| 衬砌纵向开裂隧道地震响应振动台的试验研究 |
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| 引用本文： | 李冰天,仇文革,戚幸鑫,邓旨珩,胡辉.衬砌纵向开裂隧道地震响应振动台的试验研究[J].西南交通大学学报,2021,56(1):20-27, 55. |
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| 作者姓名： | 李冰天 仇文革 戚幸鑫 邓旨珩 胡辉 |
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| 基金项目： | 国家重点研发计划（2017YFC0806006）；国家自然科学基金资（51038009）；高铁联合基金（U1434206） |
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| 摘 要： | 为了研究高速铁路双线隧道衬砌纵向裂缝对结构抗震安全性的影响，针对《铁路隧道设计规范》（TB 10003—2016）IV级围岩开展大型振动台模型试验，试验采用改进的静动耦合剪切模型箱，考虑隧道埋深、衬砌开裂位置和开裂形式3个影响因素，分析隧道衬砌的地震动应变和结构内力响应规律. 试验结果表明:在地震剪切波作用下，浅埋隧道和深埋隧道衬砌结构的破坏形式分别为受拉破坏和受压破坏，破坏位置均首先出现在拱腰，对应的无裂缝衬砌破坏时振动台台面输入波峰值加速度分别为0.8g和0.9g；拱顶和边墙处裂缝对隧道衬砌结构抗震安全性影响较小，而拱腰处裂缝影响显著；浅埋和深埋条件下，拱腰处有裂缝的衬砌破坏时振动台台面输入波峰值加速度分别为0.5g和0.6g；纵向裂缝的开裂形式不同，衬砌破坏时对应的峰值加速度基本相同；在深埋条件下，相比于正截面裂缝，拱腰处斜截面裂缝导致衬砌结构破坏后变形速度加剧.
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| 关 键 词： | 隧道 衬砌结构 纵向裂缝 地震响应 振动台试验 |
| 收稿时间： | 2019-07-08 |
Shaking Table Tests on Seismic Response of Tunnel with Longitudinal Cracking Lining |
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| LI Bingtian,QIU Wenge,QI Xingxin,DENG Zhiheng,HU Hui.Shaking Table Tests on Seismic Response of Tunnel with Longitudinal Cracking Lining[J].Journal of Southwest Jiaotong University,2021,56(1):20-27, 55. |
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| Authors: | LI Bingtian QIU Wenge QI Xingxin DENG Zhiheng HU Hui |
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| Abstract: | In order to study the influence of longitudinal cracks in the lining of double track tunnel of high speed railway on the seismic safety of the structure, a large-scale shaking table model test was carried out on class IV surrounding rock in accordance with the Code for design of railway tunnel (TB 10003—2016). The test adopted an improved static-dynamic coupling shear model box to analyze the response rules of seismic strain and structural internal force of tunnel lining, taking into consideration three influencing factors including the tunnel buried depth, the cracking position and the cracking form of lining. The test results showed that under the action of seismic shear wave, the failure mode of the shallow tunnel is tension failure, while that of the deep tunnel is compression failure, both of which occur at the arch waist. The peak acceleration of input wave of the shaking table was 0.8g and 0.9g, respectively, when the crack-free lining was damaged at the two buried depths. Cracks in vault and sidewall have little influence on seismic response of tunnel, while the cracks at the arch waist have significant effect. Under the shallow and deep buried conditions, the peak acceleration of the input wave of the shaking table was 0.5g and 0.6g, respectively, when the lining with cracks at the arch waist was damaged. For deep-buried tunnels, compared with the normal section cracks, inclined section cracks at the arch waist will speed up the deformation of lining structure after failure but have little influence on the critical value of failure acceleration. |
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