Introduction of dynamic constitutive model into parallel computing system of strata motion and modeling of impact fracture process of roadway
WANG Xuebin
ZHANG Qinjie
PAN Yishan
MA Liqiang
LI Xiaoshuai
LIU Dong
BAI Xueyuan
CHEN Shuangyin
Abstract：It is theoretically and practically significant to study the dynamic fracture of the roadway surrounding rock un-der impact for analyzing mechanisms of roadway rockbursts and for predicting and preventing them.When roadway rock-bursts are modeled on the microcomputer,the foreign commercial software has small-scale computing capacity,low com-puting efficiency,and limited applicability.In the present paper,based on the GPU parallel computing system of the strata motion,i.e.,StrataKing developed by us in the past ten years,the dynamic modeling ability is developed.The present method is validated through modeling the dynamic tests for rock specimens in uniaxial compression.The static con-stitutive model(the Hooke's law)is replaced by the Zhu-Wang-Tang dynamic constitutive model applicable in a wide range of strain rates.The static cohesion in the Mohr-Coulomb criteria is replaced by the dynamic cohesion to consider the dynamic strength of rock.The local adaptive dumping leading to over damping in the dynamic modeling is replaced by the viscous dumping.The model composed of a roadway and its surrounding rock is impacted at the top of the model in the form of the constant velocity.Effects of the velocity on the instability of the model are investigated.At low strain rates,the instability of the model exhibits intermittent characteristics,which is due to the fact that the strength of the surrounding rock is low and few strain energy is stored.Thus,instability begins and ends easily,but no kinetic enough is provided for a serious large instability.However,at high strain rates,the development of the cracking regions at two sides of the road-way is very rapid,which is due to the fact that the need energy can be provided timely.Thus,the instability is continuous.When the stored strain energy is high,the instability takes place and ending is difficult,resulting in a serious dynamic haz-ard.The present work provides a good technical base for the study on the anti-impact of the roadway under support in the future.
Keywords：roadway rockburstdynamic constitutive modelviscous dampingparallel computingcontinuum-discon-tinuum method
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 1473-1483 )