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  2017, Vol. 36 Issue (5): 1101-1110    DOI: 10.13722/j.cnki.jrme.2016.0951
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A new method for evaluating the roughness of three-dimensional discontinuity surface of rock
CAI Yi,TANG Huiming,GE Yunfeng,ZHANG Shen,TAN Qinwen
(Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China)
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Abstract  The reason of taking the potential contact area of rock mass discontinuity(RMD) as the important factor of surface roughness evaluation was explained theoretically in order to obtain the evaluation index with a clear geometric meaning.   was put forward as a new evaluation index,which was associated with the mechanical properties. Two projection areas of the RMD surface were calculated,one was the projection of potential contact area on the plane which was perpendicular to the shear direction,the other was the projection of the whole RMD surface on the horizontal plane.   is the area ratio of the former to the latter. The three-dimensional(3D) geometry information of the RMD in the shear direction was embodied by  ,which was an anisotropic index. Based on the 3D laser scanning technology and Matlab programming,the 3D geometric model of the RMD was built and  was calculated. The computational process and anisotropy of   were presented via the engineering examples. A series of   of the RMD models built with different elaborate degrees were studied,and the results showed that   increased with the increasing of the elaborate degrees of models. The comparison between the results from Grasselli?s evaluation method and   method showed that these two methods are similar. Furthermore,a good relationship was established between   and the shear strength of the RMD,which laid the foundation for further study on the shear strength evaluation model of the RMD.
Key wordsrock mechanics      rock mass discontinuity      shear failure mechanism      three-dimensional surface roughness      three-dimensional laser scanning technique     
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CAI Yi
TANG Huiming
GE Yunfeng
ZHANG Shen
TAN Qinwen
Cite this article:   
CAI Yi,TANG Huiming,GE Yunfeng, et al. A new method for evaluating the roughness of three-dimensional discontinuity surface of rock[J]. , 2017, 36(5): 1101-1110.
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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.0951      OR      http://www.rockmech.org/EN/Y2017/V36/I5/1101
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