高速铁路隧道仰拱结构受力现场实测分析

发布时间：2018-03-06 05:11

本文选题：高速铁路　切入点：隧道　出处：《中国铁道科学》2017年05期 　论文类型：期刊论文

【摘要】：针对高速铁路隧道仰拱受力状态复杂且对高速列车行车安全至关重要的特点,现场测试兰新第二双线福川隧道返工后仰拱混凝土和钢筋的应力,分析仰拱结构中混凝土和钢筋的受力特征及应力变化规律。结果表明:受隧道二衬自重及上部围岩荷载、隧道基底围岩膨胀、轨道道床及列车荷载的作用,返工后仰拱混凝土经历了受压、出现局部拉应力、拉压应力稳定的变化过程;仰拱中混凝土和钢筋的最大拉应力均出现在仰拱中心上部,从仰拱返工到隧道运营的整个过程中,混凝土的最大拉应力为1.9MPa,最大压应力约为8MPa;地下水大量补充后,隧底围岩膨胀释放大量荷载,使得混凝土应力、钢筋应力以及土压应力迅速增大。基于监测结果及地质条件,提出将福川隧道仰拱底鼓分为轻微、中度和严重3种程度,针对每种程度的底鼓给出相应的控制措施。
[Abstract]:In view of the complex stress state of the inverted arch of the high-speed railway tunnel and its critical importance to the safety of the high-speed train, the stress of the inverted arch concrete and steel bar after the rework of the second double track Fuchuan Tunnel in Lanxin is tested on the spot. The stress characteristics and stress variation of concrete and steel bar in inverted arch structure are analyzed. The results show that the second lining of the tunnel, the load of the upper wall rock, the expansion of the surrounding rock of the base of the tunnel, the load of the track bed and the train load, After rework, the concrete of inverted arch experienced the process of compression, local tensile stress and stable tension stress, and the maximum tensile stress of concrete and steel bar in inverted arch appeared in the upper part of the center of inverted arch, from the rework of inverted arch to the operation of tunnel. The maximum tensile stress of concrete is 1.9 MPA, and the maximum compressive stress is about 8 MPA. After a large amount of groundwater is replenished, a large amount of load is released by the expansion of surrounding rock at the bottom of the tunnel, which makes the stress of concrete, the stress of reinforcing bar and the compressive stress of soil increase rapidly. Based on the monitoring results and geological conditions, The paper puts forward that the backarch bottom drum of Fuchuan tunnel can be divided into three levels: mild, moderate and serious, and the corresponding control measures for each degree are given.
【作者单位】：青岛理工大学土木工程学院;北京交通大学隧道及地下工程教育部工程研究中心;
【基金】：国家自然科学基金重点资助项目(U1234210)
【分类号】：U451

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