摘要
针对采用盾构法修建的相邻双洞水平平行布置的地铁隧道,考虑8种双洞净距工况,通过三维数值模拟,研究服役期迷流影响下地铁双洞的电位分布特性.结果表明:对于双洞净距为0.5~4 B的地铁隧道,当双洞泄漏迷流时,靠近中夹岩的轨底电位比远离中夹岩的轨底电位高;在一环管片中,靠近中间岩的拱脚处的标准块的电位最大,这一块管片的电腐蚀风险最大;当双洞之间的净距小于2 B时,随着净距的减小,轨底电位急剧增大;当双洞之间的净距大于2 B时,随着净距的增大,轨底电位变化相对很小.
Based on the shield tunneling method,the potential distribution characteristics of the two tunnels under the influence of stray current during the service period were studied by three dimensional numerical simulation considering eight net distance conditions of the two tunnels.The results show that,for the subway tunnel with the net distance of 0.5~4 B,when the double hole leakage stray current occurs,the rail bottom potential near the middle rock is higher than that far away from the middle rock;In a ring segment,the standard block near the arch foot of the middle rock has the largest potential,and this segment has the greatest risk of electrical corrosion;When the net distance between two holes is less than 2 B,the rail bottom potential increases sharply with the decrease of net distance;When the net distance between the two holes is greater than 2 B,the change of rail base potential is relatively small with the increase of net distance.
作者
刘瑞康
岳健
朱铁环
安永林
LIU Ruikang;YUE Jian;ZHU Tiehuan;AN Yonglin(School of Civil Engmeering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Mechanical and Electrical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《湖南理工学院学报（自然科学版）》
CAS
2021年第4期37-42,共6页
Journal of Hunan Institute of Science and Technology(Natural Sciences)
基金
湖南省普通高等学校教学改革研究项目(HNJG-2020-0482)。
关键词
地铁隧道
双洞净距
迷流
电位分布特性
管片分块
subway tunnel
double hole net distance
stray current
potential distribution characteristics
segment block
