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http://dx.doi.org/10.7843/kgs.2012.28.10.41

Improvement of Shallow Soil Using Electric Heating Equipment  

Park, Min-Cheol (Dept, of Civil Engrg., Kumoh National Institute of Technology)
Im, Eun-Sang (Infrastructure Technology Center, K-Water Institute, KOWACO)
Shin, Beck-Chul (Civil Works & The Environment Division, Hanwha Engrg. & Construction Corp.)
Han, Heui-Soo (Dept, of Civil Engrg., Kumoh National Institute of Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.28, no.10, 2012 , pp. 41-54 More about this Journal
Abstract
This paper is to develop the method of surface soil improvement by electric heating equipment. For this purpose, the electric heating systems were invented to apply to the in-situ soil. Iaboratory tests were done to study the behaviors of sea clays by eletric heating. In lab tests, two different heating temperatures, $70^{\circ}C$ and $110^{\circ}C$, were applied to the saturated clays to examine the relationship between evaporation and compaction. In addition, trafficability was analyzed to the heated by applying cone penetrometer to the heated clays Furthermore, in-situ tests were conducted to analyze the range of soil improvement and strength variations. The temperature changes in field were measured and they were compared with those of the commercial program (Temp/W). Also, the bearing capacities of electrically heated field were tested by PBT (plate bearing test). Several conclusions were derived from the results of the numerical analysis and tests (lab and field). The improvement ranges and strength variations of electrically heated soil depended on the heating temperature and time. If the heating temperature is more than $100^{\circ}C$ evaporating the ground water, the bearing capacity and settlement increased rapidly. The bearing capacities of in-situ soil increased more than 3 times, and heated soil emitted a lot of vapors. The soil around electric heater was sintered completely, and its range was almost 20 cm.
Keywords
Ground improvement; Electric heater; Trafficability; Cone penetrometer; Evaporation;
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