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首页> 外文会议>Sino-Japan Geotechnical Symposium November; 20071104-07; Chongqing(CN) >EFFECTS OF TIME-HISTORY VERTICAL ACCELERATION ON SEISMIC DESIGN OF HIGH ROCK-FILL DAMS
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EFFECTS OF TIME-HISTORY VERTICAL ACCELERATION ON SEISMIC DESIGN OF HIGH ROCK-FILL DAMS

机译：时滞垂直加速度对高填石坝抗​​震设计的影响

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摘要

The behaviors of high rock-fill dams under seismic conditions can be effectively studied by evaluating the earthquake-induced sliding displacements, which are key parameters in the recent performance design approaches. Conventional methods of determining the critical acceleration in Newmark sliding method are based on pseudo-static stability analyses employing either a horizontal inertial force or a combination of horizontal inertial force and vertical inertial force which has a fixed proportion (such as 2/3 or 1/2) to the former and assumes to be a static force acts upwards or downwards. Besides, the effects of magnification and unhomogeneity of vertical acceleration are neglected. The seismic performances of a high rock-fill dam subjected to combined horizontal and vertical seismic accelerations are investigated in this paper by extending the sliding body methodology proposed earlier by Newmark. The time-history vertical acceleration is used in each step of dynamic stability analysis and critical acceleration determination. It is shown that time-history vertical acceleration has significant effect on dynamic stability, critical acceleration and sliding displacement of high rock-fill dams subjected to strong ground motion. The traditional approaches tend to provide unconservative estimates of sliding displacement for high rock-fill dams.
机译：通过评估地震引起的滑动位移可以有效地研究高岩石堆石坝在地震条件下的行为，而滑动位移是最近性能设计方法中的关键参数。在Newmark滑动方法中确定临界加速度的常规方法基于伪静态稳定性分析，该分析使用水平惯性力或水平惯性力和垂直惯性力的组合（具有固定比例（例如2/3或1 / 2）对前者并假定是静态力，则向上或向下作用。此外，忽略了垂直加速度的放大和不均匀的影响。通过扩展Newmark早先提出的滑动体方法，研究了在水平和垂直地震联合加速度作用下的高堆石坝的抗震性能。时程垂直加速度用于动态稳定性分析和临界加速度确定的每个步骤。结果表明，时程垂直加速度对强烈地震动作用下高堆石坝的动力稳定性，临界加速度和滑动位移有显着影响。传统方法往往无法为高堆石坝提供滑动位移的保守估计。

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