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采用颗粒离散单元法(PFC)进行地震动力时程计算时,人工截断边界上需设置吸收边界条件,以防止波的反射。鉴于PFC数值计算模型的人工边界上颗粒单元半径大小不一、边界面凸凹不平,在连续介质的黏性吸收边界条件方程基础之上,推导出适用于离散介质的等效方程。在离散介质的等效方程中引入微调系数,建立确定其最优值的方法,以实现对波的最佳吸收。采用合成岩体方法(SRM)建立顺层岩质边坡和逆层岩质边坡结构面网络模型。基于提出的方法,在边坡颗粒流数值模型的人工边界上设置黏性吸收边界,对含有正交次级节理的顺层岩质边坡和逆层岩质边坡的地震破坏过程进行模拟,对其地震破坏机制进行系统分析,相关研究结论对边坡地震破坏机制研究具有重要意义。
When using the PFC method to calculate the seismic dynamic time-history, the boundary condition of the artificial truncation boundary should be set to prevent the reflection of the wave. In view of the fact that the radius of grain unit on the artificial boundary of PFC numerical model is different and the boundary surface is uneven, the equivalent equation suitable for discrete medium is derived based on the equation of viscous absorption boundary condition of continuous medium. In the discrete medium equivalent equation to introduce fine-tuning coefficient, to establish the method to determine the optimal value, in order to achieve the best absorption of the wave. Synthetic rock mass method (SRM) is used to establish the structural network model of bedding rock slope and reverse rock slope. Based on the proposed method, the viscous absorption boundary is set on the artificial boundary of the particle flow numerical model of slope, and the earthquake damage process of the bedding rock slope and the reverse rock slope with orthogonal secondary joints is simulated. Systematic analysis of the earthquake damage mechanism is carried out, and the relevant research conclusions are of great significance to the research on the earthquake damage mechanism of slope.