文献类型：期刊文献

英文题名：Experimental evidence for the critical wavelet transform level in multi-scale roughness decomposition of rock joints

作者：Yong, Rui[1,2];Zhong, Zhen[2,6];Li, Yingchun[3];Du, Shigui[1,2];Wang, Changshuo[1];Huang, Lei[4,5]

机构：[1]Ningbo Univ, Inst Rock Mech, Sch Civil & Environm Engn, Ningbo 315211, Zhejiang, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China;[3]Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian, Peoples R China;[4]China Univ Geosci, Badong Natl Observat & Res Stn Geohazards, Wuhan 430074, Hubei, Peoples R China;[5]China Univ Geosci, Three Gorges Res Ctr Geohazards, Minist Educ, Wuhan 430074, Hubei, Peoples R China;[6]China Univ Min & Technol Beijing, State Key Lab Tunnel Engn, Beijing, Peoples R China

年份：2024

卷号：175

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：SCI-EXPANDED(收录号：WOS:001182288800001)、、EI(收录号：20240715538727)、Scopus(收录号：2-s2.0-85184515791)、WOS

基金：Funding The study was funded by the National Natural Science Foundation of China (No. 42177117 and No. 52179097) , and the Zhejiang Collabo- rative Innovation Center for Prevention and Control of Mountain Geological Hazards (No. PCMGH-2017-Z03) .

语种：英文

外文关键词：Joint roughness; Multi-order; Shear strength; Direct shear test; Wavelet transform level

外文摘要：Shear behaviour of rock joints is highly affected by multi-order roughness and the mechanical involvements of each-order roughness in shear are different. Quantitative decomposition of total roughness into waviness (firstorder) and unevenness (second- order) can be achieved by the well-accepted wavelet analysis; the decomposition quality depends heavily on the critical wavelet transform level (cWTL) at which the unevenness component is completely excluded from the total roughness while the waviness remains unimpaired. However, determination of the cWTL has been either empirical or based on pure statistical analysis of the joint morphology without a solid mechanical foundation. Here, we experimentally determined the cWTL by conducting direct shear tests on joint specimens profiled of serial WTLs with the aid of 3D printing and 3D scanning techniques. Through the joint analysis of mechanical data and quantified morphological variation, we found that the peak shear strength, shear strength component partition and shear-induced damage all experienced noticeable transition from WTL at 5 to 6 under a wide range of normal stress regimes, evidencing that the cWTL is 6, consistent with the one acquired from statistical analysis. Our conclusion provides a guiding value of the cWTL for investigating the roles of multiscale roughness in rock joint shear.