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Volume 38 Issue 1
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GE Yun-feng, TANG Hui-ming, WANG Liang-qing, ZHAO Bin-bin, WU Yi-ping, XIONG Cheng-ren. Anisotropy, scale and interval effects of natural rock discontinuity surface roughness[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(1): 170-179. DOI: 10.11779/CJGE201601019
Citation: GE Yun-feng, TANG Hui-ming, WANG Liang-qing, ZHAO Bin-bin, WU Yi-ping, XIONG Cheng-ren. Anisotropy, scale and interval effects of natural rock discontinuity surface roughness[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(1): 170-179. DOI: 10.11779/CJGE201601019
shu

Anisotropy, scale and interval effects of natural rock discontinuity surface roughness

  • 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
    2. China Electric Power Research Institute, Beijing 100055, China;
    3. Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, China

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  • Received Date: March 12, 2015
  • Published Date: January 19, 2016
    Graphical Abstract
    • Abstract
  • To estimate the influence factors on the natural rock discontinuity roughness, taking an in-situ large scale rock collected in Wulong County, Chongqing City as an example, the variation rules of roughness under different sampling directions, sizes and precisions are analyzed by using the 3D laser scanning technology, and Grasselli’s method is improved through discretization of rock discontinuity into a large amount of quadrangular tiny planes rather than triangular planes. The results show that the natural rock discontinuities considered herein are characterized by obvious anisotropies, positive scale effects and interval effects. Therefore, the sampling direction with respect to roughness data acquisition should be kept the same with the shearing direction (direction of rock mass movement) in the procedure of roughness evaluation. In addition, the sampling size is specified to be equal to or larger than the effective sampling size, while the sampling interval should be equal to or less than the effective sampling interval. For the convenient comparison among the assessed results by different methods, this kind of study should be performed under the same sampling parameters including sampling directions, sizes and intervals.
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    • References (30)
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