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http://dx.doi.org/10.14481/jkges.2021.22.6.27

The Estimation of Appropriate Mixing Amount of Cement-Bentonite Cutoff Walls for Repair and Reinforcement of Reservoir Embankments  

Kim, Taeyeon (Department of Civil Engineering, Korea National University of Transportation)
Lee, Bongjik (Department of Civil Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean GEO-environmental Society / v.22, no.6, 2021 , pp. 27-32 More about this Journal
Abstract
Due to heavy rainfall and typhoons caused by climate change, it has become common to witness heavy rain that exceeds the design frequency of agricultural reservoirs. This has brought greater attention to the safety of irrigation facilities including agricultural reservoirs. Out of approximately 17,740 reservoirs available in Korea, 83.87% were built before 1970. To ensure the safety of these old reservoirs, their embankments are being repaired and reinforced using various techniques. Among these techniques, using the cement-bentonite cutoff wall makes it possible to construct diaphragm walls with slurry composed of cement and bentonite, while excavation. The advantages of this technique include that it is simple and fast, and ensures the uniformity of cutoff walls by enabling the immediate application of the replacement method to excavation areas; thus excellent performance is guaranteed. However, despite these advantages, the technique is not commonly used in Korea. Thus, this study investigated the changes in strength and permeability by varying the mix ratio of cement and bentonite. As a major experimental results, when the cement of 200 kg/m3 and the bentonite of 60 to 80 kg/m3 is most suitable for the repair and reinforcement of the reservoir embankments.
Keywords
Cement; Bentonite; Mixing amount; Cutoff walls; Uniaxial compressive strength; Permeability;
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