Research On Coupling Effect Of Creep Deformation And Anchor Prestress Loss In Anchored Rock Mass

With the accelerated development of the urban construction process,underground engineering is moving deeper.Along with this,many problems will be faced,the deep geological environment is complex.The rock mass anchoring mechanism does not clearly restrict the safe development of deep engineering.Exploring the time-dependent mechanism and anchoring mechanism of deep anchored rock mass is a key scientific issue to ensure the safety and stability of deep anchored surrounding rock.(1)The rock properties were simulated by similar materials,and the basic mechanical properties of the specimens were obtained by uniaxial compression test.Through the uniaxial compression results of jointed rock mass and anchored jointed rock mass,the influence law of the angle between bolt and joint on the mechanical parameters of the specimen is obtained.(2)Through the uniaxial creep test of unjointed anchor specimens and different dip joints anchored specimens,the longitudinal and transverse creep laws and prestress loss laws were obtained.According to the stress characteristics of the bolt during the test,based on the local deformation theory of the anchor-slurry interface.The hyperbolic function of the axial force transfer law is revised.The bolt elastic modulus E?the radius r?the length l and the virtual coefficient T are applied to analyze the axial force.(3)Clarified the coupling effect between creep deformation and anchor prestress loss of anchored rock mass.The creep model of creep deformation and anchor prestress loss of anchored rock mass is established and the relevant parameters of the model are obtained,came up with the prestress loss calculation method.(4)Through the numerical simulation,the whole process of the uniaxial creep test was simulated.The deformation trend of the specimens?the deformation characteristics of the joint surface of the joint specimens?the test parameters and the contribution rate of the bolt's shear resistance were obtained in more detail.Multi-angle analysis the relationship between rock mass creep and anchor prestress.