高速铁路桥梁徐变上拱及墩台沉降监测与分析

发布时间：2018-03-12 23:27

本文选题：高速铁路　切入点：静力水准　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：高速铁路普遍采用高架桥梁,桥梁结构在活载作用下的弹性变形和恒载作用下的长期变形都会直接影响到桥上轨道结构的受力、平顺性及行车安全。由于无砟轨道扣件调节量有限,需要严格控制工后桥梁残余徐变和墩(台)沉降的发展,而严密、准确的变形监测是实现这一目标、确保高速铁路安全运营的前提条件。本文以铁道部科技研究开发计划重点课题“艰险山区高速铁路线下工程变形远程自动化综合监测系统研究(合同编号：2010G018-E-3)’’为依托,主要工作和成果如下： (1)广泛收集国内外高速铁路桥梁徐变研究资料,对其机理、本质进行分析,探讨了国内外规范对徐变变形的计算方法；总结了桥梁桩基沉降计算方法；归纳了目前桥梁监测常规方法,着重对静力水准系统在国内外的应用进行了经验总结。 (2)以杭甬客运专线上虞特大桥和曹娥江特大桥为工程背景,选择典型孔跨,设计了试验工点的静力水准系统测试方案。利用该系统对高速铁路桥梁徐变上拱和墩台沉降进行长期自动化监测,获得了架梁后跨中竖向位移及墩(台)沉降随时间的发展规律,以及各典型时间点各测点相对竖向位移沿纵向分布曲线；对比分析了两工点工后残余徐变和墩台沉降发展状况并与相关规范限值作出比较,结果满足规范要求；分析并总结了本次静力水准系统应用情况,提出了可供类似工程借鉴的建议。 (3)运用Midas/Civil软件,对高速铁路简支箱梁建立整体模型,根据试验工点实际工况模拟不同施工阶段,探讨其徐变发展趋势。分别采用国内外三种规范的徐变模式计算梁体跨中截面徐变变形随时间发展情况,将计算值与静力水准系统实测值进行对比,确定合理计算模型,并根据此模型对桥梁长期徐变变形进行预测。 (4)运用ABAQUS有限元软件,建立试验工点典型桥墩桩基础分析模型,根据实际工况进行施工阶段划分,计算了桩基沉降随时间发展情况,并将其与现场实测值进行比较,预测了桩基沉降长期发展情况。图62幅,表20个,参考文献102篇。
[Abstract]:Abstract: elevated bridges are widely used in high speed railway. The elastic deformation of bridge structure under the action of live load and the long-term deformation under dead load will directly affect the force of the track structure on the bridge. Due to the limited adjustment of ballastless track fasteners, it is necessary to strictly control the development of residual creep and pier (platform) settlement after construction, and strict and accurate deformation monitoring is to achieve this goal. The precondition of ensuring the safe operation of high-speed railway. This paper is based on the research and development project of Ministry of Railways, "Research on the remote automatic Monitoring system of Engineering deformation under the High Speed Railway Line in the difficult and dangerous Mountain area" (contract No.: 2010G018-E-3). The main work and results are as follows:. 1) collecting abroad and domestic high speed railway bridge creep research data, analyzing its mechanism and essence, discussing the calculation method of creep deformation in domestic and foreign codes, summarizing the calculation method of bridge pile foundation settlement; The conventional methods of bridge monitoring are summarized, and the application of static leveling system at home and abroad is summarized. Taking Shangyu Bridge and Cao'e River Bridge of Hangzhou-Ningbo passenger dedicated Line as the engineering background, the typical hole span is selected. The test scheme of static leveling system of test site is designed, which can be used to automate the long-term monitoring of creep uparch and abutment settlement of high-speed railway bridge. The development law of vertical displacement and pier (abutment) settlement along with time and the relative vertical displacement distribution curve of each measuring point at each typical time point are obtained. The development of residual creep and pier and abutment settlement after two works are compared and compared with the limit values of relevant codes, the results meet the requirements of the code, and the application of the static leveling system is analyzed and summarized. Some suggestions for similar projects are put forward. (3) using Midas/Civil software, the integral model of simply supported box girder of high-speed railway is established, and the different construction stages are simulated according to the actual working conditions of the test site. The creep development trend is discussed. The creep deformation of the mid-span section of beam body is calculated with three creep modes at home and abroad, and the calculated values are compared with the measured values of the static leveling system, and the reasonable calculation model is determined. According to this model, the long-term creep deformation of the bridge is predicted. Using ABAQUS finite element software, the model of pile foundation analysis of typical bridge piers in test site is established. According to the actual working conditions, the construction stages are divided, and the settlement of pile foundation with time development is calculated, and the results are compared with the field measured values. The long-term development of pile foundation settlement is forecasted. 62 figures, 20 tables and 102 refs.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U446

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