globalchange  > 气候变化与战略
DOI: 10.1007/s11069-021-04842-2
论文题名:
Experimental study on the suffusion mechanism of gap-graded soils under an exceedance hydraulic gradient
作者: Chen L.; Wan Y.; He J.-J.; Luo C.-M.; Yan S.-F.; He X.-F.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
语种: 英语
中文关键词: Exceedance hydraulic gradient ; Fine content ; Flow velocity ; Relative density ; Suffusion
英文摘要: 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. © 2021, The Author(s), under exclusive licence to Springer Nature B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168949
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Geomechanics and Embankment Engineering, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; Geotechnical Research Institute of Hohai University, Nanjing, Jiangsu 210098, China; Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310058, China; Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou, Zhejiang 310058, China; State Grid Changzhou City Jintan District Electric Power Supply Company, Changzhou, Jiangsu 213200, China; Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China

Recommended Citation:
Chen L.,Wan Y.,He J.-J.,et al. Experimental study on the suffusion mechanism of gap-graded soils under an exceedance hydraulic gradient[J]. Natural Hazards,2021-01-01
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