文献类型：期刊文献

英文题名：Influences of water saturation and strain rate on the mechanical and failure behavior of sandstone under direct shear test with constant normal pressure

作者：Zhou, Tao[1];Yin, Xuehan[1,2];Zhou, Changtai[1,3];Guo, Pengfei[4];Zhou, Jian[5]

机构：[1]Shenzhen Univ, Inst Deep Earth Sci & Green Energy, Coll Civil & Transportat Engn, Guangdong Prov Key Lab Deep Earth Sci & Geothermal, Shenzhen, Peoples R China;[2]Univ Alberta, Dept Civil Environm Engn, Edmonton, AB, Canada;[3]City Univ Hong Kong, Dept Architecture & Civil Engn, Hong Kong, Peoples R China;[4]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[5]Cent South Univ, Sch Resources & Safety Engn, Changsha, Peoples R China

年份：2024

卷号：175

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

收录：SCI-EXPANDED(收录号：WOS:001200012100001)、、EI(收录号：20241015671833)、Scopus(收录号：2-s2.0-85186496197)、WOS

基金：This work was financially supported by the National Key R & D Program of China (2022YFC3004602), the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (2019ZT08G315) , the National Natural Science Foundation of China (52274090; 42177164) , Shenzhen Fundamental Research Program (JCYJ20210324093400001, KQTD20221101093555006) and Guangdong Basic and Applied Basic Research Foundation (2022A1515010827) .

语种：英文

外文关键词：Direct shear test; Water saturation; Strain rate; AE behavior; Fracture behavior; Failure mechanism

外文摘要：Understanding the mechanical and failure behavior of rock subjected to dynamic shear load is essential for the scientific design and safe operation of rock engineering. To understand the coupled effect of water and strain rate on the mechanical and failure behavior of sandstone, direct shear tests with constant normal pressure were conducted on sandstone specimens under different water saturations with shear strain rate ranging from 10-5 s-1 to 10-2 s- 1. The acoustic emission (AE) and scanning electron microscope (SEM) techniques were applied to analyze shear behavior and reveal failure mechanism under different loading conditions. Results show that at a given strain rate shear strength decreases with increasing water saturation, while it increases with strain rate when the water saturation remains constant. Meanwhile, the water-saturated specimens are more sensitive to strain rate effect than dry specimens, which is mainly the result of the Stefan effect. Both water and strain rate affect AE activity and fracturing of the specimens during shearing process. AE activity was more intense and lasted longer at low water saturation condition. With increasing strain rate, the peak AE counts decreased, yet the peak cumulative energy of AE events increased. The SEM analysis reveals that the development of microcracks is fuller under the conditions of low water saturations and high strain rates. The microcrack network and fracture surfaces are more complicated at lower water saturation, while microcracks are wider and the fracture surfaces are smoother under higher strain rate shearing. The findings of this study contribute to a better understanding of mechanical and failure behavior of sandstone material under the coupled effect of water saturation and dynamic disturbance.