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| Study on morphological classification method and two-order roughness of rock joints |
| HUANG Man1，HONG Chenjie1，DU Shigui1，LUO Zhanyou2，ZHANG Guozhu3#br# |
| (1. School of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Institute of Geotechnical Engineering，Zhejiang University of Science and Technology，Hangzhou，Zhejiang 310023，China；3. Institute of Geotechnical Engineering，Southeast University，Nanjing，Jiangsu 210096，China) |
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Abstract Three-dimensional morphology of rock joints is the main factor affecting the shear mechanical properties. Aiming at the change of the morphological characteristics of rock joints with different sampling intervals，a morphological classification method based on the limit sampling interval is proposed，the two-order roughness of the macroscopic undulation component and asperities of joint surfaces is obtained，and further the size and interval effects of the two-order roughness of four types of natural joints are studied. The results show that the total roughness of joints is close to the second-order roughness at a small sampling interval while close to the first-order roughness at a large sampling interval，which verifies the feasibility of morphology classification using the sampling interval. The first-order roughness has obvious negative size effect while the size effect of the second-order roughness is not obvious，indicating the size effect of the joint roughness is mainly reflected by the first-order roughness. The analysis of the geometric mechanism of two-order roughness shows that the larger undulation wavelength of the macroscopic undulation component compared to asperities is the key factor that causes the size and interval effects of the two-order roughness. Through the mechanical analysis of the shear model test，it is found that the two-order roughness contributes differently at different shearing stages. The study of the joint shear strength should comprehensively consider the two-order roughness characteristics at different scales.
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2020, Vol. 39 
