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http://dx.doi.org/10.7843/kgs.2018.34.10.29

Development and Application of Slime Meter for Evaluation of Slime Thickness in Borehole  

Hong, Won-Taek (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Woo, Gyuseong (Daejeon Regional Office of Construction Management, Ministry of Land, Infrastructure and Transport)
Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Song, Myung Jun (R&D Division, Hyundai Engrg. & Construction. Co., Ltd.)
Lim, Daesung (Research Team, Sambo E&C Co., Ltd.)
Park, Min-Chul (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.10, 2018 , pp. 29-38 More about this Journal
Abstract
The slime formed at the bottom of the borehole causes the excessive displacement and loss of the bearing capacity of the drilled shaft. In this study, the slime meter is developed for the evaluation of the slime based on the electrical properties of the fluid and the slime in the borehole. The slime meter is composed of a probe instrumented with electrodes and temperature sensor and a frame with rotary encoder, so that the slime meter profiles the electrical resistivity compensated with temperature effect along the depth. For the application of the slime meter, three field tests are conducted at a borehole with a diameter of 3 m and a depth of 46.9 m with different testing time and locations. For all the tests, the experimental results show that while electrical resistivities are constantly measured in the fluid, the electrical resistivities sharply increase at the surface of the slime. Therefore, the slime thicknesses are estimated by the differences in the depths of the slime surface and the ground excavation. The experimental results obtained at the same testing point with different testing time show that the estimated thickness of the slime increases by the elapsed time. Also, the estimated slime at the side of the borehole is thicker than that at the center of the borehole. As the slime meter estimates the slime in the borehole by measuring the electrical resistivity with simple equipment, the slime meter may be effectively used for the evaluation of the slime formed at the bottom of the borehole.
Keywords
Borehole; Drilled shaft; Electrical resistivity; Ground excavation; Slime;
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