文献类型：期刊文献

英文题名：Effect of the crystal habit on micromechanical extensile behaviors of the crystalline rock during compression

作者：Huang, Xiaolin[1,2];Qi, Shengwen[1,2];Guo, Songfeng[2];Zheng, Bowen[2];Zhao, Qi[3];Sha, Peng[4];Wang, Tianzuo[4];Yao, Xianglong[5];Liang, Ning[2];Chang, Jinyuan[4];Rong, Xiaoyang[6]

机构：[1]Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Dept Civil Engn, Xianning West Rd 28, Xian 710049, Shaanxi, Peoples R China;[2]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China;[3]Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China;[5]China Three Gorges Corp, Inst Sci & Technol, Beijing 101100, Peoples R China;[6]Dalian Ocean Univ, Coll Ocean & Civil Engn, Dalian 116024, Peoples R China

年份：2022

卷号：310

外文期刊名：ENGINEERING GEOLOGY

收录：SCI-EXPANDED(收录号：WOS:000874810900001)、、EI(收录号：20224212973499)、Scopus(收录号：2-s2.0-85139858223)、WOS

基金：This work was funded by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) under Grant No. 2019QZKK0904; the National Key Research and Development Plan of China under Grant No. 2019YFC1509701; the Key Research Program of the Institute of Geology & Geophysics, CAS under Grant No. IGGCAS-201903402; National Natural Science Foundation of China under Grants Nos. 41825018, 41941018, 41902289, and 41888101; Culture of Seeding Project of Young Scientific and Technological Talents Founded by Department of Education of Liaoning Province under Grant QL 202012; Zhejiang Provincial Natural Science Foundation of China under Grant No. LQ18D020001. We would like to appreciate Dr. Lihui Li and Dr. Yusheng Zhu for providing the polarized thin sections. Data used in this paper are available from doi:10.17632/jhr6xystvr.3.

语种：英文

外文关键词：Crystalline rock; Crystal habit; Microstructure; Heterogeneity; Micromechanical extensile behavior; Microcracking

外文摘要：The crystal habit controls the microstructure heterogeneity of the crystalline rock and significantly affects its mechanical behaviors. However, thus far, this effect has not been quantitatively characterized. Here we established a grain-based model to investigate effects of the crystal habit on compression-induced micromechanical extensile behaviors of the crystalline rock. Alteration of the grain morphology heterogeneity from the euhedral to anhedral was quantitatively depicted by the fractal dimension. Meanwhile, heterogeneity of grain-scale mechanical properties was also considered, which depended on the stress state. We identified two effects related to the crystal habit that affected mechanical behaviors of the crystalline rock: the tensile stress concentration effect (TSCE) and the grain boundary interlocking effect (ILE). These two effects counteracted with each other with modulating the crystal habit. The stress threshold of the crack initiation of the crystalline rock generally decreased as the crystal habit modulated from the euhedral to anhedral, while the stress thresholds of the crack damage and the peak stress first decreased and then increased. The crystal habit had important influences on the stress distributions and further affected the progressive failure characteristics of the crystalline rock. The intergranular cracking was throughout the whole process while the transgranular failure mainly emerged adjacent to the crack damage stage. With modulating the crystal habit from the euhedral to anhedral, the number of the transgranular failure zone first decreased then increased. We acquired new insights into the microcracking behaviors of the crystalline rock in which the transition to the anhedral microstructure could favor the transgranular failure.