文献类型：期刊文献

英文题名：Crack and failure behaviors of sandstone subjected to dynamic loads visualized by micro-computed tomography

作者：Zhang, Xingyu[1,2,3];Guo, Pengfei[4];Gao, Xiangbo[2];Zou, Chunjiang[5];Wang, Kaiyu[2];Hu, Jinzhu[4];Sun, Yan[4];Lei, Liang[1,2,3]

机构：[1]Westlake Inst Adv Study, Inst Adv Technol, Hangzhou 310024, Peoples R China;[2]Westlake Univ, Sch Engn, Key Lab Coastal Environm & Resources Zhejiang Prov, Hangzhou 310030, Peoples R China;[3]Westlake Univ, Res Ctr Ind Future, Hangzhou 310030, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[5]Brunel Univ, Dept Civil & Environm Engn, London UB8 3PH, England

年份：2025

卷号：17

期号：3

起止页码：1459

外文期刊名：JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001449490700001)、、Scopus(收录号：2-s2.0-86000436056)、WOS

基金：This work is supported by Research Center for Industries of the Future (RCIF) , Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province (No. ZJRMG-2022-03) , and Key Research and Development Program of Guangxi Province (No. Guike AB22080035) , which are gratefully acknowledged. In addition, we are grateful for the valuable and constructive feedback provided by the anonymous reviewers, which has greatly improved this manuscript.

语种：英文

外文关键词：Dynamic rock failure; 3D observation; Microscopic failure mechanism

外文摘要：Microscopic dynamic failure behaviors of rocks are significant to rock engineering, which is still insufficiently understood. This study combines split Hopkinson pressure bar (SHPB) and micro-CT (computed tomography) to explore the microscopic failure characteristics of sandstone under impact loading. SHPB is responsible for the dynamic test, and micro-CT is responsible for pre- and post-test inspections. The results show that the pores and defect influence the dynamic strength but do not alter the overall trend of increased strength with a higher impact level. The dynamical crack development is then analyzed. Three types of cracks (i.e. I-, Y-, and H-type) are identified to describe the crack development. When rock is simply fractured, only I-type crack exists due to tensile failure, and it grows irregularly. As the strain rate increases, I-type crack is transformed into Y- and H-type crack due to shear failure. Crack coalesces at that moment, and the complexity increases along the impact direction. The coalescence occurs preferentially in the area with more pores, and around a third of pores are involved, where the maximum contribution area is in the middle of sample. Microcracks are formed inside the rock blocks, and rock grains and fragments fill in the cracks. The dynamic crack development is accompanied by microcracks, while rock grains and fragments result from the development of these microcracks. In addition, the influence of a semi-penetrating defect perpendicular to the impact direction is investigated. The defect can impede stress transfer and concentrate energy consumption. The findings are expected to enhance understanding of rock dynamics and support rock engineering development. (c) 2025 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).