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] State Key Laboratory of Intelligent Deep Metal Mining and Equipment, Shaoxing University, Shaoxing, 312000, China; [2] Zhejiang Key Laboratory of Rock Mechanics and Geohazards，School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China; [3] CCTEG Coal Mining Research Institute, Beijing, 100013, China; [4] College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China

年份：2025

卷号：139

外文期刊名：Theoretical and Applied Fracture Mechanics

收录：EI(收录号：20252818774264)、Scopus(收录号：2-s2.0-105010337930)

语种：英文

外文关键词：Bending tests - Crack detection - Elasticity - Fracture - Fracture mechanics - Granite - Loading - Rock mechanics - Sedimentary rocks - Strain measurement

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 three-point 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. ? 2025 Elsevier Ltd