Numerical Simulation of Vibration Cutting for Asphalt Concrete Paving Based on Discrete Element Method

The demand for road miller is increasing continually as an important machine for maintenance of asphalt concrete paving. The research of domestic self-developed road miller with high-performance brooks no delay. The force of miller can be quantitative expressed by numerical simulation during working and numerical simulation has become an important mean of research for road miller's performance. three-dimensional discrete element method is used to model asphalt concrete paving that fits the macroscopic mechanical properties of road. Cutting process of road miller is simulated and cutting force is quantitatively expressed during simulation. Uniaxial compression and splitting tensile test are used to measure the compression modulus and tensile modulus of asphalt concrete paving, the obtained macroscopic criteria are used for verifying microcosmic parameters of contact and connection. Algorithm is programmed in PFC3 D to generate coarse aggregate with irregular polyhedron shape. Kinematic model is established to infer the critical condition of utilizing vibration cutting in road miller. The improvement of cutting force is analyzed when utilizing different mode of vibration during working process. The optimized mode of vibration is obtained, the amplitude and frequency of vibration are optimized.