铁路隧道下穿连续刚构桥墩施工影响及防控措施研究

发布时间：2018-03-20 22:11

本文选题：铁路隧道　切入点：预应力锚索框架梁　出处：《铁道科学与工程学报》2017年11期 　论文类型：期刊论文

【摘要】：以米易至攀枝花扩能改建工程垭口隧道下穿京昆高速公路段城门洞大桥为例,研究垭口隧道施工对其上部边坡、城门洞大桥右线4号墩和左线5号墩相互影响规律,并结合现场施工中所使用的预应力锚索框架梁,综合现场监控量测数据和数值分析结果对其加固效果进行研究,最后对垭口安全性进行评价。研究结果表明:随着垭口隧道开挖,上部边坡的安全系数降低明显,引起了桥墩的沉降和横向偏移,且沉降大小远大于横向偏移;施作锚索框架梁后,上部边坡的安全系数升高显著,垭口隧道施工对上部边坡的影响明显减小,且锚索框架梁施做后能较好的控制桥墩横向偏移,对桥墩沉降控制不佳。
[Abstract]:Taking the Chengmendong Bridge under Yakou Tunnel under the Beijing-Kunming Expressway Section of Miyi to Panzhihua capacity expansion Project as an example, the interaction between Yakou tunnel construction and its upper slope, the fourth pier on the right line of Chengmendong Bridge and the fifth pier on the left line are studied. Combined with the prestressed anchor cable frame beam used in the field construction, the reinforcement effect is studied by synthesizing the field monitoring data and numerical analysis results. Finally, the safety of Yakou is evaluated. The results show that with the excavation of Yakou tunnel, the safety factor of the upper slope decreases obviously, which causes the settlement and lateral migration of the pier, and the settlement is much larger than the lateral migration. The safety factor of the upper slope increases significantly after the construction of the Anchorage cable frame beam, and the influence of the construction of the Yakou tunnel on the upper slope is obviously reduced, and the lateral deviation of the pier can be better controlled by the construction of the Anchorage cable frame beam, and the settlement of the pier is not well controlled.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51678498) 中央高校基本科研业务费专项资金资助项目(SWJTU11ZT33) 交通运输部西部科技资助项目(2013318J13340) 教育部创新团队发展计划资助项目(IRT0955)
【分类号】：U456.3

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