Study On Action Mechanism And Design Method Of Slope Strengthened By BFRP Bolt

As an important means of slope reinforcement and disaster prevention,the durability and safety hazards caused by its corrosiveness have been widely concerned by the industry.Basalt fiber composite bolt(BFRP bolt)is not only light and high-strength,but also has outstanding corrosion resistance.It is expected to provide effective solutions to this problem.This paper comprehensively analyzes the previous research results on slope anchorage and BFRP bolt,and discusses the effect before and after reinforcement with BFRP Bolt Based on static similarity model test;Based on the numerical simulation,the orthogonal combination analysis of the design parameters of multiple types of anchor bolts is carried out to determine the sensitivity of the design parameters;Based on the research results of test and numerical simulation,based on the existing specifications,the design optimization method of BFRP bolt is proposed,and the method is applied and verified by numerical simulation.The main research results are as follows:(1)Based on the derivation of similarity theory and the study of similar materials,the similarity model test is carried out on the unsupported and BFRP anchored slope by using the method of graded loading on the slope top,and the ultimate bearing capacity,slope top settlement and slope displacement of the slope are compared and analyzed,so as to determine the reinforcement effect of BFRP anchor structure.The results show that BFRP bolt has a significant effect on slope stability and can better restrict slope deformation,and the restraint effect is mainly horizontal restraint.(2)Plaxis3d is used for numerical modeling,and the model is modified based on the test results.On this basis,the orthogonal combination analysis is carried out for five kinds of design parameters,such as anchor angle,anchor length,diameter,horizontal spacing and elastic modulus.According to the calculation of 25 working conditions,the influence mode and degree of five kinds of design parameters on the stability of BFRP anchored slope are obtained.The importance order of the five kinds of design parameters is as follows: bolt length >anchorage angle > bolt diameter ≈ bolt horizontal spacing ≈ bolt elastic modulus.(3)Based on the research results of test and numerical simulation,based on the analysis and summary of the failure mode of BFRP anchor,it is determined that the "design method of traditional reinforced anchor" is the improvement basis,the "calculation of anchor length" is the improvement direction,the "progressive failure coefficient C of anchor" is introduced,and the design optimization method of BFRP anchored slope is put forward,Plaxis3 d is used to verify the effectiveness and scientificity of this method.