铁路隧道近距离侧穿高速公路桥桩位移变形控制研究

Study on Displacement Deformation Control of Bridge Pile of Railway Tunnel Side-crossing Expressway at Close Distance

随着我国轨道交通行业建设规模的迅猛扩张,铁路隧道近距离侧穿既有建(构)筑物越来越普遍。在铁路隧道开挖过程中,保证对既有建(构)筑物的安全和变形控制至关重要。文章以新建成达万高速铁路工农村3号隧道侧穿高速公路桥梁桩基为依托工程,采用数值模拟研究了不设置隔离防护措施和设置隔离防护措施两种情况下铁路隧道侧穿高速公路桥桩引起的桥桩位移变形。研究结果表明,采取隔离桩防护措施后对桥桩的水平位移变形有一定的改善作用,能减少隧道施工对桥桩的影响。

With the rapid expansion of the construction scale of China's rail transit industry,it is more and more common for railway tunnels to pass through existing buildings(structures)at close range.In the process of railway tunnel excavation,it is very important to ensure the safety and deformation control of existing buildings(structures).Based on the bridge pile foundation of the newly built No.3 tunnel in the rural area of Dawan highspeed railway,this paper uses numerical simulation to study the displacement deformation of the bridge pile caused by the railway tunnel side-crossing the highway bridge pile under the two conditions of no isolation protection measures and isolation protection measures.The results show that the horizontal displacement deformation of the bridge pile can be improved after the isolation pile protection measures are taken,and the influence of tunnel construction on the bridge pile can be reduced.