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.
蔡 毅，唐辉明，葛云峰，张 申，谭钦文. 岩体结构面三维粗糙度评价的新方法[J]. 岩石力学与工程学报, 2017, 36(5): 1101-1110.
CAI Yi，TANG Huiming，GE Yunfeng，ZHANG Shen，TAN Qinwen. A new method for evaluating the roughness of three-dimensional discontinuity surface of rock. , 2017, 36(5): 1101-1110.
[1] HUDSON J A，HARRISON J P. Engineering rock mechanics： an introduction to the principles[M]. [S. l.]：Elsevier，2000：113–139.
[2] BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics，1977，10(1)：1–54.
[3] DEVELI K，BABADAGLI T，COMLEKCI C. A new computer- controlled surface-scanning device for measurement of fracture surface roughness[J]. Computers and Geosciences，2001，27(3)：265–277.
[4] BAE D S，KIM K S，KOH Y K，et al. Characterization of joint roughness in granite by applying the scan circle technique to images from a borehole televiewer[J]. Rock Mechanics and Rock Engineering，2011，44(4)：497–504.
[5] FARDIN N，STEPHANSSON O，JING L. The scale dependence of rock joint surface roughness[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(5)：659–669.
[6] MLYNARCZUK M. Description and classification of rock surface by means of laser profilometry and mathematical morphology[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(1)：138–149.
[7] BARTON N. Review of a new shear-strength criterion for rock joints[J]. Engineering Geology，1973，7(4)：287–332.
[8] BARTON N. The shear strength of rock and rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1976，13(9)：255–279.
[9] WU T H，ALI E M. Statistical representation of joint roughness[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1978，15(5)：259–262.
[10] GRASSELLI G. Shear strength of rock joints based on quantified surface description[Ph. D. Thesis][D]. Lausanne：Swiss Federal Institute of Technology，2001.
[11] GRASSELLI G，WIRTH J，EGGER P. Quantitative three-dimensional description of a rough surface and parameter evolution with shearing[J]. International Journal of Rock Mechanics and Mining Science，2002，39(6)：789–800.
[12] TATONE B S A，GRASSELLI G. A method to evaluate the three-dimensional roughness of fracture surfaces in brittle geomaterials[J]. Review of Scientific Instruments，2009，80(12)：125110–125110–10.
[13] KULATILAKE P H S W，SHOU G，HUNAG T H，et al. New peak shear strength criteria for anisotropic rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(7)：673–697.
[14] KULATILAKE P H S W，BALASINGAM P，PARK J，et al. Natural rock joint roughness quantification through fractal techniques[J]. Geotechnical and Geological Engineering，2006，24(5)：1 181– 1 202.
[15] BABANOURI N，NASAB S K，SARAFRAZI S. A hybrid particle swarm optimization and multi-layer perceptron algorithm for bivariate fractal analysis of rock fractures roughness[J]. International Journal of Rock Mechanics and Mining Sciences，2013，60：66–74.
[16] JAEGER J C. Friction of rocks and stability of rock slopes[J]. Geotechnique，1971，21(2)：97–134.
[17] 刘佑荣，唐辉明. 岩体力学[M]. 北京：化学工业出版社，2008：76–77.(LIU Yourong，TANG Huiming. Rock mass mechanics[M]. Beijing：Chemical Industrial Press，2008：76–77.(in Chinese))
[18] 葛云峰. 基于BAP的岩体结构面粗糙度与峰值抗剪强度研究[博士学位论文][D]. 武汉：中国地质大学(武汉)，2014.(GE Yunfeng. Research on roughness and peak shear strength for rock discontinuities based on BAP[Ph. D. Thesis][D]. Wuhan：China University of Geosciences(Wuhan)，2014.(in Chinese))
[19] PARK J W，SONG J J. Numerical method for the determination of contact areas of a rock joint under normal and shear loads[J]. International Journal of Rock Mechanics and Mining Sciences，2013，58：8–22.
[20] PATTON F D. Multiple modes of shear failure in rock[C]// Proceeding of the 1st ISRM Congress，International Society for Rock Mechanics. [S. l.]：[s. n.]，1966：509–513.
[21] TANG H M，GE Y F，WANG L Q，et al. Study on estimation method of rock mass discontinuity shear strength based on three-dimensional laser scanning and image technique[J]. Journal of Earth Science，2012，23(6)：908–913.
[22] 马俊伟，唐辉明，胡新丽，等. 三维激光扫描技术在滑坡物理模型试验中的应用[J]. 岩土力学，2014，35(5)：1 495–1 505.(MA Junwei，TANG Huiming，HU Xinli，et al. Application of 3D laser scanning technology to landslide physical model test[J]. Rock and Soil Mechanics，2014，35(5)：1 495–1 505.(in Chinese))
[23] 葛云峰，唐辉明，王亮清，等. 天然岩体结构面粗糙度各向异性，尺寸效应，间距效应研究[J]. 岩土工程学报，2016，38(1)：170–179.(GE Yunfeng，TANG Huiming，WANG Liangqing，et al. Anisotropy，scale and interval effects of natural rock discontinuity surface roughness[J]. Chinese Journal of Geotechnical Engineering，2016，38(1)：170–179.(in Chinese))
2017, Vol. 36 
