地震高烈度区软岩隧道结构动力响应特性研究

摘要
图/表
参考文献
相关文章 (8)

全文: PDF (2263 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要 研究目的:为研究地震作用下地震高烈度区软岩隧道加速度动态响应的基本规律,以拉林铁路杰德秀2号隧道工程为背景,设计进行了1 ∶50比例隧道结构模型的振动台试验。通过输入白噪声、EL波和汶川波,测试模型结构的动力响应,分析各个测点峰值加速度的放大系数随高程变化和不同地震烈度条件下的变化规律,并通过快速傅里叶变化得到功率谱频谱曲线,分析模型结构的加速度动力特性,对比各个加载工况下加速度频域响应曲线,研究模型结构频域动力响应的基本规律。
研究结论:(1)地震高烈度区软岩隧道其场地高程效应的表现形式与一般场地表现不同;(2)随着地震动幅值的增大,各测点峰值加速度放大系数呈减小趋势,在0.15g加速度激励下表现出最大值,且不同频率特征地震波激励对高程效应形态的影响基本一致,仰拱处地震响应最大,在进行隧道抗震设防时,应加强对仰拱部位的抗震措施;(3)围岩土体对加速度放大效应较为显著,而隧道衬砌结构对加速度的放大效应效果不太明显,地层的响应特性在很大程度上决定着衬砌结构的地震响应特性;(4)功率谱密度曲线显示出不同地震波激励下模型结构响应峰值相差不大,但峰值所对应的频率值不同,高频段地震波对衬砌结构影响较小,低频段地震波对衬砌结构影响较大;(5)本研究成果可为地震高烈度区隧道抗震设计建设提供一定的理论参考。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	李仁强
	马至刚
	衣忠强
	朱宝龙
	吴红刚

关键词 ：软岩隧道, 振动台试验, 加速度响应, 频谱曲线

Abstract：Research purposes: In order to study the basic law of dynamic acceleration response of soft rock tunnel in high seismic intensity area under earthquake action, shaking table test of 1 ∶50 scale tunnel model was designed and carried out on the background of Jiedexiu No.2 tunnel project of Lasa-Linzhi Railway. Through input white noise, EL wave and the wave of Wenchuan, the dynamic response of model structure is tested, the change rule of peak acceleration amplification coefficient of various points with the change of height and different seismic intensity is analyzed, the power spectrum is obtained by fast Fourier change spectrum curve, the acceleration dynamic characteristics of the model structure are analyzed, the acceleration response curves in frequency domain under various loading conditions are compared, and the basic law of dynamic response in frequency domain of the model structure is studied.
Research conclusions:(1) The site elevation effect of soft rock tunnel in high seismic intensity area is different from that of general site. (2) With the increase of ground motion amplitude, the peak acceleration amplification coefficient of each measuring point shows a decreasing trend, and shows a maximum value under 0.15g acceleration excitation. The influence of seismic wave excitation with different frequency characteristics on the elevation effect form is basically the same, and the seismic response at the inverted arch is the largest. When conducting tunnel seismic fortification, the seismic measures at the inverted arch should be strengthened. (3) The amplification effect of surrounding rock soil on acceleration is obvious, but the amplification effect of tunnel lining structure on acceleration is not obvious. The response characteristics of stratum largely determine the seismic response characteristics of lining structure. (4) The power spectral density curve shows that the response peaks of the model structure under different seismic waves are similar, but the corresponding frequency values are different. The high frequency seismic waves have little influence on the lining structure, and the low frequency seismic waves have great influence on the lining structure. (5) The research results can provide a theoretical reference for the seismic design and construction of tunnels in high seismic intensity areas.

Key words： soft rock tunnel shaking table test acceleration response spectrum curve

收稿日期: 2022-02-18

PACS:

U25

基金资助:国家重点研发计划(2018YFC1504901);甘肃省自然科学基金(21JR7RA738);中铁九局集团第六工程有限公司科技发展项目(KJ-2021-05)

作者简介: ^**李仁强,1979年出生,男,正高级工程师。

引用本文:

李仁强, 马至刚, 衣忠强, 朱宝龙, 吴红刚. 地震高烈度区软岩隧道结构动力响应特性研究[J]. 铁道工程学报, 2022, 39(9): 56-63.
LI Renqiang, MA Zhigang, YI Zhongqiang, ZHU Baolong, WU Honggang. Research on the Dynamic Response Characteristics of Soft Rock Tunnel Structure in High Seismic Intensity Area. Journal of Railway Engineering Society, 2022, 39(9): 56-63.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I9/56

[1]	赵福善.兰渝铁路两水隧道高地应力软岩大变形控制技术[J]. 隧道建设,2014(6):546-553.Zhao Fushan. Technologies to Control Serious Deformation of Soft Rocks with High Ground Stress:Case Study on Liangshui Tunnel on Lanzhou–Chongqing Railway[J]. Tunnel Construction,2014(6):546-553.
[2]	何满潮,景海河,孙晓明. 软岩工程力学[M].北京:科学出版社,2002.He Manchao, Jing Haihe, Sun Xiaoming. Engineering Mechanics of Soft Rock[M]. Beijing: Science Press, 2002.
[3]	汪波,李天斌,何川,等.强震区软岩隧道大变形破坏特征及其成因机制分析[J].岩石力学与工程学报,2012(5):928-936.Wang Bo, Li Tianbin, He Chuan, etc. Analysis of Failure Properties and Formatting Mechanism of Soft Rock Tunnel in Meizoseismal Areas [J]. Chinese Journal of Rock Mechanics and Engineering, 2012(5):928-936.
[4]	宋章,杜宇本,陶玉敬, 等.强震区成兰铁路某隧道大变形地质成因分析[J].铁道工程学报,2016(10):90-96.Song Zhang,Du Yuben,Tao Yujing, etc. Analysis of the Geologic Origin of Large Deformation of a Tunnel of Chengdu-Lanzhou Railway in Meizoseismal Areas[J]. Journal of Railway Engineering Society, 2016(10):90-96.
[5]	陈子全,何川,吴迪,等.高地应力层状软岩隧道大变形预测分级研究[J].西南交通大学学报,2018(6):1237-1244.Chen Ziquan, He Chuan, Wu Di, etc. Study of Large Deformation Classification Criterion for Layered Soft Rock Tunnels under High Geostress [J]. Journal of Southwest Jiaotong University, 2018(6) :1237-1244.
[6]	关振长,龚振峰,罗志彬, 等.特大断面隧道地震动力特性的振动台试验研究[J].岩土力学,2016(9):2553-2560.Guan Zhenchang, Gong Zhenfeng, Luo Zhibin, etc. Seismic Property of a Large Section Tunnel Based on Shaking Table Model Tests [J]. Rock and Soil Mechanics, 2016(9):2553-2560.
[7]	耿萍,曹东杰,唐金良, 等.铁路隧道洞口合理抗震设防长度[J].西南交通大学学报,2012(6):942-948.Geng Ping, Cao Dongjie, Tang Jinliang, etc. The Reasonable Seismic Fortification Length of Railway Tunnel Entrance [J]. Journal of Southwest Jiaotong University, 2012(6):942-948.
[8]	关振长,罗志彬,徐遒, 等.基于振动台模型试验的特大断面隧道地震动态响应研究[J].工程地质学报,2017(3):648-656.Guan Zhenchang, Luo Zhibin, Xu Qiu, etc. Seismic Responses of Large Section Tunnel Based on Shaking Table Model Test [J]. Journal of Engineering Geology,2017(3):648-656.