터널과지하공간 (Tunnel and Underground Space)

  • 제5권1호
  • /
  • Pages.70-76
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  • 1995
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
권호 표지

시간 영역 반사법에 의한 암반 변위의 계측 기술 분석

Analysis of the Time Domain Reflectometry for the Monitoring of Rock Displacement

  • 정소걸 (한국자원연구소 채광기술실 실장)
  • 발행 : 1995.03.01
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초록

Two types of deformations can occur on the cable during the monitoring of the rock displacement by the time domain reflectometry. One is the impedance model for tensile deformation, and the other is the capacitance model for the shear deformation. The former gives a response signal with a gradual change in the amplitude of the reflected voltage, meanwhile the latter produces a signal with a blunted spike. The resolution of the TDR can be improved to 0.125% using calibration crimps on the cable of 60 meters long. It is recommended that the diameter of the cable should be 18 mm at least in order to induce a better reflected pulse without any open-circuit. The actual TDR technique cannot characterize the type and the magnitude of rock displacement quantitatively. Systematic investigation of the TDR parameters, such as the exact of cable diameter, cable length, number of crimps, combination of shearing and extension, and environment of the TDR equipment, will be able to improve the resolution to 0.01 mm.

키워드

참고문헌

  1. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. v.25 no.5 Principles of Time Domain Reflectometry Applied to Measurement of Rock Mass Deformation Dowding,C.H.;Su,M.B.;O'Conner,K.M.
  2. Rock Mech. and Rock Engng. v.22 Measurement of rock mass deformation with grouted antenna cables Dowding,C.H.;Su,M.B.;O'Conner,K.M.
  3. Software for Interactive Acquisition and Analysis of Time Domain Reflectometry Measurements Huang Fei Chiu;O'Conner,K.M.;M.Yurchak,D.M.;Dowding,C.H.
  4. Journal of Geotechnical Engineering v.120 no.8 Early Detection of Rock Movement with Time Domain Reflectometry, Paper No. 5680 Dowding,C.H.;Huang Fei Chiu
  5. Mining Science and Technology, vol. 4 A Review of Mining Subsidence Instrumentation and its Potential Application for Seabed Monitoring Forrester,D.J.;Aston,T.R.C.
  6. Surface crown pillar evaluation for active and abandoned metal mines, International Conference Proceedings Monitoring rock mass deformation using time domain reflectometry O'Connor,K.M.;Dowding,C.H.;Su,M.B.
  7. Installation and Monitoring of three abandoned mine crown pillar sites, cobalt, Ontario, MRL, CANMET Charette,F.
  8. Proceedings of Symposium on Time Domain Reflectometry TDR Cables, Inclinometers and Extensometers to monitor coal mine subsicdence in Illinois Kawamura,N.;Bauer,R.A.;Mehnert,B.B.;Van Roosendaal,D.J.
  9. Engng. Des. News Time domain reflectometry-theory and application Moffitt,L.R.
  10. Water Resourc. Res. v.16 no.3 Electromagnetic determination of soil water content; measurements in coaxial transmission lines Topp,G.C.;Davis,J.C.;Annan,A.P.
  11. J. Phys. Chem. v.79 no.14 Evaluation of dielectric behavior by time domain spectroscopy; 1, dielectric response by real time analysis; 2, complex permeability; 3, precision difference methods Cole,R.H.
  12. Proceedings of Symposium on Time Domain Reflectometry Application of TDR for Monitoring the Long Term Behavior of Canadian Abandoned Metal Mines Aston,T.R.C.;B.Tournay,M.C.;Hill,J.D.;Charette,F.
  13. MS thesis, Northwestern Univ. Quantification of rock mass movement with grouted coaxial cable Kim,M.H.