新建桥梁对运营高铁基础变位的影响研究

发布时间：2018-06-13 23:24

本文选题：高速铁路 + 基础变位　；参考：《铁道工程学报》2017年07期

【摘要】：研究目的:在高铁桥梁下新建桥梁工程,既要保证新建工程的安全,也要确保因桩基施工与运营引起的高铁基础变位稳定在合理的范围。高速铁路轨道具有高平顺性的特点,其基础变位的限值相较于一般桥梁更为严苛。本文针对哈尔滨-大连铁路客运专线下新建立交匝道桥工程,采用有限差分软件对新建工程影响下的高铁基础变位进行数值模拟,以相关规范为标准,对新建工程对高铁基础变位的影响进行安全评估,并在原方案的基础上进一步分析新建桩基的近接距离与施工顺序对结果的影响。研究结论:(1)原方案中,在下穿区域与新建桩基距离最近的439号墩受影响最大,相邻的438号墩次之,此相邻两墩的基础变位类型均符合《高速铁路设计规范》与《高速铁路无砟轨道线路维修规则(试行)》的要求;(2)不同近接距离对高铁变位影响较大,近接距离越小,高铁基础变位越大,建议新建桩基与高铁基础承台的最小水平距离不低于新桩桩径的3倍;(3)不同施工顺序对高铁变位影响较小,但为了减小施工对高铁运营产生的影响,建议采用跳挖法进行桩基施工;(4)本研究结论可为新建桥梁下穿运营高铁的方案设计提供借鉴和参考。
[Abstract]:The purpose of this paper is to ensure the safety of the new construction and the stability of the high speed railway foundation displacement caused by the construction and operation of the pile foundation. High speed railway track is characterized by high ride comfort, and the limit value of foundation displacement is more severe than that of common bridges. In this paper, according to the new ramp and bridge project of Harbin-Dalian railway passenger dedicated line, the finite difference software is used to simulate the displacement of high-speed railway foundation under the influence of the new construction project, and the relevant code is taken as the standard. The influence of the new construction on the displacement of the high-speed railway foundation is evaluated, and the influence of the close connection distance of the new pile foundation and the construction sequence on the result is further analyzed on the basis of the original plan. In the original scheme, pier 439, which has the closest distance from the new pile foundation, is the most affected in the original scheme, followed by the adjacent pier 438. The two adjacent piers' basic displacement types meet the requirements of "Design Code for High Speed Railway" and "maintenance rules for Ballastless track of High-speed Railway (try out)".) the close connection distance has a greater influence on the displacement of high-speed railway, and the closer the distance is, the smaller the close connection distance is. The greater the displacement of high-speed railway foundation, the smaller the minimum horizontal distance between the new pile foundation and the cap of the high-speed railway foundation is not less than 3 times of the new pile diameter.) the different construction sequence has less influence on the high-speed railway displacement, but in order to reduce the impact of the construction on the operation of the high-speed railway, It is suggested that the jump excavation method should be used for pile foundation construction. The conclusion of this study can be used for reference and reference for the scheme design of high-speed railway under the new bridge.
【作者单位】：石家庄铁道大学;
【分类号】：U213.1;U445

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