文献类型：期刊文献

英文题名：Influence of roughness and slip velocity on the evolution of frictional strength

作者：Gan, Quan[1,2];Zhang, Xinyuan[1,2];Li, Qiang[1,2];Chen, Jianye[3];Zhang, Fengshou[4];Zhong, Zhen[5];Jia, Yunzhong[1,2];Yu, Pengliang[6];An, Mengke[7];Elsworth, Derek[6]

机构：[1]Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing, Peoples R China;[2]Chongqing Univ, Sch Resources & Safety Engn, Chongqing, Peoples R China;[3]China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;[4]Tongji Univ, Dept Geotech Engn, Shanghai, Peoples R China;[5]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[6]Penn State Univ, Dept Geosci, University Pk, PA 16802 USA;[7]Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

年份：2025

卷号：188

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

收录：SCI-EXPANDED(收录号：WOS:001441663500001)、、EI(收录号：20250917950354)、Scopus(收录号：2-s2.0-85218466630)、WOS

语种：英文

外文关键词：Sandstone fractures; Frictional healing; Frictional strength; Slide-hold-slide experiments

外文摘要：Surface roughness and slip velocity play a critical role in determining the strength of crustal faults and their potential seismic response. We examine these controls through slide-hold-slide (SHS) experiments on bare sandstone fractures of variable roughnesses and slip velocities. These experiments explore the effects of frictional healing and frictional relaxation quantified through rate-and state-dependent friction law (RSF). Frictional healing rates ((t) range between 0.0020 and 0.0074 and frictional relaxation rates ((tc) between 0.0058 and 0.0097. Increases in surface roughness and shear velocity each accelerate healing and relaxation, whereas elevated normal stresses promote accelerated healing but suppress relaxation. Fracture contact area is closely correlated with changes in frictional healing rate with the evolution of protrusion playing a key role in this frictional response. The number of time-binned AE ring-down counts increase with increasing strength as observed during reactivation - and therefore serve as a reliable indicator of increased strength gain. The logarithmic relationship between hold-time and evolution in the contact area is confirmed by correlations with seismic moment independently measured from the absolutely calibrated AE data. This correlates with an observed increased RSF-b evocative of elevated frictional recovery during hold that translates to a more rapid and intense energy release.