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为了模拟与预测岩质高边坡在开挖卸荷过程中的变形特征,把高边坡离散为由颗粒单元与梁网络组成的复合结构,用离散元法描述颗粒单元运动,通过颗粒间的相对位移计算梁的变形及梁端力,通过梁的变形与破坏体现介质的损伤与渐进变形,并通过对单轴抗压实验的模拟验证模型与程序的可靠性,对三峡永久船闸高边坡开挖卸荷变形进行了模拟.结果表明:模拟结果与实测结果吻合较好,相差3%左右,说明基于离散元框架内的梁-颗粒模型可以反映高边坡卸荷变形机理.
In order to simulate and predict the deformation characteristics of rocky high slope during excavation and unloading, the high slope is separated into a composite structure composed of particle unit and beam network. Discrete element method is used to describe the movement of particle unit, The deformation and the beam end force of the beam are calculated by the relative displacement. The damage and gradual deformation of the medium are reflected by the deformation and failure of the beam. The reliability of the model and program is verified by simulation of the uniaxial compression test. The results show that the simulation results are in good agreement with the measured ones and the difference is about 3%, which shows that the beam-particle model can reflect the unloading deformation mechanism of high slope based on the discrete element framework.