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http://dx.doi.org/10.14481/jkges.2020.21.9.25

Engineering Characteristics of Liquid Filler Using Marine Clay and In-situ Soil  

Oh, Sewook (Department of Construction & Disaster Prevention Engineering, Kyungpook National University)
Bang, Seongtaek (Department of Construction & Disaster Prevention Engineering, Kyungpook National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.21, no.9, 2020 , pp. 25-32 More about this Journal
Abstract
The underground utilities installed under the ground is an important civil engineering structure, such as water supply and sewerage pipes, underground power lines, various communication lines, and city gas pipes. Such underground utilities can be exposed to risk due to external factors such as concentrated rainfall and vehicle load, and it is important to select and construct an appropriate backfill material. Currently, a method mainly used is to fill the soil around the underground utilities and compact it. But it is difficult to compact the lower part of the buried pipe and the compaction efficiency decreases, reducing the stability of the underground utilities and causing various damages. In addition, there are disadvantages such as a decrease in ground strength due to disturbance of the ground, a complicated construction process, and construction costs increase because the construction period becomes longer, and civil complaints due to traffic restrictions. One way to solve this problem is to use a liquid filler. The liquid filler has advantages such as self-leveling ability, self-compaction, fluidity, artificial strength control, and low strength that can be re-excavated for maintenance. In this study, uniaxial compression strength test and fluidity test were performed to characterize the mixed soil using marine clay, stabilizer, and in-situ soil as backfill material. A freezing-thawing test was performed to understand the strength characteristics of the liquid filler by freezing, and in order to examine the effect of the filling materials on the corrosion of the underground pipe, an electrical resistivity test and a pH test were performed.
Keywords
Underground utility; Fluidity test; Freezing-thawing; Electrical resistivity;
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