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基于离散单元法DEM,推导颗粒黏结-阻尼振动-运动演化方程,建立三维陡峭岩体模型,在地震横波与纵波条件下,进行岩体渐进式破坏演化动态过程模拟,在模型中实时跟踪9个监测点相关力学及运动参数,分析从稳定至滑动,再到碎石运动演化过程中参数变形情况。结果表明:细观颗粒间从黏结到损伤断裂再到运动的过程中,非线性运动特征差异化明显。水平向横波作用下,左侧岩体渐进式破坏严重,呈现出断裂-分离-接触碰撞-再分离的运动演化过程。不同振动强度下,岩体破损程度差异明显,振幅15以上岩体破坏严重。纵波单独作用下,岩体虽发生水平向裂纹,中部发生较大变形,但整体结构保持较好;模拟发现横波是岩体破坏的主要因素,纵波和横波叠加作用下两侧岩体破坏严重。
Based on the discrete element method (DEM), the particle cohesion-damping vibration-motion evolution equation is deduced, and the three-dimensional steep rock mass model is established. Under seismic shear wave and longitudinal wave conditions, the dynamic evolution process of progressive failure of rock mass is simulated. Nine Relevant mechanics and motion parameters of the monitoring points were monitored to analyze the parameter deformation during the evolution from stable to slip to gravel movement. The results show that there is a significant difference in the nonlinear motion characteristics among the mesoscopic particles during the process of bonding to the damage and fracture. Under the action of horizontal shear wave, the progressive destruction of the left rock mass is serious, showing the evolution of the fracture-separation-contact collision-re-separation. Under different vibration intensities, the difference of rock mass damage is obvious, and the rock mass with amplitude above 15 is seriously damaged. Under the action of P-wave alone, although the horizontal cracks occur in the rock mass and the central part of the rock mass undergoes large deformation, the overall structure remains well. The simulation shows that the shear wave is the main factor of the rock mass failure and the rock mass on both sides is seriously damaged.