Topography effects on the vertical vibration responses of pile group are revealed though numerical analysis and model tests. First, a series of model tests with different topography of ground and bedrock are conducted. The results indicate that displacement amplitude of the pile head in sloping ground topography is larger than in horizontal ground. Differential displacement at various positions of the pile cap is observed in non-horizontal topography. Afterwards, a numerical algorithm is employed to further explore the essential response characteristics in group piles of different topography configurations, which has been verified by the test results. The lengths of the exposed and frictional segment, together with the thickness of the subsoil layer, are the dominant factors which cause non-axisymmetric vibration at the pile cap.

通过数值分析和模型试验，揭示了地形对桩群竖向振动响应的影响。首先，进行了一系列具有不同地面和基岩地形的模型测试。结果表明，在倾斜的地面地形中桩头的位移幅度大于在水平地面中的位移。在非水平地形中观察到桩帽各个位置的位移差异。之后，采用数值算法进一步探讨了不同地形配置的群桩的基本响应特性，并通过测试结果进行了验证。裸露段和摩擦段的长度以及下层土层的厚度是导致桩帽处非轴对称振动的主要因素。