铁路隧道仰拱及仰拱填充层动力响应分析

发布时间：2018-03-12 17:10

本文选题：仰拱及仰拱填充层　切入点：动应力　出处：《中国铁道科学》2016年03期 　论文类型：期刊论文

【摘要】：为研究铁路隧道仰拱及仰拱填充层的动力响应,对兰新第2双线福川铁路隧道进行现场测试,分析在不同运行速度列车的动荷载作用下,不同道床板下埋深处仰拱及仰拱填充层的动应力响应和竖向振动加速度响应分布规律,并与数值模拟结果进行对比分析。结果表明:模拟得到道床板下不同深度处仰拱及仰拱填充层的动应力、竖向振动加速度的波动幅度和频率与实测结果基本吻合;仰拱及仰拱填充层是承载动应力的主要载体;列车运行速度一定时,仰拱及仰拱填充层的动应力和竖向振动加速度响应均随着道床板下深度的增加而减小;同一道床板下深度处仰拱及仰拱填充层的动应力和竖向振动加速度响应均随着列车运行速度的降低而减小;仰拱及仰拱填充层的混凝土强度增加其动应力衰减幅度减小,但减小幅度相对有限,应综合考虑动应力响应和经济因素,选取合适的仰拱及仰拱填充层的混凝土强度。
[Abstract]:In order to study the dynamic response of the inverted arch and the infilled layer of the inverted arch of the railway tunnel, the field test of the double track Fuchuan railway tunnel of Lanxin No. 2 was carried out, and the dynamic load of the train with different running speeds was analyzed. The distribution of dynamic stress response and vertical vibration acceleration response of the inverted arch and the infill layer of the inverted arch at the depth under the different bed slab is studied. The results show that the dynamic stress of the inverted arch and the filling layer of the inverted arch at different depths under the pavement slab are obtained by the simulation, and the amplitude and frequency of the vertical vibration acceleration are in good agreement with the measured results. The dynamic stress and the vertical vibration acceleration response of the inverted arch and the inverted arch filling layer are decreased with the increase of the depth under the track bed when the train running speed is constant and the dynamic stress and the vertical vibration acceleration response of the inverted arch and the inverted arch filling layer are the main carriers to carry the dynamic stress and the vertical vibration acceleration with the increase of the running speed of the train. The dynamic stress and vertical vibration acceleration response of the inverted arch and its filling layer at the depth of the same bed plate decrease with the decrease of train speed, and the attenuation amplitude of dynamic stress decreases with the increase of the concrete strength of the inverted arch and inverted arch fill layer. However, the reduction range is relatively limited, so the dynamic stress response and economic factors should be considered synthetically, and the concrete strength of the inverted arch and the inverted arch filled layer should be selected.
【作者单位】：北京交通大学隧道及地下工程教育部工程研究中心;青岛理工大学土木工程学院;
【基金】：国家自然科学基金重点项目资助(U1234210)
【分类号】：U451;U456.3

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