新建连镇铁路施工对邻近沪宁城际铁路的影响

Impact of Newly⁃built Lianyungang-Zhenjiang Railway Construction on Adjacent Shanghai-Nanjing Intercity Railway

针对长期运营中新旧路基差异性沉降、路基结构稳定性破坏等危及线路运营安全的问题,采用自动光纤光栅监测系统对新建连镇(连云港—镇江)铁路接轨沪宁(上海—南京)城际铁路工程进行了长期变形及内力监测,对不同深度处的地层沉降及桩板结构内力进行了分析。结果表明:新建线路上部列车荷载持续作用下,各地层沉降总体呈现上部大下部小的规律;初期筏板轴力基本稳定,进入正式运营期后,轴力先减小后增大;桩底轴力逐渐增大后达到稳定,桩顶轴力先增大后减小。

In view of the problems endangering the operation safety of the railway line during the long-term operation,such as the differential settlement of the new and existed subgrades,the stability destruction of the subgrade structure,etc.In this paper,the long-term deformation and internal force of the newly-built Lianyungang-Zhenjiang railway connecting Shanghai-Nanjing intercity railway project were monitored by using the automatic fiber grating monitoring system,and the ground settlement at different depths and the internal force of the pile-raft structure were analyzed.The results show that under the continuous action of the train load on the upper part of the new railway,the settlement of each layer is generally large in the upper part and small in the lower part.In the initial stage,the axial force of raft is basically stable.After entering the formal operation period,the axial force decreases first and then increases.The axial force at the pile bottom increases gradually and then reaches stability,and the axial force at the pile top increases first and then decreases.