| 近距离上层隧道施工对下层隧道的扰动影响 |
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| 引用本文： | 唐强森,刘涛.近距离上层隧道施工对下层隧道的扰动影响[J].西北地震学报,2018,40(3):591-596,603. |
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| 作者姓名： | 唐强森 刘涛 |
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| 作者单位： | 内江职业技术学院建筑工程系 |
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| 基金项目： | 四川省教育厅项目(18ZB0329) |
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| 摘 要： | 针对近距离上层隧道施工时给下层隧道稳定性造成扰动影响的现状,基于简支土体梁力学模型,研究下层隧道顶部在周期性扰动力作用下的系统振动特性,得到顶部垂直位移的动态响应数学表达式,为定量掌握最大位移峰值的大小与出现时刻提供理论依据,指出考虑振动因素时上下层隧道安全距离的确定方法。结合具体算例探索扰动力等因素对最大位移的作用规律,结果表明:扰动力振幅和隧道跨度分别增加1倍和2倍时,最大位移峰值相应增大1倍和23.9倍;隧道层间垂距和土体弹性模量分别增加2倍和3倍时,最大位移峰值相应减小88.2%和70%。当主要影响因素变化时,最大位移的波动大周期延长、波动震荡性加剧,特别是峰值处的震荡幅值增大,隧道顶部稳定性受到明显影响。
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| 关 键 词： | 近距离隧道 扰动力 位移动态响应 影响因素 |
| 收稿时间： | 2017/8/20 0:00:00 |
Influence of Construction Disturbance from Close Upper Tunnel on Lower Tunnel |
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| TANG Qiangsen and LIU Tao.Influence of Construction Disturbance from Close Upper Tunnel on Lower Tunnel[J].Northwestern Seismological Journal,2018,40(3):591-596,603. |
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| Authors: | TANG Qiangsen and LIU Tao |
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| Institution: | Department of Civil Engineering, Neijiang Vocational and Technical College, Neijiang 641000, Sichuan, China and Department of Civil Engineering, Neijiang Vocational and Technical College, Neijiang 641000, Sichuan, China |
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| Abstract: | Based on the mechanical model of a simply supported beam, this study investigates the influence of periodic construction disturbances from a close upper tunnel on the vibration characteristics of the roof of a lower tunnel. The mathematical expression for the dynamic response of vertical displacement at the top of lower tunnel is deduced. The mathematical expression can provide a theoretical basis for determining the occurrence time and peak displacement, and provide a method for determining the safe distance between the two tunnels. The law of the action of influencing factors such as the disturbance force on maximum displacement is explored with a specific example. The results show that when the disturbance amplitude and the tunnel span increase by 1 and 2 orders of magnitude, respectively, the corresponding peak displacements increases by 1 and 23.9 orders, respectively and when the vertical distance between tunnel layers and the elastic modulus of soil increase by 2 and 3 orders, respectively, the corresponding peak displacements reduces by 88.2% and 70%, respectively. When the main affecting factors change, the maximum displacement and its oscillations increase, which influences the top stability of the tunnel. |
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| Keywords: | close tunnel disturbance force dynamic response of displacement affecting factor |
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