Influence Research on Pit Excavation Close to Existing Shield Tunnel

Abstract:

Pit excavation has a negative impact on the existing shield tunnel close to it. The deformation mechanism of the existing tunnel during the pit excavation was analyzed. Theoretical analysis results shows: excavation unloading decreases the pressure in horizontal direction of the tunnel, which causes tunnel taking the horizontal displacement to the pit side; convergent deformation keeps in horizontal stretching, vertical compression, but the deformation is aggravated; tunnel vertical uplift or settlement is determined by the pit excavation depth; precipitation would make tunnel sinking. Five domestic pit excavation engineering instance was collected, and the reliability of the analysis in this article is proved by the statistical analysis of the measured data.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 54-59
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.54
• Online since: March 2013
• Authors: Lin Liu, Peng Fei Ge, Gang Wei*, Zhi Jie Ying, Can Fang Luo, Xia Ting Fei
• Keywords: Deformation, Excavation, Pit, Shield Tunnel

References

[1] CAEN Yu, ZHANG Dong-mei. Analysis of monitoring data on tunnel heaving due to unloading of foundation pit excavation. Underground Space, 2004, 24(5)：748-751. (in Chinese).

[2] LI Zhi-gao, LIU Hao, LIU Guo-bin, et al. Influence analysis of deep-dip excavation on down tunnel based on the measured displacement. Chinese Journal of Underground Space and Engineering, 2005, 1(4)：619-623. (in Chinese).

[3] KUANG Long-chuan. Influence of construction of deep foundation pit on tunnels of metro. Chinese Journal of Geotechnical Engineering, 2000, 22(3): 284-288. (in Chinese).

[4] WANG Wei-dong, SHEN Jian, WEN Qi-ping. Analysis and countermeasures of influence of excavation on adjacent tunnels. Chinese Journal of Geotechnical Engineering, 2006, 28(Supp. ): 1340-1345. (in Chinese).

[5] JIANG Hong-sheng, HOU Xue-yuan. The influence of deep excavation on adjacent metro tunnel in soft ground. Industrial Construction, 2002, 32(5): 53-56. (in Chinese).

[6] GAO Guang-yun, GAO Meng, YANG Chen-bin, et al. Influence of deep excavation on deformation of operating metro tunnels and countermeasures. Chinese Journal of Geotechnical Engineering, 2010, 32(3)：453-459. (in Chinese).

[7] LIU Ting-jin. Study on shield tunnel deformation due to foundation pit construction. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(Supp. 2)：3393-3400. (in Chinese).

[8] ZHANG Zhi-guo, ZHANG Meng-xi, WANG Wei-dong. Two-stage method for analyzing effects on adjacent metro tunnels due to foundation pit excavation. Rock and Soil Mechanics, 2011, 32(7): 2085-2092. (in Chinese).

[9] ZHANG Zhi-guo, ZHANG Xie-dong, WANG Wei-dong. Numerical modeling analysis on deformation effect of metro tunnels due to adjacent excavation of foundation pit. Journal of Wuhan University of Technology, 2007, 29(11): 93-97. (in Chinese).

[10] HU Guo-xin, LIU Ting-jin, CHEN Jun-sheng et al. Numerical analysis of influence of the pit three-dimensional seepage close to the running tunnels. Railway Engineering, 2007, (7): 42-44. (in Chinese).

[11] WU Huai-na, XU Ye-shuang, SHEN Shui-long, et al. Effect of dewatering on the existing river-crossing tunnel in soft ground. Journal of Shanghai Jiaotong University, 2012, 46(1)：53-57. (in Chinese).