摘要
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。
Fully dynamic analysis method based on local strength reduction is put forward to solve seismic stability problem of slope with controlled sliding zone. In this method, thin layer elements are established to simulate sliding sur- face between bedrock and sliding body according to geological survey map. The key point of overall safety factor is chosen near the last plastic zone of the sliding surface and the key point of local safety factor is chosen near the local plastic zone of possible slide channel. Based on the reduction stress filed of static analysis, the same degree of strength reduction is implemented to the dynamic analysis in the condition of viscoelastic artificial boundaries. The displacement saltation of key points is taken as an instability criterion. Example results show that the proposed method is reasonable and effective.
出处
《水电能源科学》
北大核心
2014年第1期89-92,共4页
Water Resources and Power
基金
水利部公益性行业科研专项(201001035)
国家自然科学基金项目(51209076)
江苏省普通高校研究生科研创新计划(CXZZ13_0254)
关键词
滑带控制型边坡
动力稳定
粘弹性人工边界
完全动力分析法
局部强度折减法
slope with controlled sliding zone
dynamic stability
viscoelastic artificial boundaries
fully dynamic a nalysis method
local strength reduction method
