Parametric study to implement a water-weakening process in UDEC  

作　　者：Fengchang Bu Michel Jaboyedoff Marc-Henri Derron Lei Xue Yuan Cui Chao Xu 

机构地区：[1]Risk-Group-ISTE-Institute of Earth Sciences,University of Lausanne,Lausanne,1015,Switzerland [2]Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China [3]Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing,100029,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第3期1378-1386,共9页岩石力学与岩土工程学报(英文)

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.41977249 and 42090052;the China Scholarship Council under file No.202204910040.

摘　　要：Despite the prevalence and validity of the universal distinct element code(UDEC)in simulations in geotechnics domain,water-weakening process of rock models remains elusive.Prior research has made positive contributions to a presupposed link between modelling parameters and saturation degree,Sr.Nevertheless,this effort presents inaccurate results and limited implications owing to the misleading interpretation,that is,devoid of the basic logic in UDEC that modelling parameters should be calibrated by tested macroscopic properties in contrast to a presupposed relation with Sr.To fill this gap,a new methodology is proposed by coupling a computationally efficient parametric study with the simulation of water-weakening mechanisms.More specifically,tested macroscopic properties with different Sr values are input into parametric relations to acquire initial modelling parameters that are sequentially calibrated and modulated until simulations are in line with geomechanical tests.Illustrative example reveals that numerical water-weakening effects on macroscopic properties,mechanical behaviours,and failure configurations are highly consistent with tested ones with noticeable computational expediency,implying the feasibility and simplicity of this methodology.Furthermore,with compatibility across various numerical models,the proposed methodology substantially extends the applicability of UDEC in simulating water-weakening geotechnical problems.

关 键 词：Parametric analysis Universal distinct element code(UDEC) Water-weakening Rock strength 

分 类 号：TD3[矿业工程—矿井建设]