地铁致凸形地貌地表振动局部放大现象实测及机理分析

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摘要法源寺文保区毗邻地铁4号线，区域受地铁振动影响较大。本文通过对地铁运行影响下法源寺文保区的现场振动测试，发现浏阳会馆位置存在明显的地表振动局部放大现象，通过相关通过相关分析得出如下结论：（1）浏阳会馆位置为典型的凸形地貌，其地表振动“局部放大区”出现在振中距1.5~3.0倍左线隧道埋设范围内，这与现有研究成果（约1~1.5倍隧道埋深）并不相同。（2）基于弹性波场理论，分析了地下埋置振源下凸形地貌地表振动放大区形成机理为：传递到凸形地貌内的振动波一方面会在坡脚产生绕射，形成以坡脚为新的振源点的波场，并部分转化为面波沿坡面传播，这样远离坡脚的界面透射波、坡脚新绕射波、坡面面波及表层土内的多次反射波便会在凸形地貌地表进行叠加；另一方面凸形地貌为若干介质层的组合，其波阻抗一般会随地层深度的减小而减小，传递到凸形地貌的透射波在向上传递的过程中，波速会不断放大，最终导致凸形地貌地表振动的局部放大。（3）采用二维有限元模型对地铁致凸形地貌地表振动局部放大现象进行了数值验证，结果发现凸形地貌地表竖向加速度峰值在其波阻抗由深及表逐渐衰减时，凸形地貌地表振动局部放大效应最为明显，数值计算结果与实测值基本吻合；数值计算结果还发现凸形地貌地表竖向加速度峰值随着地貌高度的增大而增加，达到临界值后，又会随着地貌高度的增大而降低，表明凸形地貌的振动放大效应并非会随着高度增加的而无限增大，其只在一定高度范围内存在。

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	赵江涛1
	牛晓凯1
	苏洁2
	王宇哲2

关键词 ：地铁, 振动测试, 凸形地貌, 振动衰减, 局部放大

Abstract：Fayuan Temple historic reservation is adjacent to Metro Line 4, the residents of which place are affected by subway vibration for a long time. Based on the in-situ vibration measurements, the local amplification phenomena is found in the region where Liuyang Guild Hall is located. A further study is conducted, and results show that: (1) Liuyang Guild Hall is the protruding topography, and it is a characteristic region called the local amplification region (LAR), where the ground vibration does not attenuate monotonically with the increasing of the distance from the epicenter, but there exists vibration amplification region somewhere else. LAR of Liuyang Guild Hall appears with a distance of about 1.5~3.0 burial depth from the epicenter, which is different from other peoples. (2) Base on the theory of elastic wave propagation, mechanism for local amplification phenomena of ground vibration in the protruding topography induced by subway is analyzed. On the one hand, the vibration wave transmitted to the protruding topography will diffract at the foot of the slope, so a wave field is formed with the foot of the slope as a new vibration source point, and partially converts to surface wave to propagate at surface. So that the transmitted wave, the new diffraction wave at the foot of the slope, the surface wave, and the reflected wave of the topsoil will superpose on the surface of the protruding topography. On the other hand, the protruding topography is a combination of several media layers, and its wave impedance will generally decrease with the decrease of the depth of the ground layer. In the process of the transmitted wave transmitting up to the ground, the wave velocity will be continuously enlarged, then resulting in the local amplification phenomena of ground vibration in the protruding topography. (3) The two-dimensional finite element model is used to verify the l local amplification phenomena of ground vibration in the protruding topography induced by subway. The numerical results show that the local amplification local amplification phenomena is the most obvious when the wave impedance decrease with the decrease of the depth of the ground layer. The numerical results are in good agreement with the in-situ measurement, which can validate the correctness of mechanism analysis for local amplification phenomena. It is also found that the peak value of vertical acceleration can magnify with the increase of the height, and then decreases with the increase of the height when it reaches the critical value. It indicates that the local amplification phenomena of ground vibration in the protruding topography does not magnify infinitely with the increase of height, but only exists in a certain height range.

Key words： subway vibration test the protruding topography vibration attenuation local amplification

收稿日期: 2020-10-20 出版日期: 2022-02-28

引用本文:

赵江涛1，牛晓凯1，苏洁2，王宇哲2. 地铁致凸形地貌地表振动局部放大现象实测及机理分析[J]. 振动与冲击, 2022, 41(4): 287-293.
ZHAO Jiangtao1, NIU Xiaokai1, SU Jie2, WANG Yuzhe2. In-situ measurement and mechanism analysis for local amplification phenomena of ground vibration in the protruding topography induced by subway. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(4): 287-293.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I4/287

[1] 李杨，王满生，惠擎宇，等. 地铁运行引起典型砖混结构振动的现场测试与影响评价方法研究[J]. 建筑结构，2017，47(S2)：522–527.
LI Yang，WANG Mansheng，HUI Qingyu，et al. Influence of Environmental Vibration Caused by Subway Operation on Typical Brick-concrete Structure and Evaluation Methods[J]. Building Structure，2017，47(S2)：522–527.
[2] 孙晓静. 地铁列车振动对环境影响的预测研究及减振措施分析[博士学位论文][D]. 北京：北京交通大学，2008.
SUN Xiaojing. Prediction of Environment Vibrations Induced by Metro Trains and Mitigation Measures Analysis [Ph. D. Thesis][D]. Beijing：Beijing Jiaotong University，2008.
[3] 马蒙. 基于敏感度的地铁列车振动环境影响预测及动态评价体系研究[博士学位论文][D]. 北京：北京交通大学，2012.
MA Meng. Study on the Prediction of Metro Train-induced Vibrations Based on Sensitivity of Environmental Influence anal Design Stage-Accompanied Evaluation System [Ph. D. Thesis][D]. Beijing：Beijing Jiaotong University，2012.
[4] 张啟乐，刘林芽，李纪阳. 地铁运行引起地面局部振动放大现象的数值分析[J]. 噪声与振动控制，2015，35(2)：116–120.
ZHANG Qile，LIU Linya，LI Jiyang. Numerical Analysis of Ground Vibration Amplification Phenomenon Caused by Subway Operation[J]. Noise And Vibration Control，2015，35(2)：116–120.
[5] 宗刚，张永红，任晓崧. 地铁致地表振动局部放大现象实测与机理分析[J]. 振动与冲击，2017，36(9)：247–252.
ZONG Gang，ZHANG Yonghong，REN Xiaosong. In-situ measurement and mechanism analysis for local amplification phenomena of metro induced ground-borne vibration[J]. Journal Of Vibration And Shock，2017，36(9)：247–252.
[6] 卢华喜，徐路遥，梁平英，等. 凸起地形对铁路环境振动的影响分析[J]. 岩土力学，2019，40(4)：1561–1568.
LU Huaxi，XU Luyao，LIANG Pingying，et al. Influence of hill on railway environmental vibration[J]. Rock and Soil Mechanics，2019，40(4)：1561–1568.
[7] 张光明. 高速铁路路基段地面振动响应研究[D]. 成都：西南交通大学，2010.
ZHANG Guangming. Study on the Ground Vibration induced by Trains Moving on Subgrade of High-speed Railway[Ph. D. Thesis][D]. Chengdu：Southwest Jiaotong University，2010.
[8] 王田友. 地铁运行所致环境振动与建筑物隔振方法研究[博士学位论文][D]. 上海：同济大学，2007.
WANG Tianyou. Study on Subway-induced Environmental Vibration and Isolation Method of Building from It [Ph. D. Thesis][D]. Shanghai：Tongji University，2007.
[9] 中华人民共和国住房和城乡建设部. JGJ/T 170–2009城市轨道交通引起建筑物振动与二次辐射噪声限值及其测量方法标准[S]，2009.
Ministry of Housing and Urban-Rural Construction of Peoples Republic of China. JGJ/T 170–2009 Standard for limit and measuring method of building vibration and secondary noise caused by urban rail transit[S]，2006.
[10] 中华人民共和国环境保护局. GB10070–88城市区域环境振动标准[S]，1998.
Environmental Protection Bureau of Peoples Republic of China. GB10070–88 Standard of environmental vibration in urban area[S]，1998.
[11] 郑鑫，陶夏新，王福彤，等. 轨道交通地面振动衰减关系中局部放大现象形成机理研究[J]. 振动与冲击，2014，33(3)：35–40.
ZHENG Xin，TAO Xiaxin，WANG Futong，et al. Mechanism of local amplification in attenuation of ground vibration induced by rail traffic[J]. Journal of Vibration and Shock，2014，33(3)：35–40.
[12] 唐海. 地形地貌对爆破振动波影响的实验和理论研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2007.
TANG Hai. Field Experimental and Theoretical Study on Blating Wave Propagation Characteristics under Different Terrains[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics Chinese Academy of Sciences，2007.
[13] 邹蓓. 地铁列车移动荷载下环境振动响应分析及减振研究[硕士学位论文][D]. 武汉：武汉理工大学，2017.
ZOU Bei. Study on Vibration Response and Vibration Reduction of Subway Train under Moving Load[Master's thesis][D]. Wuhan：Wuhan University of Technology，2017.