考虑动态临界加速度的地震边坡永久位移预测模型研究

在区域边坡地震危险性评价中主要采用永久位移预测模型进行地震边坡永久位移计算.永久位移预测模型以Newmark滑块理论为基础,通过大量实测地震时程记录统计拟合得出.针对Newmark理论中滑动面抗剪强度参数保持不变和已有位移预测模型的计算位移小于实测位移的问题,利用动态临界加速度理论,分别构建含有峰值加速度和阿里亚斯强度...

A Prediction Model for Permanent Displacement of Seismic Slopes Considering Dynamic Critical Acceleration

The prediction model of permanent displacement, mainly used to calculate permanent displacement of seismic slope in hazard assessment of regional seismic slope, is based on the Newmark sliding theory, and is obtained by statistical fitting of a large number of measured seismic acceleration records. Aiming at the problem of the shear strength parameters of a sliding surface remaining unchanged in the Newmark theory, and the calculated displacement from the existing prediction model of permanent displacement being less than the measured displacement, two prediction models of displacement, including peak acceleration and Arias intensity, are established using the theory of dynamic critical acceleration. The rationality of the permanent displacement calculated by the model is discussed. It was found that the permanent displacement calculated by the proposed model is close to the actual displacement of an earthquake landslide. The model can solve the present problem wherein the predicted displacement is less than the measured displacement. On the basis of further discussion and development, this model can meet more theoretical applications in engineering practice, and provide new ideas for seismic risk assessment of regional slopes.