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基于自行设计的桩-土动力相互作用模型试验装置,对2根承力盘位置不同的模型支盘桩施加强烈水平振动荷载,采用数字式变频仪控制荷载频率,通过不同弹簧的刚度系数实现不同大小的荷载级别,分析不同激振频率和激振荷载作用下桩身弯矩变化趋势及桩侧土压力变化状况。试验表明:随着激振频率的增大,支盘桩的动力响应在整体上有减小的趋势且水平动承载力有所提高;随着激振荷载的增大,支盘桩的动力响应随深度增加逐渐减小,反弯点位置逐渐下移,桩身的最大动弯矩发生在距桩顶1/3左右深度处。承力盘的设置改变了桩身的变形和受力状态,能够提高桩身平衡弯矩的能力,是对桩基的结构优化设计,且承力盘设置在桩身靠上有利于水平动承载力的提高。
Based on the self-designed test device of pile-soil dynamic interaction model, a strong horizontal vibration load is applied to two model branch pile with different bearing positions. The digital frequency converter is used to control the load frequency and different stiffness coefficients of different springs Size of the load level, analysis of different excitation frequency and excitation load changes in the bending moment of pile and earth pressure on the pile side changes. The experimental results show that with the increase of excitation frequency, the dynamic response of branch pile has a decreasing tendency and the horizontal dynamic bearing capacity increases. With the increase of excitation load, the dynamic response of branch pile As the depth increases, the position of the buckling point gradually decreases and the maximum dynamic bending moment of the pile body occurs at a depth of about 1/3 of the top of the pile. The setting of the bearing plate has changed the deformation and stress state of the pile body, which can improve the ability of the pile body to balance the bending moment. It is the structural optimization design of the pile foundation and the bearing plate is arranged on the pile body to facilitate the horizontal dynamic bearing Improve the power.