文献类型：期刊文献

英文题名：Mechanical properties and dynamic multifractal characteristics of shale under anisotropic stress using AE technology

作者：Niu, Yong[1,2,3];Liu, Peng-Fei[1,2];Zhang, Cheng-Peng[4];Hu, Yun-Jin[1];Wang, Jin-Guo[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312099, Zhejiang, Peoples R China;[2]Guangzhou Univ, Protect Struct Ctr, Sch Civil Engn, Guangzhou 510006, Guangdong, Peoples R China;[3]Hohai Univ, Sch Earth Sci & Engn, Nanjing 211100, Jiangsu, Peoples R China;[4]Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China

年份：2023

卷号：226

外文期刊名：GEOENERGY SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001053954800001)、、EI(收录号：20232114134694)、Scopus(收录号：2-s2.0-85159755867)、WOS

基金：The present work is supported by the Shaoxing Basic Public Welfare Planning Project (Grant Nos. 2022A13004) , the National Natural Sci- ence Foundation of China (Grant No. 41977256) , the Zhejiang Natural Science Foundation (Grant No. LHZ21D020001) and the Scientific Research Fund Project of Shaoxing University (Grant No. 2021LG014) .

语种：英文

外文关键词：Shale; Anisotropic stress; Multifractal theory; Early warning; Acoustic emission

外文摘要：The mechanical properties and failure mechanism of shale under anisotropic stress is the key to evaluate the stability of wellbore. Meanwhile, the fracture instability process of shale needs to be characterized by the reasonable monitoring technology. This paper performs a series of uniaxial, biaxial and true triaxial loading tests on shale specimens. A monitoring technology, Acoustic emission (AE), is adopted to record the fracture process of shale. The effects of anisotropic stress on the mechanical behaviors of shale are analyzed. The evolution characteristics of AE event rate are applied to describe the fracture process of shale. The transition from AE quite period to AE active period effectively characterizes the macro-cracking process within shale specimens. The multifractal theory is adopted to analyze the dynamic multifractal characteristics and to quantitatively characterize the fracture instability process of shale. The distribution difference of multifractal parameters can be served as an early warning information for the stable and unstable macro-cracking within shale. The anisotropic stress evidently affects the failure mechanism of shale. The results of this study will be important to ensure the production efficiency of shale gas and the stability of drilling operation.