Simulation Analysis Of Vibration Characteristics Of TBM Cutter Under Different Front And Rear Plate Thickness And Spacing

Due to its safety,high efficiency and environmental protection,TBM is more and more widely used in underground tunnel construction.The cutter head is located at the front end of the TBM and bears the complex load caused by the hob group breaking rock.In order to ensure the smooth and efficient tunneling work,the strength and rigidity of the cutter head must be ensured to avoid excessive deformation and vibration.Due to the complex force of the cutterheaa in actual engineering,the external load varies with geological conditions and construction parameters.Therefore,it is not enough to perform static analysis on the cutterhead.It is also necessary to carry out dynamic analysis of the cutterhead more realistically.In this paper,based on practical engineering,a more realistic double-plate cutter head model is established,and the cutter head load is obtained through the rock-breaking simulation model of hob.Secondly,the static analysis and modal analysis of the cutter head are carried out to study the law of the strength and rigidity of the cutter head changing with the thickness and spacing of the front and rear plates of the cutter head.Finally,the harmonic response analysis of the cutter head and the transient analysis of the cutter head under multi-point excitation are carried out to study the characteristics and rules of the deformation and vibration of the cutter head.Law provides reference and basis for the design of cutter head structure.The main work of this paper is as follows:(1)Summarized the development and application history of TBM,as well as the domestic and international research status of the force of cutter head,cutter head vibration and cutter head structure design;explained the classification,main structure and working principle of TBM.The main contents and development status of the cutterhead structure design are summarized,and the theoretical formulas of the force,deformation and vibration of the cutter head are also summarized and deduced.(2)According to the actual project,the double-plate cutter head model is established,and the cutter head external load is obtained by the method of hob rock breaking simulation;The structure of the cutter head is adjusted by changing the thickness of the front and rear plates and the spacing between the two plates.The static and modal analysis of the cutter head under different structural parameters are carried out to explore the influence of the thickness and spacing of the front and rear plates on the stiffness and strength of the cutter head,The original cutterhead is optimized according to relevant conclusions.(3)By applying simple harmonic load,the harmonic response of the cutter head is analyzed to obtain the vibration and deformation law of the cutter head at different frequencies,and the participation degree of each modal mode in the vibration of the cutter head.Finally,the results before and after the optimization of the cutter head are compared.(4)By applying multi-point concentrated random loads,the transient analysis of the cutter head is carried out,and the deformation characteristics and rules of different regions at the moment of starting of the cutter head under multi-point excitation are explored.Finally,the results before and after optimization of the cutter head are compared.