off wall exhibits a consistent trend. Specifically, at both the onset of erosion and blowout, when Dc35/d85SA < 1, the critical hydraulic gradients increased at almost a constant value of Dc35/d85SA, in contrast, as Dc35/d85SA exceeds 1, a corresponding decrease in the critical hydraulic gradients was observed. Besides, when Dc35/d85SA < 1, the initial mode of erosion was contact erosion at the downstream interface; when Dc35/d85SA > 1, the initial mode of failure was either suffusion at the tip of the cut-off wall or simultaneous suffusion and contact erosion.

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