基于离散元法的沥青混凝土心墙与过渡层接触面剪切作用机制研究OA

The contact surface between the asphalt concrete core wall and the transition layer is a key weak zone.In this study,a mesoscopic numerical model of the contact surface between the asphalt concrete core wall and the transition layer is established using discrete element software PFC.By simulating multi-ring shear tests,the shear mechanism of the contact surface is investigated.The mesoscopic contact parameters are calibrated based on actual experimental data,verifying the consistency between the numerical model and laboratory test results.Through analysis of force chain evolution,particle displacement and rotation characteristics during shearing,the mechanical response mechanism of the contact surface at different shear stages is revealed.The results indicate that:(a)the shear resistance of the contact surface is closely related to the force chain network,and with the increase of normal pressure,the strong force chains gradually form and enhance the interface strength;(b)during shearing,the particle displacement progresses from local compression to global slippage,forming a distinct shear band.;and(c)under high normal stress,the interface failure manifests as the propagation of slippage bands and displacement concentration.