摘要
为研究不同结构形式的连拱隧道的地震响应特征,依托兰永临高速公路辛家隧道洞口段连拱隧道,采用ABAQUS软件建立中墙式、隐中墙式、密贴式三种连拱隧道结构二维数值模型,选取EL-Centro波、汶川卧龙波、Loma波三种典型强震记录作为输入波,采用波动数值方法进行三种连拱结构的动力响应数值计算,对比分析三种结构的位移、加速度、应力响应和围岩塑性区分布情况。结果表明:三种结构形式在不同的地震波作用下呈现的位移、加速度响应规律一致。水平位移最大值出现在两侧拱腰处,加速度最大值出现在拱顶。地震波类型对位移、加速度的数值影响显著,数值大小为Loma波>EI-Centro波>汶川波。三种结构的第一主应力分布规律有较大差异,第三主应力分布规律相似。对于中墙式和密贴式结构,中间部位是抗震的薄弱部位;对于隐中墙式结构,仰拱是薄弱部位,且第一主应力集中区域较其他两种结构形式更大。三种结构的围岩塑性区均集中于左右洞拱脚处及中墙底部,密贴式结构的塑性区面积最小。综合位移、加速度、应力和塑性区指标,密贴式结构抗震性能更优。
To study the seismic response characteristics of multi arch tunnels with different structural forms,based on the Xinjia Tunnel entrance section of the Lanyonglin Expressway,ABAQUS software was used to establish two-dimensional numerical models of three types of multi arch tunnel structures:middle wall,hidden middle wall,and close fitting middle wall.Three typical strong earthquake records,EL Centro wave,Wenchuan Wolong wave,and Loma wave,were selected as input waves,and wave numerical methods were used to calculate the dynamic response of the three multi arch structures.The displacement,acceleration response,stress response,and plastic zone distribution of the surrounding rock of the three structures were compared and analyzed.The results show that the final displacement values of the three structures under the same seismic wave are similar.The final displacement values of the close fitting structure under EI Centro,Wenchuan,and Loma waves are 1.679 mm,2.346 mm,and 3.635 mm,respectively;The acceleration patterns of the three structural forms under different seismic waves are generally consistent,but there are still some differences;Under the same wave,there is a significant difference in the first principal stress among the three structural forms,while the third principal stress is similar.Among them,the first principal stress of the hidden wall type is the smallest,and the third principal stress of the close fitting type is the largest.However,the first principal stress area of the hidden wall type is larger than that of other structures;The plastic zone of the surrounding rock is concentrated at the arch foot and the bottom of the tunnel,and the area of the dense plastic zone is the smallest;Based on the comprehensive indicators of displacement,acceleration,stress,and plastic zone,the seismic performance of the close fitting structure is better.
作者
陈涛
穆显亮
陈锴
张冬
汪精河
郭钰祥
CHEN Tao;MU Xianliang;CHEN Kai;ZHANG Dong;WANG Jinghe;GUO Yuxiang(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070;China Railway 20th Bureau Group Corporation Limited,Xi′an 710016)
出处
《现代隧道技术》
北大核心
2025年第S1期552-563,共12页
Modern Tunnelling Technology
基金
甘肃省重点研发计划(23YFGA0086)
关键词
连拱隧道
地震响应
数值模拟
中墙式
隐中墙式
密贴式
Multi-arch tunnel
Seismic response
Numerical simulation
Middle-wall type
Hidden middle-wall type
Close-fitting middle-wall type
