文献类型：期刊文献

英文题名：Fracture evolution characteristics of strainburst under different gradient stress

作者：Wang, Gang[1,3,4];Liu, Xiqi[2,6];Song, Leibo[3,4];Bao, Chunyan[3,4];Wang, Zhenhua[5];Chen, Hao[3,4]

机构：[1]Wuhan Univ, Sch Civil Engn, Key Lab Geotech & Struct Engn Safety Hubei Prov, Wuhan, Hubei, Peoples R China;[2]Pearl River Water Resources Res Inst, Guangzhou, Guangdong, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing, Zhejiang, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Zhejiang, Peoples R China;[5]East China Univ Technol, Sch Civil & Architecture Engn, Nanchang, Jiangxi, Peoples R China;[6]Pearl River Water Resources Res Inst, Guangzhou 510611, Guangdong, Peoples R China

年份：2023

外文期刊名：INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS

收录：SCI-EXPANDED(收录号：WOS:001068184000001)、、EI(收录号：20233814749176)、Scopus(收录号：2-s2.0-85171480058)、WOS

基金：National Natural Science Foundation of China, Grant/Award Number: 42002275; National Natural Science Foundation of Zhejiang province, Grant/Award Number: LQ21D020001; China Postdoctoral Science Foundation, Grant/Award Number: 2023M732689; Shaoxing Science and Technology Plan Project, Grant/Award Number: 2022A13003

语种：英文

外文关键词：civil engineering; fracture mechanism; rockburst intensity; rockburst laboratory test; stress gradient

外文摘要：Strainburst often occurs in the loading process of tangential stress concentration from surrounding rocks after excavation and unloading of deep rock mass. The concentrated tangential stress is relatively larger on the tunnel walls, which decreases towards the interior of surrounding rocks with a certain gradient. To explore the fracture evolution characteristics of surrounding rocks under different tangential gradient stresses and understand various phenomena in the strainburst process, a large-scale true-triaxial gradient and hydraulic-pneumatic composite loading rockburst test device was adopted to carry out the strainburst tests under four different gradient stresses. Based on the macroscopic failure phenomena, distribution of rockburst debris, macro-micro morphology of failure cross section, and monitored data of acoustic emission (AE), the fracture evolution of rockburst specimens was analyzed under different stress gradient loadings. The results indicate that the stress gradient has an obvious influence on the fracture characteristics, resulting in different rockburst phenomena. With the increase of stress gradient, the failure stress of rockburst decreases, while the dynamic failure characteristics of rockburst trends to be significant. The increase of stress gradient contributes to higher fragmentation degree of debris, more uniform distribution and better continuity. The total number of cracks in the model decreases with the rise of the stress gradient, and the proportion of shear failure increases, which is the main reason for the enhancement of the rockburst intensity.