Study On The Influence Of The Tunnel Of Chongqing Rail Transit No. 3 For The High-rise Buildings On The Ground

Chongqing Rail Transit no. 3 is the most important transport hub connected Yudong in banan and Jiangbei airport. The routs pass through a number of tall buildings from underground, while bridge Yangtze River and Jialing River. There are some severe ordeals in the design and construction of Chongqing Rail Transit no. 3. The paper mainly studied how the high-rise buildings on the ground influence the tunnel of Chongqing Rail Transit no. 3. The 3D geological model and the finite element numerical analysis model are established in the thesis. The paper analyses that the high-rise buildings on the ground influence the underground tunnel to judge and evaluate the safety degree of the tunnel.Main Research Contents:(1)On the affected segment of the tunnel people drill for the rock sample,and do the geotechnical laboratory test for the specimen. Doing the acoustic test, and the high-resolution imaging tests in situ using of the borehole, it find out the details of the affected section of the tunnel engineering geology.(2)Using the urban underground space information integration management platform developed by Chongqing Survey Institute independently, it establish the engineering geology three-dimensional model of layered structure on the affected segment of the tunnel, and research the effect of underground tunnels under the ground buildings.(3)On the affected section of the tunnel, there are lining concrete strength detection, carbonization depth detection, lining crack detection and lining seepage observation. According to these data, it built the finite element numerical analysis model of how the high-rise buildings on the ground influence the tunnel of Chongqing Rail Transit no. 3, and carries on the numerical simulation analysis of influence. Getting the changes of the stress and displacement of the tunnel lining structure under the high-rise buildings’ influence, it assess the safety of the underground tunnel structure.According to the analyzing survey and numerical simulation of the affected section of the tunnel, it demonstrates the construction of this high-rise building project have influenced the tunnel of Chongqing Rail Transit no. 3,but still within a safe and controllable degree range. If the height of the high-rise buildings continue to increase, it should take appropriate technical measures to strictly control tunnel lining structure stress and the orbital tilt deformation, to ensure the safety of Chongqing Rail Transit no. 3.