Experimental study on the suffusion mechanism of gap-graded soils under an exceedance hydraulic gradient

Liang Chen, Yu Wan (), Jian-Jian He, Chun-Mu Luo, Shu-Fa Yan and Xian-Feng He
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Liang Chen: Hohai University
Yu Wan: Hohai University
Jian-Jian He: Zhejiang University
Chun-Mu Luo: State Grid Changzhou City Jintan District Electric Power Supply Company
Shu-Fa Yan: Hohai University
Xian-Feng He: Yellow River Institute of Hydraulic Research

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 109, issue 1, No 19, 405-439

Abstract: Abstract Suffusion is an important mechanism initiating internal erosion in geotechnical structures. This paper studies the suffusion mechanism of gap-graded soils during the whole suffusion process under an exceedance hydraulic gradient. We define the exceeded critical ratio Ri and study the change in the parameters such as the flow velocity, hydraulic conductivity, and fine particle loss with Ri. Under steady flow, a formula for determining the flow velocity state of the sample with Ri according to the fine particle content and relative density of the sample was proposed; during the suffusion process, the influence of Rimax on the rate at which the flow velocity and hydraulic conductivity of the sample increase as Ri decreases was greater than that of the initial relative density and the initial fine particle content of the sample. Under unsteady flow, a larger initial relative density corresponds to a smaller amplitude of increase in the average value of the peak flow velocity with increasing Ri. Compared with the test under steady flow, the flow velocity under unsteady flow would experience abrupt changes. The relative position of the trend line L of the flow velocity varying with Ri under unsteady flow and the fixed peak water head height point A under steady flow was related to the relative density of the sample.

Keywords: Suffusion; Exceedance hydraulic gradient; Flow velocity; Fine content; Relative density (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04842-2

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