温州市某铁路与堤坝交叉段施工期安全性分析

Safety Analysis of Intersection between Railway and Dam during Construction Period

鉴于铁路与堤坝交叉段施工期安全性分析是铁路和堤坝设计、施工的重要环节,采用有限元分析方法开展温州市铁路S1线跨堤桥梁段和温州灵昆南堤坝交叉段施工期变形、内力计算及安全性分析。结果表明,采用先堤后桥方案,施工完成时桥梁桩基的最大沉降、堤坝的最大水平向位移均满足要求,同时桥梁对堤防整体应力的影响远小于堤坝自重对自身的影响。此外,为减少堤坝施工对桥墩内力的影响并降低堤坝最终沉降量,应对堤坝结构地基(与桥墩交叉部位)采用扩大水泥搅拌桩处理范围、减小桩间距等加固措施。

Safety analysis of intersection between the railway and dam during construction period plays an important role in both design and construction.In this paper,finite element analysis is applied for calculation of the deformation and stress in the intersection between the bridge section of railway S1 and Lingkun South Dam in Wenzhou City during the construction period,as well as safety analysis.The result indicates that both the maximum settlement of bridge pile foundation and the maximum horizontal displacement of dam satisfy the demand of the code when it is prior to complete the construction of the dam.Meanwhile,the result also shows the influence of the bridge which was former constructed on the stress in dam is much less than which introduced by the weight of the dam itself.Besides,in order to reduce the influence of the dam construction on stress bridge foundation and the final settlement of the dam,further reinforcement measures need to be deployed in the foundation of the intersection between railway and dam.