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http://dx.doi.org/10.7843/kgs.2021.37.11.93

Experimental Evaluation of the Effect of Fine Contents on the Formation of Underground Cavities and Ground Cave-ins by Damaged Sewer Pipes  

Kwak, Tae-Young (Dept. of Geotechincal Engrg. Research, Korea Institute of Civil Engrg. and Building Technology)
Lee, Seung-Hwan (Korea Construction Standard Center, Korea Institute of Civil Engrg. and Building Technology)
Chung, Choong-Ki (Dept. of Civil & Environmental Engrg., Seoul National Univ.)
Baek, Sung-Ha (Dept. of Geotechincal Engrg. Research, Korea Institute of Civil Engrg. and Building Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.11, 2021 , pp. 93-105 More about this Journal
Abstract
In this study, we evaluated the effect of soil fine contents on the formation of underground cavities and ground cave-ins induced by damaged sewer pipes. Simulating the domestic rainfall conditions and ground conditions, model tests were performed under three different fine particle contents conditions (7.5%, 15%, and 25%). By repeating the groundwater supply and drainage twice, ground settlement and the amount of discharged soil were obtained. Also, digital images were taken at regular time intervals during the model tests, and internal displacement and deformation were measured using PIV technique. As the cycles were repeated, the soil with high fine content showed greater resistance to the formation of underground cavities. The ground cave-ins, identified by the collapse of the surface, occurred only when the fine particle content was 15%. It is presumed to be due to the suffusion phenomenon; further study was needed to investigate the effect of fine particle contents on the suffusion phenomenon and associated changes of soil strength.
Keywords
Ground cavity; Ground cave-in; Model test; Sewer pipe; Fine contents; PIV technique;
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