DOI QR코드

DOI QR Code

사면의 지표변위 측정을 위한 레이저 거리측정기의 활용

Application of Laser Distance Measurer to measure ground surface displacement in slopes

  • Cho, Yong-Chan (Environmental Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Song, Young-Suk (Geologic Hazards Department, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2014.01.15
  • 심사 : 2014.02.07
  • 발행 : 2014.03.30

초록

본 연구에서는 레이저 거리측정기를 이용하여 사면의 지표변위를 효과적으로 측정하는 방법을 제안하였다. 기존 사면의 지표변위 혹은 지중변위를 측정하기 위한 복잡하고 고가의 장비 대신에 제안된 방법을 적용할 경우 보다 간편하고 쉽게 지표변위를 측정할 수 있다. 레이저 거리측정기는 적색 레이저를 측정을 원하는 피사체에 시준하면 반사되는 레이저를 이용해 거리를 측정하는 기기로 작동방법이 용이하고 측정정밀도도 아주 높으며, 가격이 저렴한 장점이 있다. 제안된 방법의 활용가능성을 검토하기 위하여 실제 지표변위가 지속적으로 발생되는 현장에 적용하였다. 대상지역은 석탄폐석 적치장의 영향으로 하부에 위치하는 절취사면 및 자연사면의 여러 위치에서 지표변위가 발생된 현장이다. 대상지역에 지표변위를 직접적으로 측정하기 위하여 6개의 측정구간과 26개의 측정지점을 선정하였다. 일정한 기간 동안 제안된 방법을 이용하여 측정한 결과 누적 지표변위량 뿐만 아니라 지표변위속도까지 측정이 가능하였다. 그리고 이들 결과를 종합적으로 분석하여 지표변위 발생방향을 확인 및 예측할 수 있다.

In this study, the method to measure effectively the ground surface displacement of slope was proposed using the Laser Distance Measurer (LDM). Applying the proposed technique is more simple and easier than the complicated and high-priced instrument to measure the ground surface displacement. LDM is an instrument that the red laser aimed at the target and then the reflected laser used for calculating the distance. The advantages of LDM are easy operating method, high measurement precision and lower in price. To check the feasibility, the proposed method applied to the real site that the ground surface displacement of slope was occurred continuously. The ground surface displacements were occurred in various points of the natural and cut slopes located at the lower part of coal mine waste heap due to the load of waste heap. To measure directly the ground surface displacement in this site, 6 measurement sections and 26 measurement points were selected. As the result of the displacement measured by the proposed technique within a certain period time, the accumulative ground surface displacement could be measured as well as the velocity of displacement could be estimated. Also, the progress direction of ground surface displacement can be confirmed and predicted through the analysis of all measured result.

키워드

참고문헌

  1. Chigira, M., Duan, F., Yagi, H. and Furuya, T. (2004) "Using an airborne laser scanner for the identification of shallow landslides and susceptibility assessment in an area of ignimbrite overlain by permeable pyroclastics", Landslides, Vol.1, pp. 203-209. https://doi.org/10.1007/s10346-004-0029-x
  2. Cho, Y.C. and Song, Y.S. (2013) "Deformation characteristics of a slope at a coal waste depot through analysis of monitoring results", Journal of Engineering Geology, Vol.23, No.1, pp.19-27. (in Korean) https://doi.org/10.9720/kseg.2013.1.19
  3. Fanti, R., Gigli, G., Lombardi, L., Tapete, D and Canuti, P. (2013) "Terrestrial laser scanning for rockfall stability analysis in the cultural heritage site of Pitigliano (Italy)", Landslides, Vol.10, pp.409-420. https://doi.org/10.1007/s10346-012-0329-5
  4. Han, J.G. and Song, Y.S. (2003) "Displacement measuring system for the slope stability analysis using the softcopy photogrammetry", Journal of the Korean Geotechnical Society, Vol.19, No.4, pp.23-32. (in Korean)
  5. Han, J.G., Bae, S.H. and Oh, D.Y. (2001) "Application of photogrammetry method to measure ground-surface displacement on the slope", Journal of Korean Env. Res. and Reveg. Tech., Vol.4, No.3, pp.10-18. (in Korean)
  6. Hong, W.P., Han, J.G. and Lee, M.G. (1995) "The behavior of a cut slope stabilized by use of piles", Journal of the Korean Geotechnical Society, Vol.11, No.4, pp.111-124. (in Korean)
  7. Jeong, S.S., Won, J.O., Park, J.B. and Kim, S.Y. (2001) "Simplified design method for stabilizing piles and its application", Journal of the Korean Geotechnical Society, Vol.17, No.6, pp.5-14. (in Korean)
  8. Kim, G.L. and Kim, M.B. (1999) "The development of deformation system for structure using laser beam", Journal of Korean Society of Civil Engineers, Vol.19, No.III-4, pp.669-676. (in Korean)
  9. Kwak, H.G. and Ha, S.J. (2008) "Determination of plastic settlement of mortar using non-contact laser measurement device", Journal of Korean Society of Civil Engineers, Vol.28, No.4A, pp.549-564. (in Korean)
  10. Lee, H.Y., Cho, S.J., Sung, N.H., and Kim, J.H. (2007) "Development a GB-SAR (I): System configuration and interferometry", Korean Journal of Remote Sensing, Vol.23, No.4, pp.237-245. (in Korean) https://doi.org/10.7780/kjrs.2007.23.4.237
  11. Lee, S.H., Shin, M.H. and Kim, H.K. (2009) "Safety monitoring of railway tunnel using laser beam convergence meter", Proc. 2009 KSCE annual conference, pp.3720-3723. (in Korean)
  12. Leva, D., Nico, G., Tarchi, D., Fortuny-Guasch, J., and Sieber, A.J. (2003) "Temporal analysis of a landslide by means of a ground-based SAR interferometer", IEEE Transactions on Geoscience and Remote Sensing, Vol.41, No.4, pp.745-757. https://doi.org/10.1109/TGRS.2003.808902
  13. Oh, S.C., Park, H.D. and Jo, Y.D. (2012) "Analysis of rock discontinuities using terrestrial laser scanning", Journal of the Korean Society for Geosystem Engineering, Vol.49, No.1, pp.37-46. (in Korean)
  14. Song, Y.S., Hong, W.P. and Woo, K.S. (2012) "Behavior and analysis of stabilizing piles installed in a cut slope during heavy rainfall", Engineering Geology, Vol.129-130, pp.56-67. https://doi.org/10.1016/j.enggeo.2012.01.012
  15. Tarchi, D., Casagli, N., Fanti, R., Leva, D., Luzi, G., Pasuto, A., Pieraccini, M., and Silvano, S. (2003) "Landslide monitoring by using ground-based SAR interferometry: an example of application to the Tessina landslide in Italy", Engineering Geology, Vol.68, pp.15-30. https://doi.org/10.1016/S0013-7952(02)00196-5