新建高速公路下穿高速铁路桥梁的影响性分析

Influence analysis of newly built expressway under high-speed railway bridge

为研究新建高速公路下穿高铁桥梁的影响性分析,结合某实际工程背景,采用有限元模拟的计算手段,分析了新建高速公路施工过程、运营过程对高铁桥墩基础的位移及桩基础承载力的影响。计算结果表明:采用桥梁结构形式下穿高速铁路桥梁时,新建高速公路的施工、运营对既有高铁桥梁的墩顶位移、沉降有一定的影响,但影响均在允许范围之内;同时由于施工过程的土体侧向挤出及重分布效应,对高铁桥梁的桩基承载力有一定的影响,但桩基承载力的变化未超出允许范围。

In order to study the influence analysis of the newly built expressway under the high-speed railway bridge,combined with an actual engineering background,the calculation method of finite element simulation was used to analyze the impact of the construction process and operation process of the new expressway on the displacement of the high-speed railway bridge pier foundation and the bearing capacity of the pile foundation.influence.The calculation results show that when the bridge structure is used to cross the high-speed railway bridge,the construction and operation of the new expressway will have a certain impact on the pier top displacement and settlement of the existing high-speed railway bridge,but the impact is within the allowable range;The lateral extrusion and redistribution effects of the soil in the process have a certain influence on the bearing capacity of the pile foundation of the high-speed railway bridge,but the change of the bearing capacity of the pile foundation does not exceed the allowable range.