城市道路下穿高速铁路的关键技术研究

Research on Key Technologies of Urban Road underneath High-Speed Railway

随着国民经济的快速发展,新建或改建城市道路越来越多需下穿高速铁路桥梁,下穿方案是否合理往往成为项目实施的关键因素。以太仓市某城市主干路为例,研究设计、施工及运营全过程阶段对高速铁路的影响,采用ABAQUS有限元软件分别模拟道路施工开挖、工后沉降及碰撞工况对高铁桥墩的影响。计算结果显示,采用轻质路基换填处置,高铁桥墩墩顶最大位移满足小于1 mm的技术要求,汽车撞击下墩身混凝土偏心压应力σ_(max)及偏心距e/s验算通过;还进一步研究施工措施和高铁监测方案,保证高铁运营安全。

With the rapid development of national economy,more&more new or reconstructed urban roads need to underneath high-speed railway bridges.Whether the underneath scheme is reasonable or not often becomes the key factor in the implementation of the project.Taking an urban trunk road in Taicang as an example,it studies the impact of the whole process of design,construction&operation on high-speed railway,and uses ABAQUS finite element software to simulate the impact of road construction excavation,post construction settlement&collision conditions on high-speed railway piers.The calculation results show that the maximum displacement of the pier top of the high-speed railway pier can meet the technical requirements of less than 1 mm by using the light subgrade replacement treatment,and the eccentric compressive stress of the pier concrete under the impact of the vehicleσmax and eccentricity e/s pass the checking calculation;the construction measures and high-speed railway monitoring scheme are further studied to ensure the safety of high-speed railway operation.