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针对滑带控制型边坡动力稳定性问题,提出了一种基于滑带局部强度折减下的完全动力有限元分析方法,根据地勘资料在基岩和滑体间建立薄层单元模拟滑带,以滑带最后塑性屈服附近点作为整体安全系数关注点,以可能形成滑动通道的局部贯通点作为局部安全系数关注点,采用粘弹性人工动力边界,在静力折减应力场的基础上进行同等程度下的动力折减,根据关注点动力位移拐点进行动力失稳判断。实例应用结果表明,该方法合理、有效。
Aiming at the dynamic stability of slide-controlled slope, a complete dynamic finite element analysis method based on local strength reduction of slide zone is proposed. According to the geologic prospecting data, a thin-layer unit simulated slide zone is established between bedrock and slide body, Taking the point near the final plastic yield point of the sliding band as the focus of the overall safety factor, the local penetration point that may form a sliding channel is taken as the focus of the local safety factor. The viscoelastic artificial dynamic boundary is adopted and the equivalent stress field is reduced on the basis of static reduction Degree of power reduction, according to the focus point of dynamic displacement inflection point to determine the power instability. The example application shows that this method is reasonable and effective.