| 轨道平顺性与土动力特性对地铁隧道振动的影响 |
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| 引用本文： | 韦凯,翟婉明,肖军华.轨道平顺性与土动力特性对地铁隧道振动的影响[J].西南交通大学学报,2013,26(6):989-995. |
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| 作者姓名： | 韦凯 翟婉明 肖军华 |
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| 基金项目： | 国家自然科学基金青年科学基金资助项目（51008257，51008158）中国博士后科学基金特别资助项目（201104699）四川省科技支撑计划资助项目（2011GZ0088） |
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| 摘 要： | 为精确计算列车动荷载作用下软土地铁盾构隧道频域振动响应，考虑地基动刚度随应变频响的非线性变化，建立了车辆/轨道/隧道/软土地基的垂向耦合动力学模型，研究了不同轨道平顺等级下软土动刚度随应变频响非线性变化对地铁盾构隧道随机振动的影响规律.研究结果表明:随着轨道平顺性的恶化，地基动刚度随应变频响非线性的变化将引起地铁盾构隧道各频段内的振动加速度级出现明显的非均匀变化；轨道不平顺恶化后，软土地基动刚度的非线性将改变地铁盾构隧道频域振动幅值大小，且其对应频率会出现约有0.2 Hz的偏移，致使地铁盾构隧道频域振动能量出现重分布现象.
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| 关 键 词： | 盾构隧道 软土 动刚度 轨道谱 随机振动 |
| 收稿时间： | 2012-12-11 |
Influence of Track Regularity and Soil Dynamic Characteristics on Vibration of Subway Tunnel |
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| WEI Kai,ZHAI Wanming,XIAO Junhua.Influence of Track Regularity and Soil Dynamic Characteristics on Vibration of Subway Tunnel[J].Journal of Southwest Jiaotong University,2013,26(6):989-995. |
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| Authors: | WEI Kai ZHAI Wanming XIAO Junhua |
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| Abstract: | In order to accurately calculate the frequency-domain vibration response of a subway shield tunnel due to dynamic loading of trains, a vertical coupling dynamic model of subway shield tunnel is established to study the influence of the nonlinear variation of soft-soil dynamic stiffness on the random vibration of subway shield tunnel at different levels of track irregularity. In this model, the dynamic stiffness of soft soil varies nonlinearly with the frequency-domain response of soft soil strain. The results show that along with the deterioration of track regularity, the nonlinear dynamic stiffness of soft soil causes obvious heterogeneous variations to the vibration accelerations in frequency domains of the subway shield tunnel. In addition, the nonlinear dynamic stiffness of soft soil not only alters the frequency-domain vibration amplitude of subway shield tunnel after the deterioration of track irregularity, but also makes the corresponding frequencies appear to shift, and the biggest deviation is about 0.2 Hz, which leads to a redistribution of the vibration energy of the subway shield tunnel in frequency domain. |
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