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真实反映地震动传播特性的分析方法是准确描述岩体地震反应的基础。基于显式波动有限元,采用能够考虑应变率影响的弹粘塑性本构模型,提出了一种用于分析岩体地震反应的新方法,编制了相应的计算程序。以均质岩石边坡为例,计算了EL-CENTRO波输入下边坡的位移和应力反应,并将计算结果与采用粘弹性本构模型的结果进行了比较,初步验证了程序的可靠性。计算结果表明,所提出的新方法能够较合理地计算出地震作用下边坡的永久位移和残余应力。
The analysis method that truly reflects the characteristics of earthquake propagation is the basis for accurately describing the seismic response of rock masses. Based on the explicit fluctuating finite element method, a new visco-plastic constitutive model that can consider the effect of strain rate is proposed, and a new method for analyzing the seismic response of rock mass is proposed. Corresponding calculation programs are compiled. Taking the homogeneous rock slope as an example, the displacement and stress response of slope under EL-CENTRO wave input were calculated. The calculated results were compared with the results of using the viscoelastic constitutive model to verify the reliability of the program. The calculation results show that the proposed new method can calculate the permanent displacement and residual stress of the slope under the earthquake.