TXT-tool 4.081-9.1: Rotary Sampling Drilling Technology to Extract High-Quality Cores Using a Sleeve-Incorporating Core Barrel and Polymer Mud in Landslide Areas of Japan and Vietnam
In many cases, cores that are extracted from landslide areas contain loose, moving land blocks and crushed rock that differ from their in situ state because of disturbance at the time of drilling. Therefore, it is difficult to obtain much of the information required for analysis of landslide mechanisms. In recent years, a rotary drilling technology in which a core barrel incorporating a plastic film and diamond bit has been used in Japanese landslide areas, along with polymer mud as the drilling fluid. This drilling technology is effective in maintaining the core hole wall in soft layers, such as gravel mixed with soil, and has made it possible to eliminate cutting in many cases. As a result, it has become possible to extract high-quality cores from depths of 200 m or more in landslide areas and to obtain the information needed to analyze landslide mechanisms, such as the slide surface and the record of landslide movements and activity, as well as the geological features, during the initial stage of investigation. We studied the feasibility of this drilling method, which is highly dependent on the experience and judgment of veteran drilling engineers, the adaptability of the method to landslide areas other than those in Japan, and the economic efficiency of the method in comparison to the conventional drilling method.
KeywordsLandslide research drilling Drilling method High-quality drilling core Core barrel Polymer mud
Data from the Hai Van landslide in Vietnam obtained in the Japanese and Vietnamese joint JICA/JST/ITST research project “Development of landslide risk assessment technology along transport arteries in Viet Nam” was used in this study. I would like to express my appreciation to those who collected the data and made it available for use. I am also grateful for information and advice concerning polymer mud received from Mr. Kazuhiro Kodama of the Telnite Co., Ltd. and for information and advice concerning the sleeve-incorporating core barrel received from Mr. Hiroshi Tanaka of the K. Maikai Co., Ltd.
- Chilingarian GV, Vorabutr P (1983) Drilling and drilling fluids. Developments in petroleum science II. Elsevier, Amsterdam, p 801Google Scholar
- Eugene S, Warren ET (1989) Application of drilling, coring, and sampling techniques to test holes and wells. Techniques of water-resource investigations of the United States Geological Survey, United States Government Printing Office, Washington, p 97Google Scholar
- Igarashi N, Sakurai M, Takeuchi A, Kuroki K (2013) Example cases of field experiments of boreholes for ground survey. In: Japan geotechnical consultants association, proceedings of the geotechnology forum 2013, Nagano, JapanGoogle Scholar
- Okino B (1981) Drilling fluids. Gihodo Shuppan, Chiyoda-ku, p 398Google Scholar
- Okino B (1989) Manual of drilling fluid technology. Telnite Co. Ltd, Shibuya-kuGoogle Scholar
- Takeda S, Komiya K (2005) From air bubble boring: the hybrid method to a core sampling of high-quality, Tsuchi-to-kiso. Jpn Geotech Soc 54–4(579):16–18Google Scholar
- Tani K, Kaneko S, Oshida Y, Ikemi M (2004) Development of instrumented drilling technology for geotechnical investigation of rock mass. In: Proceedings of the 3rd Asian Rock mechanics symposium, Kyoto, pp 1181–1186Google Scholar
- Tomioka Y, Kondo H, Goto K, Goto K, Yoshimura K, Muramoto S (2013) Evaluation of chemical properties of groundwater affected by fluids and cementing used in a borehole drilling. Civil Engineering Research Laboratory, Rep. No. N12012, Central Research Institute of Electric Power Industry, p 34Google Scholar