摘要
基坑开挖会对下卧隧道产生影响,研究其影响规律可为保护下卧隧道提供参考。采用数值手段对某地区隧道上方基坑开挖进行了研究,重点研究了基坑开挖对隧道影响,并对相关参数变化影响进行了分析,主要结论如下:基坑开挖之后,隧道会发生整体的隆起,其中基坑正中心隧道顶部的隆起最大;将数值模拟得到的数据和实测数据进行对比,验证了模型的合理性及可靠性;基坑开挖诱发土体出现卸荷效应,从而引起隧道向上隆起,且随着基坑开挖深度的增大,隧道竖向位移增大;随着隧道中心与基坑底部距离的增大,基坑开挖卸荷效应对隧道产生的影响将逐渐减小,从而使得隧道竖向位移逐渐减小。
The underneath tunnel is influenced by the foundation pit excavation.Its influence rule is studied,so as to provide reference for the protection of the underneath tunnel.The foundation pit excavation above the tunnel in an area with numerical method is studied,the influence of the foundation pit exaction on the tunnel is emphatically studied,and the influence of relevant parameter changes is analyzed.The main conclusions are as follow:after the foundation pit excavation,the overall uplift of the tunnel appears,of which the uplift at the top of the tunnel in the center of the foundation pit is the largest;the data obtained from numerical simulation is compared with the measured data,so as to verify the rationality and reliability of this model;the unloading effect of soil body appears due to the foundation pit excavation,thus causing the uplift of the tunnel,and with the increase of the foundation pit excavation depth,the vertical displacement of the tunnel increases;with the increase of the distance from the tunnel center to the bottom of the foundation pit,the influence of the unloading effect of the foundation pit excavation on the tunnel decreases gradually,thus making the vertical displacement of the tunnel decrease gradually.
作者
朱冬冬
Zhu Dongdong(Xinjiang Xinlu Traffic Engineering Co.,Ltd.,Urumqi 830000,China)
出处
《北方交通》
2021年第7期71-74,共4页
Northern Communications
关键词
基坑工程
下覆隧道
变形
影响因素
数值模拟
Foundation pit engineering
Underneath tunnel
Deformation
Influencing factor
Numerical simulation
