Theoretical Research And Simulation Analysis Of Elastic Deformation Of Double-plate Cutterhead Of Full-face Rock Tunneling Boring Machine

In the construction of underground tunnels,full-face rock tunneling boring machines are used more and more widely due to their high efficiency,safety,and environmental protection.The cutterhead is located at the forefront of the full-face rock tunneling boring machine and is the most important part of the TBM.It not only bears the force from the rock breaking of the hob,but also receives the thrust and torque of the main engine.Therefore,in order to ensure the smooth progress of the tunnel construction,It is necessary to reduce the deformation and vibration of the cutterhead to ensure that the structural design of the cutterhead meets the requirements of rigidity,strength and stability.Based on the existing single-plate cutterhead theory,this paper uses software to establish more realistic single-plate and double-plate cutterhead models,and conducts numerical simulations on them.Through the statics and dynamics analysis of the cutterhead theory,it hopes to be more enriched.The deformation and vibration theory of the double-plate cutterhead structure design provides reference and basis for the relevant personnel when designing the cutterhead structure.The main contents of this paper are as follows:(1)Summarized the development history of the cutterhead structure of the full-face rock tunneling boring machine,and summarized the domestic and foreign theoretical research and numerical simulation methods in different periods.(2)The basic structure of the full-face rock tunneling boring machine is summarized,and the main components and functions of the TBM are summarized.The focus is on the cutterhead structure,including the cutterhead shape,the cutterhead panel,and the main bearing of the cutterhead,hob type,hob arrangement method,hob installation method,bucket,support ribs and ballast board and other structural components.(3)The deformation theory and vibration theory of the full-face rock tunneling boring machine are deduced,and the load theory of the disc hob is analyzed in detail.Based on the "elasticity theory",the elasticity of the veneer cutterhead is analyzed.Deformation equations and vibration frequency equations are derived.(4)The structure of the cutterhead was statically analyzed with ABAQUS software.By constructing a three-dimensional model of rock breaking-hob.the load condition of the cutterhead was obtained.and different thicknesses.different loads.different elastic moduli.and different The deformation law of the veneer cutterhead under Poisson’s ratio was studied.Then.through the modeling and simulation analysis of the double-plate cutterhead.the thickness of the front plate,the distance between the front and rear plates and the thickness of the back plate of the double-plate cutterhead are used as independent variables,and the deformation of the double-plate cutterhead is the dependent variable.The deformation of the single-plate cutterhead under the elasticity and Poisson’s ratio is fitted by a function.Finally,the elastic modulus and Poisson’s ratio function equations suitable for the double-plate cutterhead under the theory of elasticity are obtained.(5)The dynamic analysis of the cutterhead structure was carried out with ABAQUS software,and the research idea of orthogonal experiment method was adopted.The thickness of the front plate,the thickness of the back plate,and the distance between the front and rear plates of the double plate cutter were used as independent variables,and the maximum deformation The quantity and natural frequency are dependent variables,and the modal characteristics of the double-plate cutterhead under different orders are analyzed dynamically.