Study On Anchoring Mechanism And Application Of Anchored Jointed Rock Mass

At present,prestressed anchoring technology is widely used in geotechnical engineering because of its obvious supporting effect and quick and convenient construction.Especially the application of anchoring technology in underground caverns,high slope reinforcement,and tunnel engineering is a relatively common construction technology.Prestressed anchoring technology has achieved rich achievements in design,construction,anchoring mechanism,and post-construction monitoring after construction.Results.Because in actual engineering,the rock and soil body is complex and diverse,the joint surface inside the rock and soil body has the characteristics of different sizes and uneven distribution,which makes the continuity of the rock body destroyed,and the mechanical properties and stability Play an important control role.The mechanical properties of the joint surface are closely related to its formation background,the geological environment and the supporting method used in the project,which leads to shortcomings in the study of the anchoring mechanism of the jointed rock mass.insufficient.Therefore,based on the existing theoretical research,the method of numerical simulation is used to study the mechanical properties of the joint rock joint surface under different bolt parameters and its design to improve the joint rock slope and apply it to It is of great significance in the stability analysis of jointed rock slopes.Based on the previous research results,the thesis carried out research on the anchoring mechanism of anchored jointed rock mass from four aspects: theoretical analysis,numerical simulation,engineering application and on-site monitoring of jointed rock high slope,Analyze the mechanical properties of the anchor joint surface.It provides a reference for the optimization design and stability analysis of similar jointed rock slopes.The content of this research mainly includes the following aspects:(1)Analysis of anchoring mechanism of jointed rock mass.The thesis first analyzes the mechanical properties of the joint surface in the jointed rock mass,divides it into the shear joint surface and the tensile joint surface according to the mechanical causes of the joint surface,and summarizes its development and failure characteristics;then,the shear strength calculation of the joint surface Make a deduction to clarify the destruction characteristics of the joint surface.At the same time,based on the deformation stress analysis of the anchoring joint surface and the calculation of the shear strength of the joint surface under the anchoring effect,the anchoring mechanism of the joint surface under different anchor rod lengths and different anchoring angles is discussed.(2)Numerical simulation analysis of anchored jointed rock mass.The FLAC3 D numerical simulation software was used to analyze the mechanical properties of the joint surface under anchoring.The cable element in FLAC3 D is used to simulate the anchor joint reinforcement surface.By changing the parameters of the anchor element,the stress,displacement and shear strength characteristics of the joint surface under different anchor lengths and different inclination angles are discussed.Comparison and verification with theoretical analysis to further summarize the anchoring mechanism of inductively-jointed rock masses.(3)Engineering application analysis.Based on theoretical analysis and numerical simulation research,a high rock slope of a section rock mass is taken as an example during the construction of a highway under construction in Guizhou Province.The anchoring length and anchoring angle of the jointed rock slope are optimized,the strength reduction method is used to calculate the stability of the jointed slope,and a reasonable support method is obtained through comparative analysis.Finally,the shear stress cloud maps of the joint surface of jointed rock mass slopes under the conditions of 30 ° inclination of anchor bolts,4m,6m,9m,12 m,15m,18 m,21m and no-anchor conditions It is clarified that after anchoring the joint surface existing in the jointed rock mass,its shear failure is suppressed and the shear strength of the joint surface is improved.(4)On-site monitoring of high slopes.The whole process is monitored from the unsupported excavation stage to the completion of the joint slope support,and the displacement and deformation of the slope and the deformation rate of each monitoring point are obtained through analysis of the monitoring data.Judging the stability of the slope and ensuring the safety of the construction,it also verifies the accuracy of the numerical simulation and the control effect of the anchor rod on the joint surface in practical engineering applications.