Investigation of concrete pavement cracking under multi-head impact loading via the continuum-discontinuum element method

摘要: Abstract To accurately and effectively simulate the cracking crushing process of concrete pavement under multi-head impact loading, a large-scale road 3D model that considers pavement, subgrade soil foundation is established. Then, discontinuum element method applied in pavement's potential fracture area, continuum hammer body non-fracture area pavement. A cohesive to interface contact used deal with interaction between Mesoscopic simulations on are conducted by considering shapes, three-dimensional aggregates, locations velocities. Finally, testing core drilling field evaluate simulation results. The results demonstrate can be quickly simulated via continuum-discontinuum (CDEM), agree in-site tests. meshed tetrahedral elements includes aggregates result higher calculation efficiency superior performance. Concrete severely crushed closed quadrangle crack surfaces form along inside four hammerheads, tension mainly propagate long axis rectangular hammerheads. affect distribution velocities determine degree. As velocity increases, force linearly changes, whereas degree varies according power function. Overall, influence greater than locations.