文献类型：期刊文献

英文题名：Experimental investigation of lithology-dependent response to loading rate in rock fracture: From microcracking mechanisms to macroscopic fracture characteristics

作者：Xue, Fei[1,2];Zhou, Xin[1,2];Wang, Xiaoqing[3];Wu, Jianxing[3];Lin, Zhongqin[4];Zhou, Shishi[1,2]

机构：[1]Shaoxing Univ, State Key Lab Intelligent Deep Met Min & Equipment, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Zhejiang Key Lab Rock Mech & Geohazards, Shaoxing 312000, Peoples R China;[3]CCTEG Coal Min Res Inst, Beijing 100013, Peoples R China;[4]Fuzhou Univ, Coll Civil Engn, Fuzhou 350108, Peoples R China

年份：2025

卷号：139

外文期刊名：THEORETICAL AND APPLIED FRACTURE MECHANICS

收录：SCI-EXPANDED(收录号：WOS:001534229000001)、、EI(收录号：20252818774264)、Scopus(收录号：2-s2.0-105010337930)、WOS

基金：The authors would like to acknowledge the financial support for this study provided by the National Natural Science Foundation of China (52104094, 52274124) and the China Postdoctoral Science Foundation (2022M721997) .

语种：英文

外文关键词：Loading rate; Rock fracture mechanics; Lithology dependence; Fracture process zone; Acoustic emission monitoring; Surface morphology

外文摘要：The fracture characteristics of rock materials are significantly influenced by lithology and loading rate. This study examines the loading rate-dependence of fracture behavior in granite, marble, and sandstone using threepoint bending tests conducted at rates ranging from 0.0002 mm/s to 0.002 mm/s. Real-time acoustic emission (AE) detection was integrated with digital image correlation (DIC) to capture full-field strains and track crack initiation and propagation during loading. Results indicate that fracture toughness increases markedly with loading rate, with granite showing the highest sensitivity (20.2 % increase), followed by marble (17.1 %) and sandstone (12.8 %). Analysis of fracture surfaces reveals a systematic decrease in the Joint Roughness Coefficient with increasing loading rate. AE and DIC analyses demonstrate that lower loading rates favor intergranular fracturing dominated by tensile cracks, while higher loading rates promote transgranular fracturing, especially in crystalline rocks, leading to higher-energy acoustic events and longer but narrower fracture process zones (FPZs). Lithology significantly affects both absolute fracture properties and sensitivity to loading rate effects, with crystalline rocks exhibiting greater rate dependency than sedimentary rocks. These findings offer valuable insights for understanding loading rate effects in rock engineering applications.