Calibration of coupled hydro-mechanical properties of grain-based model for simulating fracture process and associated pore pressure evolution in excavation damage zone around deep tunnels

作     者：Kiarash Farahmand Mark S.Diederichs Kiarash Farahmand;Mark S.Diederichs

作者机构：Department of Geological Sciences and Geological EngineeringQueen’s UniversityKingstonOntarioK7L 3N6Canada Golder AssociatesVancouverBritish ColumbiaCanada 

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：2021年第13卷第1期

页      面：60-83页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 081503[工学-水工结构工程] 

基　　金：the Nuclear Waste Management Organization(NWMO)of Canada the Natural Sciences and Engineering Research Council of Canada(NSERC) 

主　　题：Coupled hydro-mechanical properties Excavation damage zone(EDZ) Grain-based model(GBM)calibration Stress-fracturing of rock Cohesive crack model Stress-dependent permeability 

摘      要：The objective of this paper is to develop a methodology for calibration of a discrete element grain-based model(GBM)to replicate the hydro-mechanical properties of a brittle rock measured in the laboratory,and to apply the calibrated model to simulating the formation of excavation damage zone(EDZ)around underground ***,a new cohesive crack model is implemented into the universal distinct element code(UDEC)to control the fracturing behaviour of materials under various loading ***,a methodology for calibration of the components of the UDEC-Voronoi model is *** role of connectivity of induced microcracks on increasing the permeability of laboratory-scale samples is *** calibrated samples are used to investigate the influence of pore fluid pressure on weakening the drained strength of the laboratory-scale *** validity of the Terzaghi’s effective stress law for the drained peak strength of low-porosity rock is tested by performing a series of biaxial compression test ***,the evolution of damage and pore pressure around two unsupported circular tunnels in crystalline granitic rock is studied.