高速铁路无砟轨道桩板结构路基动力特性研究
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摘要
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。
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%.
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%.
引文
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[2]高飞,孙小刚.上海地区场地剪切波速的特征分析[J].上海地质,2005(2):27-29.
[3]顾宝何,张大钊,朱小林,等.GB50021—2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2009.
[4]房营光.岩土介质与结构动力相互作用那个理论及其应用[M].北京:科学出版社,2005.
[5]冯志仁.最大剪切模量对土动力参数及地震反应的影响[J].自然灾害学报,2007(6):90-95.
[6]唐第甲,苏谦.桩板结构路基自振频率研究[J].四川建筑,2010(2):69-70.
[7]詹永祥,蒋关鲁,胡安华,等.遂渝线无砟轨道桩板结构路基动力响应现场试验研究[J].岩土力学,2009(3):833-835.
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