A rigid true triaxial apparatus for analyses of deformation and failure features of deep weak rock under excavation stress paths
作者机构：Key Laboratory of Ministry of Education on Safe Mining of Deep Metal MinesSchool of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2023年第15卷第5期
页 面：1065-1075页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：the financial support from the 111 Project(Grant No.B17009) the Liao Ning Revitalization Talents Program(Grant No.XLYCYSZX1902)
主 题：True triaxial apparatus(TTA) Deep weak rock Large deformation Excavation stress path Instantaneous unloading
摘 要：The squeezing scenario in deep weak rock tunnels can hinder underground ***,due to the limitations of test technologies at hand,the real excavation stress path cannot be mimicked in the ***,the large deformation mechanism of deep weak rocks still remains *** this,a true triaxial apparatus(TTA)to investigate the mechanical responses of deep weak rock under excavation stress paths in field and reveal the squeezing mechanism of deep tunnels is assembled and developed at Northeastern University,*** apparatus can perform instantaneous unloading in s3 direction based on electromagnetism *** addition,uniform loading and deformation measurements can be carried out based on the proposed linked interlocking clamp and antifriction device,even if the sample has a strong dilatation deformation ***,a bore trepanning is designed to capture noiseless acoustic emission(AE)signals for deep weak rock at a low ***,two tests were are conducted using this instrument to preliminarily understand the failure and deformation features of deep weak rock based on fractured *** results show that the complete stressestrain curves of fractured marble have the characteristics of low strengths and large deformations,and the larger deformation and the more serious failure occur when the fractured marble enters the post-peak state after *** results show that the developed apparatus is likely to be applicable for deep weak rock engineering.
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