高速铁路路基桩板结构差异沉降限值探讨

桩板结构属于超静定结构,各桩之间的差异沉降会引起显著的结构内力,把空间结构近似简化成平面结构,采用结构力学分析方法,分别对5 mm和2 mm的差异沉降进行内力计算。计算过程中综合考虑温度变化,混凝土收缩徐变,列车动力作用,不同桩位发生支座下沉,采用6种工况组合分别计算,得出不同差异沉降对结构内力的影响。

Approach to Differential Settlement Limit Value of High-speed Railway Subgrade Pile-plank Structure

Subgrade pile-plank structure belongs to hype static structure,and the differential settlement between piles will cause significant structural internal force. By means of structure simplification,the space structure can be approximately simplified into a plane structure. With structural mechanics analysis,the internal forces in 5 mm and 2 mm differential settlement are calculated respectively.Considering the temperature variation,shrinkage and creep of concrete,train dynamic action and support displacement of different piles related to calculation,the influences of various differential settlements on the structural internal forces are calculated respectively with respect to 6 kinds of working conditions。