Anisotropic characteristics and creep model for thin-layered rock under true triaxial compression  

作　　者：Tianxiang Song Xia-Ting Feng Yangyi Zhou Chengxiang Yang Xiaojun Yu 

机构地区：[1]Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,School of Resources and Civil Engineering,Northeastern University,Shenyang,110819,China [2]Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology,Northeastern University,Shenyang,110819,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第12期4815-4834,共20页岩石力学与岩土工程学报（英文）

基　　金：the financial support from the 111 Project(Grant No.B17009);the Liao Ning Revitalization Talents Program(Grant No.XLYCYSZX1902).

摘　　要：The failure phenomenon of thin-layered rock tunnels not only exhibits asymmetric spatial characteristics,but also significant time-dependent characteristics under high in-situ stress,which is attributed to the time-dependent fracture of thin-layered rocks.This paper conducted a series of true triaxial creep compression tests on typical thin-layered rock siliceous slate with acoustic emission technique to reveal its anisotropic time-dependent fracture characteristics.The anisotropic long-term strength,creep fracturing process,and fracture orientation characteristics of thin-layered rocks under different loading angles(b,u)and intermediate principal stress were summarized.A three-dimensional(3D)non-linear visco-plastic creep model for thin-layered rock was developed to simulate its anisotropic creep behavior.The time-dependent fracturing of rocks during true triaxial creep loading is reflected through the change of equivalent strain based on an improved Euler iteration method.By constructing the plastic potential function and overstress index related to loading angles and stress state,the anisotropic timedependent fracturing process and propagation of thin-layered rocks under different loading angles and intermediate principal stress are expounded.The model was validated experimentally to show it can reflect the long-term strength and creep deformation characteristics of thin-layered rocks under true triaxial compression.

关 键 词：Inherent anisotropic rock Creep failure True triaxial compression Three-dimensional creep model 

分 类 号：TU45[建筑科学—岩土工程]