Visual Interpretation about the Underground Information using Borehole Camera

휴대용 시추공 카메라를 이용한 지하정보의 가시화 기법

  • 송정기구남 (일본구슈대학 지구자원) ;
  • 정윤영 (서울대학교 지구환경시스템공학부 BK21사업단)
  • Published : 2005.02.01

Abstract

According to the recent development of measurement system utilizing one or a set of boreholes, visualization of the explored underground became to be a major issue. It induced even the introduction of monitoring apparatuses on the borehole wall with multi-function tool, but the usage of these was often limited by where is unfavorable rock condition and a few of engineers can approach. And so, a portable type of borehole camera with only the essential function has been investigated and a few of commercial models about this is recently being applied into the field condition. This paper was based on the monitoring results obtained using a commercial model by Dr. Nakagawa. Discontinuities in rock mass were the topic for the visualization, and it was studied how can visualize their three dimensional distribution and what a numerical formulation is needed and how to understand the visualization result. The numerical formulation was based on the geometric correlation between the dip direction / dip of discontinuous plane and the trend / plunge of borehole, a set of the equation of a plane was induced. As field application of this into two places, it is found that the above visualization methodology will be especially an useful geotechlical tool for analyzing the local distribution of discontinuities.

Keywords

a portable borehole camera;orientation of discontinuities;orientation of borehole;equation of a plane;components of vector;visualization

References

  1. Brekke T.L. and T.R. Howard, 1972, Stability problems caused by seams and faults, Proc. the I st North American Rapid Excavation and Tunneling Conference, Chicago, USA, Vol. 1, 24-41
  2. Brown S.R. and C.H. Scholz, 1985, Broad bandwidth study of the topography of natural rock surfaces, Journal of Geophysical Research, 90.12, 575-582 https://doi.org/10.1029/JB090iB01p00575
  3. Boas Mary L., 1976, Mathematical Methods in the Physical Sciences 2ed., John Wiley & Sons, New York, p. 95-111
  4. Tiren SA, P. Askling and S. Wonstedt, 1999, Geologic site characterization for deep nuclear waste disposal in fractured rock based on 3D data visualization, Eng. Geol., Vol. 52, 319-346 https://doi.org/10.1016/S0013-7952(99)00014-9
  5. Kulatilake P.H.S.W., T.H. Wu and D.N. Wathugala, 1990, Probabilistic modelling of joint orientation, Int. J. for Numerical and Analytical Methods in Geomechanics, Vol. 14, 325-350 https://doi.org/10.1002/nag.1610140503
  6. Bieniawski Z. T., 1989, Engineering Rock Mass Classifications, John Wiley & Sons, New York, 251 p
  7. Schepers R., G. Rafat, C. Gelbke and B. Lehmann, 2001, Application of borehole logging, core imaging and tomography to geotechnical exploration, Int. J. of Rock Mech. & Min. Sci., Vol. 38, 867-876 https://doi.org/10.1016/S1365-1609(01)00052-1
  8. Pinto V., X. Font, M. Salgot, J.C. Tapias and T. Ma, 2002, Using 3-D structures and their virtual representation as a tool for restoring opencast mines and quarries, Eng. Geol., Vol. 63, 121-129 https://doi.org/10.1016/S0013-7952(01)00076-X
  9. Changming Sun and Stefano Pallottino, 2003, Circular shortest path in images, Pattern Recognition, Vol. 36, 709-719 https://doi.org/10.1016/S0031-3203(02)00085-7
  10. Maerten Laurent, David D. Pollard and Frantz Maerten, 2001, Digital mapping of three-dimensional structures of the Chimney Rock fault system, central Utah, Journal of Structural Geology, Vol. 23, 585-592 https://doi.org/10.1016/S0191-8141(00)00142-5
  11. Billaux D., J.P. Chiles, K. Hestir and J. Long, 1989, Three dimensional statistical modelling of a fractured rock mass - An example from the Fanay - Augeres mine, Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., Vol. 26, 281-299 https://doi.org/10.1016/0148-9062(89)91977-3
  12. Pchrhonen V.G., 1988, Combined geophysical and hydraulic methods for 3D mapping of fractures and siting rock caverns in granite, Eng. Geol., Vol. 25, 45-68 https://doi.org/10.1016/0013-7952(88)90018-X