高速铁路无砟轨道桩板结构路基动力特性研究

桩板结构路基是应用于高速铁路无砟轨道一种新的路基结构形式,它由上部钢筋混凝土承载板、钢筋混凝土桩基与路基本体与组成,利用板和桩-土之间的共同作用来满足无砟轨道的强度与沉降变形要求,是介于桥梁与路基之间的一种特殊结构形式,桩土相互作用非常明显。以往工程上都是利用m法处理桩土相互作用,但是对于桩板结构,实测数据表明m法已不再适用。提出了计算桩板结构动力特性一种合理模拟方法,并通过著名有限元软件ANSYS10.0进行分析。与某高速铁路桩板结构动力特性的实测数据的对比结果表明,提出的模拟方法满足一定的工程精度要求：计算值与实测值相差在10%以内。

Study on Dynamic Property of Pile-plank Embankment Used in High-speed Railway with Slab-track

Pile-plank embankment is a kind of new structure used in high-speed railway with slab-track,which is composed of the reinforced concrete slab at its upside,reinforced concrete piles and groundsill at its downside.It depends on pile-soil and plank-soil interaction to satisfy the intensity and the settlement request.It is a special kind of structure between the bridge and road-base,and the pile-soil interaction is very significant.Formerly,the ＂m＂ method was utilized to handle the pile-soil interaction in practice,but it is not applicative anymore in the pile-plank embankment according to the measured data.In this paper,a sort of reasonable numerical simulation method is put forward to get the dynamic property of pile-plate embankment,of which an analysis is made with the famous general finite element software ANSYS10.0.According to the comparative result between measured data from certain high-speed railways and the calculated data,this method is proved to be applicable in practice： the disparity between measured and calculated data is within 10%.