Research on the Energy Evolution Mechanism in Rock Breaking and Excavation Parameter Optimization of TBM Cutters Under the Condition of Argillization
During the excavation process of tunnel boring machine(TBM)in the mudstone strata,the residue soil is prone to form slurry that adheres to the surface of the cutter and cutterhead,resulting in the phenomenon of"mud cake",which seriously reduces the excavation efficiency.In order to reveal the influence of argillization on the rock breaking efficiency of TBM cutters and prevent argillization,the discrete element program PFC3D was used to simulate the process of TBM cutters rotating and cutting mudstone.The total energy of the system E,elastic strain energy Ee,friction energy Eμ,damping energy Eβ,kinetic energy Ek and adhesive energy Ea were calculated,and the rock breaking mechanism of TBM cutters under the condition of argillization was studied from the perspective of energy evolution.Subsequently,the energy characteristics of TBM cutters during rock breaking under different cutterhead thrusts,rolling cutter blade angles,and blade widths were analyzed.According to the principle of"the lowest accumulated heat and adhesive energy,and the minimum mass of slurry adhered to the surface of the cutter",the above excavation parameters were optimized.The research results indicate that the cohesive rolling resistance linear model in PFC3D can achieve the argillization process of cutter.Under the condition of argillization,the formation of slurry will significantly increase mechanical work,consume a large amount of energy,and reduce the efficiency of rock breaking with rolling cutters.Increasing the thrust of the cutterhead can promote the formation of slurry,causing the cutterhead to heat up and inducing slurry to adhere to the surface of the cutter.Selecting a V-shaped cutter with a blade angle of 40° and setting the optimal blade width to 13 mm can reduce the occurrence of argillization.The research can provide a theoretical reference for the prevention of"mud cake"in related engineering projects.
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