This study aimed to illustrate the seismic performances of anti-slide pile-reinforced bridge foundations in landslides. Based on the anti-slide reinforcement project at Yousuotun along the Chengdu-Lanzhou high-speed railway under construction, shaking table tests were performed on a double-row anti-slide pile-reinforced bridge foundation and landslide model with a 1:40 similitude ratio. Given that the similitude law was satisfied, seismic waves with different frequencies and acceleration amplitudes were input as base excitations to monitor the responses of dynamic parameters: slope acceleration, earth pressure, and pile strain. The amplification effect of peak ground acceleration (PGA) was analyzed. The landslide thrust distribution characteristics and slope response processes were further studied to verify the seismic design of such bridge foundations in landslide-prone areas. The response acceleration of the slope subjected to seismic loads showed a nonlinear amplification “elevation effect”, “surface effect”, and “geological structure effect”. When the distance between the bridge foundation and the back-row anti-slide pile was small, the pier maintained a relatively large PGA amplification factor and was subjected to strong seismic loads. The landslide thrust was mainly borne by the upper part of the back-row anti-slide piles as its distribution changed from spoon-shaped to bow-shaped. Under high-intensity earthquake events, the load-bearing section of the bridge foundation should be strengthened at the sliding surface. Anti-slide piles can effectively limit the dynamic response of the landslide and weaken the seismic response of the slope. The results of testing this reinforcement are the first results proving that the seismic design of reinforced bridge foundations with anti-slide piles can be reliable.

中文翻译：

---

抗滑桩桥梁桩基边坡抗震性能的大型振动台模型试验：一个案例研究

这项研究旨在说明抗滑桩加固的桥梁基础在滑坡中的抗震性能。基于正在建设中的成兰高铁右所屯的抗滑加固工程，对双排抗滑桩加筋桥梁基础和滑坡模型进行了振动台试验，模拟比例为1:40。 。在满足相似律的前提下，输入不同频率和加速度振幅的地震波作为基础激励，以监测动态参数的响应：坡度加速度，土压力和桩应变。分析了峰值地面加速度（PGA）的放大效果。进一步研究了滑坡推力分布特征和边坡响应过程，以验证这种滑坡易发地区桥梁基础的抗震设计。地震荷载作用下边坡的响应加速度呈现出非线性放大“高程效应”，“地表效应”和“地质构造效应”。当桥基与后排抗滑桩之间的距离较小时，桥墩保持相对较大的PGA放大系数，并承受强烈的地震荷载。滑坡推力主要由后排抗滑桩的上部承担，其分布形式从勺形变为弓形。在高强度地震事件下，应在滑动面上加强桥梁基础的承重部分。抗滑桩可以有效地限制滑坡的动力响应，削弱边坡的地震响应。测试该钢筋的结果是第一个证明抗滑桩的钢筋桥基础抗震设计可靠的结果。