西北水电Issue(5)：9-15,28,8.DOI:10.3969/j.issn.1006-2610.2025.05.002
早龄期堆石混凝土骨-胶界面剪切破坏过程中声发射特征分析
Analysis of Acoustic Emission Characteristics During Shear Failure Process of Aggregate-Matrix Interface in Early-Age Rock-Filled Concrete
摘要
Abstract
To understand the shear failure characteristics of the aggregate-matrix interface in early-age rock-filled concrete(RFC),this study investigated the changes in acoustic emission(AE)signals during the shear failure process of the interface.45°inclined shear tests were conducted under different ages(1,3,7,14,and 28 days)to explore the development of shear strength and failure characteristics of the early-age RFC aggregate-matrix interface.Combined with AE technology,the relationship between AE ring count and stress-strain curve was revealed;the RA-AF statistical method for AE signals was used to clarify the crack evolution law of the RFC aggregate-matrix interface,and the mixed Gaussian model based on RA-AF was applied to identify the interface cracking mode during the shear failure process.The results show that:the shear strength of the RFC aggregate-matrix interface increases the most in the first 7 days,reaching 42.9%,and the growth rate slows down after 7 days;during the shear failure process,the AE ring count is divided into5 stages,which are characterized by no AE activity,low AE ring count,stable growth,AE increase followed by decrease before the peak,and AE ring count reaching the peak,respectively;the cumulative ring count gradually increases with the increase of age;In the shear failure process of the aggregate-cement interface,tensile failure is dominant before7 days(tensile cracks account for 52.9%and52.4%respectively),while shear cracking becomes the main failure mode after7 days(shear cracks account for59.0%and63.7%respectively).The conclu-sions of this study can provide a theoretical basis and reference for the evaluation of the shear performance of early-age RFC.关键词
堆石混凝土/骨-胶界面/早龄期/声发射/剪切强度Key words
rock-filled concrete(RFC)/aggregate-matrix interface/early age/acoustic emission(AE)/shear strength分类
水利科学引用本文复制引用
陈淑玲,陈新孝,张天祺..早龄期堆石混凝土骨-胶界面剪切破坏过程中声发射特征分析[J].西北水电,2025,(5):9-15,28,8.基金项目
冰冻圈科学与冻土工程全国重点实验室开放课题(CSFSE-KF-2416) （CSFSE-KF-2416）
西京学院高层次人才专项基金(XJ23B07) （XJ23B07）
