Static loading model test design for tunnel lining components based on gabion
[Objective]Gabion is widely used in slope stabilization,revetment engineering,subgrade reinforcement,and other applications.However,its use in tunnel lining remains underexplored.Owing to its unique multiporosity,which provides excellent deformation capacity and notable bearing strength,gabion shows promising potential for managing the notable deformations and high ground stresses encountered in tunnel surrounding rock.Therefore,studying the static mechanical behavior of tunnel lining components made with gabion is of practical importance.[Methods]This paper presents a simplified molding technique for gabion components and a custom-designed test loading apparatus.Additionally,a numerical modeling methodology specifically tailored for gabion components in tunnel lining is introduced based on discrete element calculations.Next,a comparative analysis is conducted to examine the influence of two key parameters-the strength of the gabion mesh and the effective modulus of the stone filling—on the variation in static mechanical characteristics of tunnel lining components constructed with gabion.This study provides valuable insights into the performance of gabion-based tunnel linings.[Results]1)The failure of the gabion component in tunnel lining mainly occurs through instability,with only minor cases of wire breakage and stone-filling fracture.Throughout the loading process,the load-displacement curve of the component exhibits notable fluctuations driven by the ongoing interaction between the internal stone filling and the gabion mesh.The overall load-displacement curve increases and then decreases.Despite considerable deformation,the component maintains a high bearing capacity at the end of loading.2)The tensile strength of the gabion mesh has little effect on the deformation modulus during the initial deformation stage under static load but has more impact on the peak load.The higher the tensile strength of the gabion mesh,the greater the displacement and peak strength at peak load.Under varying tensile strength conditions,the differences in peak load displacement and peak strength reached 28.9％and 25.2％,respectively,because when the tensile strength of the gabion mesh is higher,the component is more resistant to failure,allowing a more effective interaction between the stone filling and the gabion mesh.3)Compared with the tensile strength of the gabion mesh,the effective modulus of stone filling has a pronounced impact on the component performance.As the effective modulus of the stone filling increases,the postpeak decline in the load-displacement curve becomes more prominent.During the loading process,the energy consumption of the component,peak loading strength,and effective modulus of the stone filling exhibit a distinct piecewise relationship,characterized by an initial increase followed by stabilization.[Conclusions]This experiment provides clear guidance for students conducting static loading mechanical model tests on gabion-constructed tunnel lining components,enhancing the effectiveness of experimental teaching.
gabionexperimental loadinglocal lining componentstatic loadingdiscrete element analysis
万方数据
维普
