[1]孙纬宇,严松宏,汪精河,等.SV波不同角度入射下近接双隧道的地震响应分析[J].东南大学学报(自然科学版),2019,49(5):956-963.[doi:10.3969/j.issn.1001-0505.2019.05.020]
 Sun Weiyu,Yan Songhong,Wang Jinghe,et al.Seismic response analysis on adjacent double tunnel at different incident angles of SV waves[J].Journal of Southeast University (Natural Science Edition),2019,49(5):956-963.[doi:10.3969/j.issn.1001-0505.2019.05.020]
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SV波不同角度入射下近接双隧道的地震响应分析()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第5期
页码:
956-963
栏目:
土木工程
出版日期:
2019-09-20

文章信息/Info

Title:
Seismic response analysis on adjacent double tunnel at different incident angles of SV waves
作者:
孙纬宇12严松宏13汪精河12梁庆国12
1兰州交通大学土木工程学院, 兰州 730070; 2兰州交通大学甘肃省道路桥梁与地下工程重点实验室, 兰州 730070; 3兰州交通大学甘肃省轨道交通力学应用工程实验室, 兰州 730070
Author(s):
Sun Weiyu12 Yan Songhong13 Wang Jinghe12 Liang Qingguo12
1School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
3
关键词:
黏弹性边界 SV波 双隧道 洞距 地震响应
Keywords:
visco-elastic boundary SV waves double tunnels tunnel distance seismic response
分类号:
TU435
DOI:
10.3969/j.issn.1001-0505.2019.05.020
摘要:
为了研究地震波入射角度和洞距对近接隧道动力响应特征的影响,采用黏弹性边界结合等效荷载的输入方法,实现了平面SV波斜入射的地震动输入,研究了不同SV波入射角度和隧道洞距时隧道衬砌应力的分布特征.结果表明:地震波入射角度对隧道衬砌应力的分布有较大影响.当地震波垂直入射时,隧道衬砌应力呈蝴蝶状(X状)的对称分布,在横断面内沿共轭45°方向受力较大;当地震波倾斜入射时,隧道衬砌的应力呈不对称状分布,在拱顶-30°~30°和仰拱120°~255°范围内受力较大.从隧道衬砌受力和震害情况来看,隧道拱部和仰拱部位在地震时容易发生破坏,在隧道抗震设计中应予以考虑.隧道衬砌应力随地震波入射角度的增大而增大,随洞距的增大而减小,且入射角度对隧道衬砌受力的影响较洞距的影响要大,在极震区隧道抗震设计要考虑地震波入射角度的影响.地震波倾斜入射时,两隧道间的合理净距为洞径的4倍.
Abstract:
To study the impact of incident angle of seismic waves and tunnel distances on the dynamic response characteristics of adjacent double tunnels, a input method for the visco-elastic artificial boundary combined with the equivalent load was adopted to realize the ground motion input of the oblique incident of SV waves and the stress distribution characteristics of tunnel lining at different incident angles of SV waves and tunnel distances were studied. The results show that the incident angle of seismic wave has a great influence on the stress distribution of tunnel lining. It is symmetrical in the butterfly shape(X shape)when seismic waves incident vertically, and the force along the direction of conjugate 45° is larger than the other directions in the cross section. And it is asymmetrical when seismic waves incident obliquely and the force along the direction of(-30° to 30°)and inverted arch(120° to 255°)is larger. According to the stress in tunnel and the earthquake damage of tunnel lining, the arch and inverted arch parts are easy to be damaged during earthquakes, it should be considered in seismic design of the tunnel. The stresses in tunnel lining increase with the increase of the incident angle, and decrease with the increase of the tunnel distance. The incident angle has a great influence than tunnel distance for the stresses in tunnel lining. The seismic design of tunnels should consider the influence of incident angels on mesoseismal area. The reasonable distance between the adjacent double tunnels is 4 times of the diameter of the tunnel when seismic waves incident obliquely.

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备注/Memo

备注/Memo:
收稿日期: 2019-01-25.
作者简介: 孙纬宇(1988—),男,博士生;严松宏(联系人),男,博士,教授,博士生导师,yansonghong@163.com.
基金项目: 国家自然科学基金资助项目(51268030,41562013)、兰州交通大学青年科学基金资助项目(2017020)、兰州交通大学甘肃省道路桥梁与地下工程重点实验室开放基金资助项目(1200110206-2).
引用本文: 孙纬宇,严松宏,汪精河,等.SV波不同角度入射下近接双隧道的地震响应分析[J].东南大学学报(自然科学版),2019,49(5):956-963. DOI:10.3969/j.issn.1001-0505.2019.05.020.
更新日期/Last Update: 2019-09-20