Simulation Analysis Of Basalt Fiber Reinforced Polymer Anchor Bolt In Highway Slope Reinforcement

Basalt fiber reinforced composite bolt（BFRP anchor）is a kind of green and low-carbon material which has the characteristics of good corrosion resistance and good bonding strength with concrete.The use of BFRP anchor in the reinforcement of highway slope anchor can solve the problem of easy corrosion of reinforced anchor and reduce the use of steel bars.However,there are few studies on the change law of anchoring performance of BFRP anchor under the action of pulling load,and even less studies on the optimization of design parameters of BFRP anchor in slope reinforcement Therefore,this paper conducts relevant research on BFRP anchor reinforcement slope through anchoring theoretical analysis.laboratory material test,drawing numerical simulation,analysis of influence rules of orthogonal test parameters,and optimization analysis of slope parameters of anchor reinforcement,etc.The main research results were obtained and are presented below:（1）The theory of anchoring effect of anchor bolt in rock and soil reinforcement is analyzed.By establishing the stress analysis model of micro-segment bolt under pulling load,The non-uniform distribution formula of bolt interfacial load is deduced and analyzed.This formula indicate that the interfacial decoupling length and peak shear stress can be inversely calculated from the maximum drawing load measured in the field.（2）The results obtained by laboratory test of materials are:The average values of tensile strength,elastic modulus,ultimate strain and shear strength of 4 kinds of BFRP bolts with diametric（10mm 12mm,14mm,16mm）are about 1000Pa,50GPa,2%and 175MPa respectively.Compared with ordinary steel bars,With high tensile strength.low elastic modulus,low failure strain,tensile failure has brittle fracture characteristics.and after 77 days of stress aging and 90 days of alkali solution corrosion,the tensile strength retention rate is greater than80%and 90%,respectively.The standard values of bond strength between BFRP anchor rod with diameter of 14mm and 16mm and concrete are about 8MPa and 11Pa respectively,which is greater than 4MPa of the bond strength of ordinary steel bar.（3）Through the drawing numerical simulation test,it is found that under load control conditions,the axial force and grouting shear force of the two kinds of BFRP bolts with the diameter of 14mm and 16mm respectively increase with the drawing load and anchoring length,and the main load is distributed in the front of the anchoring length.Under the displacement control condition,with the increase of anchoring length and confining pressure,the peak pulling capacity and corresponding displacement of the two kinds of BFRP anchors with diameters of14mm and 16mm respectively increase gradually.（4）For the reinforcement project of a typical marginally stable soil slope along a highway,BFRP anchor rod and reinforced anchor rod with the same diameter and anchoring length are used to strengthen the slope,and the anchoring effect of BFRP anchor rod on the slope is better than that of reinforced anchor rod.The influence degree of design parameters of BFRP anchor reinforcement on the safety factor of the slope is as follows:anchorage Angle>anchorage length>anchorage spacing.Considering the safety factor of slope stability,construction convenience and the lowest material usage the optimal parameter combination of BFRP anchor is A₁ B₄ C₂ as follows:the anchor length is10m,the anchor distance is 2.5m and the anchor Angle is 25°.At the same time.based on the optimal anchoring design parameters,the transverse stress of BFRP anchor in the critical state is analyzed.It can be found that the transverse stress of the anchor in this slope is small and the main load is axial...