Flac^3D Numerical Simulation Study On Deformation And Failure Of Surrounding Rock Of Roadway In Inclined Strata

In order to study the deformation and failure mechanism of surrounding rock in deep inclined rock roadway,the FLAC^3D numerical simulation experiment method is used to study the deformation and failure process of surrounding rock in 0°,30°,45°,60°and 90°inclined rock roadway.The numerical experiment results are compared with the previous physical model experimental results,and the characterization of the mechanical response of the strain duration curve in the physical model experiment is extracted.Finally,the deformation and failure characteristics of surrounding rock of roadway in inclined rock strata with different dip angles are studied comparatively,and the laws related to the dip angle of rock strata are extracted.Through the above research,the law provides a reliable reference for reasonable excavation and effective support of the roadway of this project and similar projects.?1?In the numerical simulation experiment part,according to the numerical experimental results,the displacement field distribution characteristics,stress field distribution characteristics and plastic zone distribution characteristics of surrounding rock of roadway are analyzed.According to the field observation and record,the roadway deformation and deformation trend numerically simulated in this paper is consistent with the engineering site results.The research results are as follows:1)The stress in the direction of roadway strike has an important influence on the development of plastic zone of roadway surrounding rock.The developing range of plastic zone of roadway surrounding rock increases gradually with the decrease of stress in the direction of roadway strike.2)The outer edge of the plastic zone at the direct top of the inclined rock roadway is parallel to the normal of the rock formation,and it can be judged that the shear deformation is the main failure mode.?2?In the comparative study of numerical simulation experiment and physical model experiment,through the comparative study of numerical simulation and previous physical model experimental results,the characterization characteristics of strain-time curve mechanical response are extracted,and the deformation and failure mechanism of inclined roadway is systematically expounded.?3?Comparative analysis of experimental results of numerical simulations at different angles.Based on the stable laws obtained from numerical experiments and physical experiments,the deformation and failure laws of surrounding rock in different rock stratum angles are summarized.Main findings:1)Since the normal stiffness of the rock layer is smaller than the layerwise stiffness,the variation of the displacement and stress field of the surrounding rock in the tunnel has a wider range of influence on the normal direction of the rock than in the direction along the rock.2)In the deformation and failure of surrounding rock of 0°,30°,45°,60°and 90°inclined rock roadway,the tensile and shear plastic zone is prone to occur in the coal seam,while the tensile plastic zone is prone to occur in the mudstone.3)The stress in the direction of the roadway has an important influence on the development of the surrounding plastic zone of the roadway and the stability of the surrounding rock of the roadway.The development range of the surrounding plastic zone of the roadway gradually increases with the weakening of the roadway strike stress.4)The shear plastic zone in the coal seam near the roadway has an impact on the stability of the mudstone adjacent to the coal seam.The mudstone rock formation near the roadway can be simplified to the stability of the compression bar under the weak constraint of the coal seam.