DOI: 10.11799/ce202501018
Similar simulation on creep characteristics of deep roadway surrounding rock with cyclic loading and unloading
LU Xiaoyu
ZHANG Bowen
DONG Chunliang
XIE Ya
LI Zhiyong
Abstract：In order to study the creep effect of roadway excavation in underground rock mass under complex ground stress,the model made of similar materials was loaded and unloaded.The results show that,after a long period of graded cyclic loading and unloading,the roadway subsidence occurs at 80%of the compressive strength of the model,and the radius of the roadway decreases by 1.8%.The strain of surrounding rock exhibits creep characteristics with time,experiencing stages of instantaneous strain,steady strain,hysteretic elastic recovery strain and residual strain.With increasing the load step by step,the strain value and elastic recovery strain both increase,but the increment of strain at each stage gradually decreases,reflecting the transition from elastic deformation to plastic deformation,showing a certain degree of permanent deformation.The trend of volume strain at each point is roughly the same as that of strain variation.Due to the application of load,the original stress state of surrounding rock is changed,resulting in stress concentration,and the creep of surrounding rock is caused by long-term cyclic loading and unloading,which promotes the emergence and expansion of cracks.In addition,the formation and development of cracks further aggravates the deformation of the roadway,resulting in the overall subsidence of the roadway and its shape becoming irregular.
Keywords：similar simulationsurrounding rock creepcyclic loading and unloadingstrain analysisfracture development
Publication Date：2025-01-19
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 129-136 )