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桩板结构路基是高速铁路无碴轨道的一种新的路基结构形式,基于Bockinghamπ定理,采用量纲分析方法,确定了桩板结构路基模型的动力相似常数,通过室内大比例动态模型试验研究,分析了在循环加载的条件下浸水前、后桩板结构路基的动态力学特性。试验结果表明,路基动应力沿深度逐渐衰减,激振频率对动应力的影响不太明显;路基边坡浸水后,在相同加载频率下,动应力比浸水前略有增大;桩基加深了路基的动力影响范围,改善了路基土体部分的受力状态;桩底持力层受动力影响较大,是动力设计的关键环节之一。
The pile foundation is a new subgrade structure of ballastless track on high-speed railway. Based on Bockingham’s theorem, the dynamic similarity constants of the subgrade model of pile-pile structure are determined by the dimensional analysis method. Through large-scale indoor dynamic model test, The dynamic mechanical characteristics of the pile-structure embankment before and after soaking under cyclic loading were analyzed. The experimental results show that the dynamic stress of subgrade gradually attenuates along the depth and the influence of excitation frequency on dynamic stress is not obvious. Under the same loading frequency, the dynamic stress of subgrade slope slightly increases compared with that before water immersion; Of the dynamic range of influence, improve the subgrade soil subgrade part of the state of force; pile bearing force by the greater impact of dynamic design is one of the key areas.