文献类型：期刊文献

英文题名：Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

作者：Zong, Yijiang Han, Lijun Jin, Yuhao Zhao, Weisheng Meng, Lingdong

第一作者：Zong, Yijiang

通信作者：Zong, YJ[1];Zong, YJ[2];Zong, YJ[3]

机构：[1]Jiangsu Vocat Inst Architectural Technol, Sch Transportat Engn, Xuzhou 221116, Jiangsu, Peoples R China;[2]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;[3]Univ Nottingham, Fac Engn, Nottingham NG7 2RD, England;[4]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Peoples R China

第一机构：Jiangsu Vocat Inst Architectural Technol, Sch Transportat Engn, Xuzhou 221116, Jiangsu, Peoples R China

通信机构：corresponding author), Jiangsu Vocat Inst Architectural Technol, Sch Transportat Engn, Xuzhou 221116, Jiangsu, Peoples R China;corresponding author), China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;corresponding author), Univ Nottingham, Fac Engn, Nottingham NG7 2RD, England.

年份：2020

卷号：13

期号：3

外文期刊名：ENERGIES

收录：;EI(收录号：20200708149841);Scopus(收录号：2-s2.0-85079093588);WOS:【SCI-EXPANDED(收录号:WOS:000522489000091)】；

基金：This research was funded by the National Natural Science Foundation of China (Grant No. 51574223), the Natural Science Foundation of Jiangsu Province (Grant No. BK20160208), the University Nature Science Research Projects of Jiangsu Province (Grant No.17KJB440003), the Science and Technology Foundation of Guizhou Province (Grant No.[2018]1061), the Youth Science and Technology Talents Development Project of Guizhou Province (Grant No. KY[2017]219), the Jiangsu University Overseas Research Program and Qing Lan Project.

语种：英文

外文关键词：fractured sandstone; damage; creep behavior; long-term strength; failure modes

摘要：Short-term and creep tests of fractured sandstone with different degrees of damage prepared using pre-peak and post-peak unloading tests on intact sandstone were carried out using a servo-controlled rock mechanics system. Based on our experimental results, the influence of confining pressure and damage on short-term mechanical behavior of fractured sandstone with different degrees of damage was first analyzed. The results show that the peak strength, residual strength, elastic modulus, and secant modulus of fractured sandstone increase linearly with increasing confining pressure, but decrease with increasing damage. The short-term failure modes depend on the damage and change from typical shear failure modes to multiple shear failure modes with increasing damage. Then, the influence of the differential stress, confining pressure, and the degree of damage on the creep mechanical behavior of fractured specimens was further investigated. The axial instantaneous strain and creep strain increase linearly with increasing differential stress, and the specimens exhibit significant time-dependent behavior under high stress. The steady creep rate increases with increasing stress, but it decreases with increasing confining pressure and damage. However, the long-term strength and creep failure strength of fractured specimens increase linearly with increasing confining pressure, but they decrease linearly with increasing damage. The creep failure modes of fractured specimens are also the main shear failure modes, which are similar to the short-term failure modes.