Study On Shear Deformation Characteristics And Anchor Effecting Of Structural Surfaces Strengthened With Prestressed Anchor Cables

The discontinuities formed by fractures or weak surfaces of rock masses are a common phenomenon in rock mechanics and engineering.A large number of engineering practices have shown that the instability of rock slopes is closely related to the expansion large structural planes.In actual slope treatment,anchor cables are often used to reinforce structural surfaces,which forms an anchored discontinuous rock mass-structure system in the jointed rock mass.Through anchor reinforcement is widely used as the most effective and economical support method in rock slope reinforcement treatment,the design and construction of anchoring engineering still only relies on some experience of rock mass anchoring because of the mechanical characteristics of large-scale anchored structural surfaces are not completely clear so that in the design,the effect of comprehensive anti-sliding effect under shear deformation conditions is not fully considered but the tensile.Therefore,further research on the reinforcement mechanism of the anchored structural surface has important theoretical significance and reference value for more effective use of the anchor cable.Based on previous studies,the shear strength formula of the anchored structural plane is derived by using the indoor shear test,numerical simulation and theoretical analysis,and the angle change of the anchor cable after bending in the shear process is considered.The calculation result is more reasonable,and can reflect the reinforcement effect of the anchor cable,which can be applied to the engineering design and calculation.This paper analyzes the stress and deformation evolution process of anchor cable and rock mass during the shear process of structural plane,studies the coupling mechanism of rock mass and anchor cable,further constructs the analysis model of anti-sliding and anti-shear of prestressed anchor cable,reveals the evolution law of axial force and shear force of anchor cable,and puts forward a new method to determine the failure mode of anchor cable.Finally,the influencing factors of the failure mode of anchor cable are analyzed,and the main influencing factors on the failure mode of anchor cable are revealed.The research content of this paper can provide theoretical support for the structural surface design and evaluation methods.