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http://dx.doi.org/10.7474/TUS.2021.31.4.243

Hydraulic Characteristics of Deep and Low Permeable Rock Masses in Gyeongju Area by High Precision Constant Pressure Injection Test  

Bae, SeongHo (GeoGeny Consultants Group Inc.)
Kim, Hagsoo (GeoGeny Consultants Group Inc.)
Kim, Jangsoon (GeoST Consultant Co., Ltd.)
Park, Eui Seob (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Jo, Yeonguk (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Ji, Taegu (Earth EnG)
Won, Kyung-Sik (Geotech Consultant Co., Ltd.)
Publication Information
Tunnel and Underground Space / v.31, no.4, 2021 , pp. 243-269 More about this Journal
Abstract
Since the early 2010s, the social importance of research and practical projects targeting deep geological disposal of high-level nuclear waste, underground CO2 storage and characterization of deep subsurface by borehole investigation has been increasing. In this regard, there is also a significant increase in the need for in situ test technology to obtain quantitative and reliable information on the hydraulic characteristics of deep rock mass. Through years of research and development, we have independently set up Deep borehole Hydraulic Test System (DHTS) based on the key apparatuses designed and made with our own technology. Using this system, high precision constant pressure injection tests were successfully completed at the two 1 km boreholes located in Mesozoic granite and sedimentary rock regions, Gyeongju. During the field tests, it was possible to measure very low flow rate below 0.01 l/min with micro flow rate injection/control module. In this paper, the major characteristics of DHTS are introduced and also some results obtained from the high precision field tests under the deep and low permeable rock mass environment are briefly discussed.
Keywords
Hydraulic characteristics; Constant pressure injection test; Integrated type main frame; Micro flow rate injection; Non steady state flow; Flow dimension;
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