Analysis on the Force on the Cutter Head Under Different Excavation Conditions Based on Discrete Element Method
The setting of parameters is of great significance for shield tunneling construction.Generally,it is necessary to comprehensively consider the excavation speed and cutter head speed during the construction process based on the soil layer situation and the performance of the shield tunneling machine.This article is based on the construction of mud water balance shield tunneling in the cross river tunnel between Wuhan Metro Line 12 Science Park and Danshuichi Reservoir.Using discrete element numerical simulation method,a soil layer and shield machine model were constructed in PFC3D software with reference to actual parameters.The shield machine excavation process was simulated,and the influence of different soil layer parameters,excavation speed,and cutter head speed conditions on the force on the cutter head was studied.The results indicate that the soil layer parameters have a significant impact on the force and excavation efficiency of the cutter head.The force on the cutter head is positively correlated with the excavation speed and negatively correlated with the cutter head speed,and then negatively correlated with the penetration.This law is mainly related to the compression and cutting effects of the cutter head on the soil.The research shows that the balance between the tunneling speed and the cutter head speed should be ensured when the tunneling parameters are adjusted during the construction process.
force on the cutter headexcavation parametersdiscrete element method
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