Evaluation of the internal stability of well-graded silty sand through the long-term seepage test

International Journal of Geo-Engineering

In-Hyun Kim¹  Choong-Ki Chung¹  Hee-Jun Lee¹ 

[1] Department of Civil and Environmental Engineering, Seoul National University, 08826, Seoul, South Korea;

关键词: Internal erosion;    Internal instability;    Suffusion;    Well-graded silty sand;   

DOI  :  10.1186/s40703-021-00151-6

来源: Springer

【 摘 要 】

Suffusion is the phenomenon responsible for internal erosion, and is the process by which finer soil particles are moved through the constrictions between the larger soil particles by seepage forces. Generally, gap-graded soil is known to be susceptible to suffusion. Meanwhile, suffusion of well-graded silty sand and the resulting soil behavior are not well understood. Moreover, the previous researches on laboratory suffusion tests focused on the study of the critical hydraulic gradient, which triggers the internal instability of the soils within a short period of time. Therefore, in this study, long-term suffusion tests were conducted on well-graded silty sand under a hydraulic gradient lower than the critical value. As a result, abrupt increases in permeability and amount of soil discharged were observed due to the progressive migration of the soil particles, resulting in suffusion even at a relatively low hydraulic gradient.

【 授权许可】

CC BY