In order to investigate the damage of subgrade engineering in Wenchuan Region, characteristics and the damage law of retaining wall in the rock foundamation of the high intensity area are summarized, the dynamic response of different height retaining wall on rocky site under different hierarchical earthquake is analyzed using in the way of the numerical finite difference method combining the calibration model of the shaking table model test indoor, the variation law of the earthquake earth pressure with the earthquake magnitude and retaining height is obtained, supplements and discusses the details of current seismic code is discussed. The results show that the seismic earth pressure of retaining wall whose height is bellow 12 min Ⅹ degree area(above 0.6g) in creases linearly compared with Ⅸ degree area, the code of the static method and technical framework used in current highway and railway in seismic design can be extended to Ⅹ degree intensity areas,and the retaining wall's structural resonant destruction is the main reason of the damage of high wall in the seismic according to its own structure modal analysis.%通过汶川震区路基工程震害调研,初步概括了高烈度区岩质地基挡墙的破坏规律及特性.结合室内振动台模型试验的校正模型,运用有限差分法数值计算,分析了不同高度岩基挡墙在不同量级地震作用下的动力响应,得到了地震土压力随地震量级、挡墙高度的变化规律,对现行抗震规范的可细化之处进行了补充和讨论.分析结果表明,墙高＜12 m挡墙在X度烈度区(＞0.6g)的地震土压力较之Ⅸ度烈度区呈线性增长关系,现行公路、铁路抗震设计规范所采用的拟静力法技术框架可以继续扩展到X度烈度区使用;挡墙自身结构特征的模态分析表明,挡墙自身的结构共振破坏是高挡墙震害的重要原因.
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