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| Unequal interval sampling，vector representation and roughness of joint profile
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| CHEN Chong1，2，CHEN Shenghong1 |
| (1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China) |
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Abstract The undulation and roughness of joint plane are important factors affecting mechanical parameters of rock mass. The existing statistical methods of joint profile roughness parameters usually adopt the equal interval sampling method，and there are deviations between the obtained sampling points and the turning points of joint profile fluctuation. In view of the fact that photographing and digital image processing technology are widely used in joint measurement，and pixel is the smallest unit of an image. A unequal interval sampling method based on describing the set of joint plane points is proposed，and then all adjacent sampling points are represented by vector. A new formula for calculating root mean square Z2 of the first derivative of joint profile is also proposed. The conclusions are as follows. (1) The sampling points of the unequal interval sampling method are located at the turning points of the structural surface fluctuation，which are in good agreement with the original contour. (2) Based on the vector representation of the joint profile，the deviations of the joint profile roughness parameters can be calculated quantitatively. (3) The unequal interval sampling and vector representation will make the process of roughness solution more accurate and faster.
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| [1] BARTON N. Review of a new shear strength criterion for rock joints[J]. Engineering Geology，1973，7(4)：287–332.
[2] BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics，1977，10(1)：1–54.
[3] BARTON N，BANDIS S. Review of predictive capabilities of JRC-JCS model in engineering practice[C]// Proceedings of the International Symposium on Rock Joints. Loen，Norway：[s. n.]，1990：603–610.
[4] LEE H S，CHO T F. Hydraulic characteristics of rough fractures in linear flow under normal and shear load[J]. Rock Mechanics and Rock Engineering，2002，35(4)：299–318.
[5] MYERS N O. Characterization of surface roughness[J]. Wear，1962，5(3)：182–189.
[6] MAERZ N H，FRANKLIN J A. Roughness scale effect and fractal dimension[C]// Proceedings of the 1st International Workshop on Scale Effects In Rock Masses. Leon，Amsterdam：[s. n.]，1990：121–125.
[7] LEE Y H，CARR J R，BARR D J，et al. The fractal dimension as a measure of the roughness of rock discontinuity profiles[J]. International Journal of Rock Mechanics and Mining Sciences，1990，27(6)：453–464.
[8] 夏才初，王 伟，丁增志. TJXW–3D 型便携式岩石三维表面形貌仪的研制[J].岩石力学与工程学报，2008，27(7)：1 505–1 512.(XIA Caichu，WANG Wei，DING Zengzhi. Development of three dimensional TJXW–3D typed portable rock surface topography[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 505–1 512.(in Chinese))
[9] 邹先坚，王益腾，王川婴. 钻孔图像中岩石结构面三维形貌特征及优势抗滑方向研究[J].岩土力学，2020，41(增1)：290–298.(ZOU Xianjian，WANG Yiteng，WANG Chuanying. Three-dimensional morphological feature of rock structural surfaces and dominant anti-slip direction using the borehole images[J]. Rock and Soil Mechanics，2020，41(Supp.1)：290–298.(in Chinese))
[10] 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))
[11] BELEM T，HOMAND-ETIENNE F，SOULEY M. Quantitative parameters for rock joint surface roughness[J]. Rock Mechanics and Rock Engineering，2000，33(4)：217–242.
[12] EI-SOUDANI S M. Profilometric analysis of fractures[J]. Metallography，1978，11(3)：247–336.
[13] ZHANG G C，KARAKUS M，TANG H M，et al. A new method estimating the 2D Joint Roughness Coefficient for discontinuity surfaces in rock masses[J]. International Journal of Rock Mechanics and Mining Sciences，2014，72：191–198.
[14] 葛云峰，钟 鹏，唐辉明，等. 基于钻孔图像的岩体结构面几何信息智能测量[J]. 岩土力学，2019，40(11)：4 467–4 476.(GE Yunfeng，ZHONG Peng，TANG Huiming，et al. Intelligent measurement on geometric information of rock discontinuities based on borehole image[J]. Rock and Soil Mechanics，2019，40(11)：4 467–4 476.(in Chinese))
[15] 王思敬. 论岩石的地质本质性及其岩石力学演绎[J]. 岩石力学与工程学报，2009，28(3)：433–450.(WANG Sijing. Geological nature of rock and its deduction for rock mechanics[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(3)：433–450.(in Chinese))
[16] 陈世江，朱万成，王创业，等. 岩体结构面粗糙度系数定量表征研究进展[J]. 力学学报，2017，49(2)：239–256.(CHEN Shijiang，ZHU Wancheng，WANG Chuangye，et al. Review of research progresses of the quantifying joint roughness coefficient[J]. Chinese Journal of Theoretical and Applied Mechanics，2017，49(2)：239–256.(in Chinese))
[17] 周 辉，程广坦，朱 勇，等. 大理岩规则齿形结构面剪切特性试验研究[J]. 岩土力学，2019，40(3)：852–860.(ZHOU Hui，CHENG Guangtan，ZHU Yong，et al. Experimental study of shear deformation characteristics of marble dentate joints[J]. Rock and Soil Mechanics，2019，40(3)：852–860.(in Chinese)) |
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2021, Vol. 40 
