Experimental study of suffusion characteristics within granite residual soil controlling inflow velocity
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ORIGINAL PAPER
Experimental study of suffusion characteristics within granite residual soil controlling inflow velocity Weiping Liu 1 & Shaofeng Wan 1 & Xiaoyan Luo 2 & Mingfu Fu 3,4 Received: 6 October 2018 / Accepted: 31 October 2020 # Saudi Society for Geosciences 2020
Abstract Suffusion is a particular case of internal erosion due to water seepage through a porous media, which is a main cause of the failure of dam and embankment. There are a lot more to understand due to its inherent complexity. In order to study the development of suffusion, a test device taken into account inflow velocity is designed to simulate the suffusion process in this paper. Three laboratory tests on granite residual soil are presented aimed at investigating the suffusion erosion of fine particles from soil samples subjected to a controlled inflow velocity. The processes of erosion can be observed during the tests. The variation of wetting front, moisture, and erosion amount under different inflow velocities is measured to study the effect of inflow velocity on suffusion within granite residual soil which has high contents of fine particles. As the inflow velocity increases, the wetting speed of the wetting front will increase, and the erosion amount will also increase. The larger inflow velocity would lead to the higher extent of suffusion. The soil column will form preferential channels or fine particle redeposition, which will cause the soil moisture content to fluctuate. The suffusion process in granite residual soil includes fine particles erosion, reposition, pore clogging, and flushing. Keywords Internal erosion . Suffusion . Granite residual soil . Laboratory test . Inflow velocity
Introduction Internal erosion occurs when soil fine particles are separated from the soil matrix by water seepage. It is a major cause of Editorial Responsibility: Zhen-Dong Cui * Weiping Liu [email protected] Shaofeng Wan [email protected] Xiaoyan Luo [email protected] Mingfu Fu [email protected] 1
School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
2
School of Civil Engineering and Architecture, Jiangxi Science and Technology Normal University, Nanchang 330013, China
3
Gongqing Institute of Science and Technology, Gongqing 332020, China
4
School of Civil Engineering and Architecture, Nanchang Institute of Technology, Nanchang 330099, China
the failure of hydraulic earthen structures, such as dams and embankment (Xiao and Shwiyhat 2012; Zhang and Chen 2006). Suffusion is a type of internal erosion and a non-local phenomenon in which fine particles are transported within the matrix of the coarse particles under seepage (Fannin and Slangen 2014). Suffusion may yield a loss of fine particles and instigate a process of undermining (Moffat and Fannin 2006). The soil is gradually eroded, and the suffusion channels will develop. Such loss of fine soil particles affects the hydraulic and the mechanical properties of the soil (Aboul Hosn et al. 2018) and leads to failure of dams and embankments (Chang and Z
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