基于振动台试验的桩板墙加固边坡抗震性能研究

以大型振动台模型试验为手段，以昆明市某边坡为原型，对地震作用下桩板式抗滑挡墙加固边坡的加速度、位移和动土压力响应的分布特征和变化规律进行研究。以大瑞人工波为研究对象输入地震波，设计相似比为1∶20的桩板墙加固边坡模型与自然边坡开展对比实验。研究表明：自然边坡在Ⅷ级地震烈度下，边坡体后缘产生大量张拉裂隙，后缘与母体脱空，具备滑坡的前兆特征，与自然边坡试验现象比较，桩板墙加固边坡的抗震稳定性较好，边坡在设防烈度（Ⅷ基本烈度）范围内保持稳定；当加载地震波峰值加速度相对较小时，水平加速度延高程有明显放大效应，会对自然边坡稳定性产生不利影响；当加速度相对较大时，有水平加速度延高程既出现放大现象也产生缩小现象；桩板墙加固后边坡对地震波的放大效应明显比自然边坡土体小，说明桩板墙能有效减弱边坡的震动效应；在地震动激励下，动土压力峰值随着加载地震波幅值的增大而增大，在同一加载工况下，离桩顶越远，动土压力峰值越大，桩板墙最大土压力出现在靠近桩板墙底的位置。试验结果有助于揭示该结构抗震机制，可为支挡结构的选取与桩板墙结构抗震设计提供依据。

Research on Seismic Performance of Pile-plate Wall Reinforced Slope Based on Shaking Table Test

In relation ti a slope in Kunming city with a large-scale shaking table model test to study, the distribution and variation of acceleration, displacement and earth pressure response of the slope strengthened by pile-plate anti-sliding retaining wall under earthquake action are studied, Taking Darui artificial wave as the research object, a pile-plate wall reinforced slope model with a similarity ratio of 1∶20 was designed to carry out a comparative experiment with the natural slope. The results show that under the earthquake intensity of Ⅷ, a large number of tension cracks will be formed on the tailing edge of the natural slope. And the tailing edge will be empty from the slope body, which has the precursory characteristics of landslides. Compared with the natural slope, the pile-plate wall reinforced slope has a higher seismic stability in the range of the fortification intensity (Ⅷ basic intensity). If the peak acceleration of the inputted seismic wave is relatively small, the horizontal acceleration has a significant amplification effect along height, which brings negative impact on the seismic stability of the natural slope. When the acceleration is relatively large, the horizontal acceleration is both enlarged and reduced along different height. It can be seen that the amplification effect of seismic wave on the pile-plate wall reinforced slope is obviously smaller than the natural slope, indicating that the plate wall can effectively reduce the vibration effect on the slope. Under the dynamic excitation of earthquake, the peak value of dynamic earth pressure increases with the increase of the amplitude of the loaded seismic wave. Under the same loading condition, the farther away from the pile top, the greater the peak value of dynamic soil pressure, and the maximum soil pressure is located near the bottom of the pile-plate wall. The experimental results reveal the seismic mechanism of the structure and also provides basis for the selection of support structures and the seismic design of pile-plate wall structures.