边坡桥梁桩基大型振动台模型试验研究

通过大型振动台试验,研究地震荷载作用下某铁路线上一代表性的陡坡地段抗滑桩支护桥梁桩基结构体系的抗震性能。模型与原型按照尺寸相似比1:40进行模型试验相似设计。模型试验通过输入的正弦波和汶川波的测试结果分析边坡模型地震作用规律。结果发现:桥梁桩和抗滑桩桩间土压力呈三角形分布,抗滑桩后土压力呈"R"形分布;边坡对监测点加速度有放大效应;位移随地震荷载增加而增大。抗滑桩的各种响应强度均大于桥梁桩基,说明抗滑桩对桥梁桩基有很好的支护作用。试验研究为边坡抗滑桩-桥梁桩基新结构抗震设计奠定了良好的基础。

Large scale shaking table model test study on Bridge Pile Foundation of Slope

The seismic performance of the bridge pile structure system supported by anti-slide pile in a representative steep slope section of a railway line is studied by means of large shaking table test. The sizes of the model and prototype slope are designed by using the similar principle with a scale factor of 1 ∶ 40. The test results of the sine wave and Wenchuan wave are used to analyze the seismic law of the slope model. The results show that the soil pressure between bridge pile and anti-slide pile is distributed triangularly,the anti-slide pile soil pressure is distributed in the form of "R"; the slope has amplification effect on the acceleration of monitoring points; the displacement increases with the increase of seismic load. The response strengths of the anti-slide pile are greater than those of the bridge pile,indicating that the anti-slide pile has a good supporting effect on the bridge pile foundation. The research provides a good foundation for seismic design of the new structure with slope anti-slide pile and bridge pile foundation.