[1]赵英伟.高烈度地震区倾斜隧道洞口段抗减震技术研究[J].高速铁路技术,2024,(02):32-38.[doi:10.12098/j.issn.1674-8247.2024.02.006]
　ZHAO Yingwei.Study on Anti-seismic and Vibration Reduction Techniques for Inclined Tunnel Portal Sections in High Seismic Intensity Zones[J].HIGH SPEED RAILWAY TECHNOLOGY,2024,(02):32-38.[doi:10.12098/j.issn.1674-8247.2024.02.006]
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高烈度地震区倾斜隧道洞口段抗减震技术研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
期数:
2024年02期
页码:
32-38
栏目:
理论探索
出版日期:
2024-04-30

文章信息/Info

Title:
Study on Anti-seismic and Vibration Reduction Techniques for Inclined Tunnel Portal Sections in High Seismic Intensity Zones
文章编号:
1674-8247(2024)02-0032-07
作者:
赵英伟
中铁十四局集团第五工程有限公司，山东?济宁 272117
Author(s):
ZHAO Yingwei
The Fifth Engineering Co. ，Ltd. of China Railway Fourteenth Bureau Group Co. ，Ltd. ，Jining? 272117 ，China
关键词:
隧道工程; 高烈度地震区; 倾斜隧道; 洞口段; 抗减震措施
Keywords:
tunneling; high seismic intensity zones; inclined tunnels; portal sections; anti-seismic measures
分类号:
U455
DOI:
10.12098/j.issn.1674-8247.2024.02.006
文献标志码:
A
摘要:
为提升高烈度地震区倾斜隧道洞口段的抗震性能，依托某隧道工程，利用有限差分数值软件FLAC3D研究了注浆加固和减震层的抗减震效果。结果表明：(1)隧道纵向应力极值和位移最大值出现在洞口中间过渡段，监测面内应力极值和位移最大值均出现在衬砌结构拱脚；(2)与无抗减震措施相比，注浆加固与施作减震层均能减少隧道二次衬砌位移差，施作减震层后隧道竖向位移差减少最多，减震效果达到74.83％；(3)工况1(无措施)最小主应力峰值最大，为-28.64MPa，施作减震层后为-20.05MPa，减震效果达到29.99％；(4)随着隧道纵向长度的增加，最小安全系数先减小后增大，最小值出现在中间过渡段监测面S3处；工况1安全系数为1.95，工况2为2.24，但仍低于安全阀值，工况3为2.56，符合安全要求。综合位移、应力和安全系数，采用减震层的抗减震效果优于注浆加固。研究成果可为倾斜隧道洞口段抗减震设防设计提供参考。
Abstract:
To enhance the seismic performance of inclined tunnel portal sections in high seismic intensity zones，this study，based on a specific tunnel project，employed the finite difference numerical software FLAC3D to investigate the effectiveness of grouting reinforcement and vibration damping layers. Findings indicate：(1)The extreme longitudinal stress and maximum displacement occur in the intermediate transition section of the tunnel portal，while the extreme internal stress and maximum displacement are both observed at the skewback of the lining structure. (2)Compared to scenarios without anti-seismic measures，both grouting reinforcement and the implementation of a vibration damping layer reduce the differential displacement of the secondary lining. The vertical displacement difference is most significantly reduced after installing the damping layer，with a vibration reduction effectiveness of 74. 83％.(3)The minimum principal stress peak is highest in Condition 1(with no measures)，reaching -28. 64 MPa，and decreases to -20. 05 MPa after the installation of the damping layer，resulting in a vibration reduction effectiveness of 29. 99％. (4)As the longitudinal length of the tunnel increases，the minimum safety factor initially decreases before increasing，reaching its lowest value at monitoring surface S3 in the intermediate transition section. The safety factor is 1. 95 for Condition 1，and 2. 24 for Condition 2，which although improved，remains below the safety threshold，and rises to 2. 56 for Condition 3，meeting safety requirements. Considering displacement，stress，and safety factors，the adoption of a vibration damping layer demonstrates superior anti-seismic and vibration reduction performance compared to grouting reinforcement alone. The conclusions provide a valuable reference for the seismic-resistant design of inclined tunnel portal sections.

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备注/Memo

备注/Memo:
收稿日期：2024-01-08
作者简介：赵英伟(1976-)，男，工程师。
更新日期/Last Update: 2024-04-30