砂土地层深基坑施工对侧方地铁隧道形变影响研究

Study on the Influence of Deep Foundation Pit Construction on Lateral Subway Tunnel

以沈阳市某工程为背景,采用有限元软件Midas GTS建立三维有限元分析模型,对基坑开挖引起侧方地铁盾构隧道三维变形进行数值分析,并将隧道模拟结果与实测变形值进行比较。研究表明:基坑开挖引起地铁隧道结构产生一定水平和竖向变形,整体变形趋势为斜向上指向基坑,水平位移和竖向位移均呈现两端变形小、中间变形大的抛物线规律,且隧道变形最大值位于基坑边线中点处,从监测结果可以得出水平及竖向变形值分别为3.5mm与2.98mm,水平位移量略大于竖向位移量,与数值模拟分析结果吻合度较好。

Taking a project in Shenyang as the background,the finite element software Midas GTS is used to establish a 3D finite element analysis model,and the 3D deformation of the side subway shield tunnel caused by the excavation ofthe foundation pit is numerically analyzed,and the tunnel simulation results are compared with the measured deformation value.The results show that the excavation of the foundation pit causes certain horizontal and vertical deformation of the subway tunnel structure,the overall deformation trend is obliquely pointing upward to the foundation pit,the horizontal displacement and vertical displacement show the parabolic law of small deformation at both ends and large middle deformation,and the maximum deformation of the tunnel is located at the midpoint of the edge of the foundation pit,and the horizontal and vertical deformation values can be concluded from the monitoring results of 3.5 mm and 2.98 mm,respectively,and the horizontal displacement is slightly greater than the vertical displacement,which is in good agreement with the numerical simulation analysis results.