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Abstract: The increase in transportation in large cities has made it necessary to construct twin tunnels at shallow depths. As far as the parallel excavation of mechanized twin tunnels is concerned, most of the cases reported in previous studies have focused on the interactions between two horizontally driven tunnels. However, less work has been devoted to the interactions between tunnels stacked over each other. The numerical investigation performed in this study has made it possible to evaluate the influence of the construction process on two stacked tunnels, using the FLAC^3D finite difference element software. The structural forces induced in each of the stacked tunnels and the displacements in the surrounding ground have been highlighted. The results of the numerical analysis indicate that new tunnel construction can have a great impact on an existing tunnel. The greatest impacts are observed when the upper tunnel is excavated first. The excavation of the upper tunnel generally leads to greater surface settlements than when the lower tunnel is excavated first. This study also shows that the normal forces induced in the lower tunnel are always greater than those developed in the upper tunnel. The normal displacements and the bending moments induced in the lower tunnel are usually smaller than those in the upper tunnel.

软土地面中机械化双叠隧道的三维数值模拟

通过三维数值模拟，研究隧道施工过程对双叠隧道的影响。 使用全三维数值模拟方法研究软土中双叠隧道施工对先挖隧道或地面的影响。 1. 运用FLAC软件创建双叠隧道的三维数值模型（图1）；2. 分情况模拟机械化双叠隧道的挖掘过程；3. 研究不同情况下的地面沉降，水平地面位移，以及隧道衬砌的法向位移、法向力、纵向力和弯曲力矩等。 1. 新隧道施工对现有的隧道有很大的影响，最大影响出现在先挖上层隧道的情况下；2. 一般来说，上层隧道的挖掘会比下层隧道产生更大的地面沉降；3. 下层隧道产生的法向力总是比上层隧道大；4. 在多数情况下，下层隧道产生的法向位移和弯曲力矩要比上层隧道小。
三维模型；重叠隧道；段隧道衬砌；衬砌响应；地面沉降；隧道支护

[1] Afifipour, M., Sharifzadeh, M., Shahriar, K., 2011. Interaction of twin tunnels and shallow foundation at Zand underpass, Shiraz metro, Iran. Tunnelling and Underground Space Technology, 26(2):356-363. 

[2] Chakeri, H., Hasanpour, R., Hindistan, M.A., 2011. Analysis of interaction between tunnels in soft ground by 3D numerical modelling. Bulletin of Engineering Geology and the Environment, 70(3):439-448. 

[3] Channabasavaraj, W., Vishwanath, B., 2012. Influence of relative position of the tunnels—numerical analysis on interaction between twin tunnels. , Proceedings of Indian Geotechnical Conference, Delhi, India, 500-503. :500-503. 

[4] Chapman, D.N., Ahn, S.K., Hunt, D.V.L., 2007. Investigating ground movements caused by the construction of multiple tunnels in soft ground using laboratory model tests. Canadian Geotechnical Journal, 44(6):631-643. 

[5] Chen, R.P., Zhu, J., Liu, W., 2011. Ground movement induced by parallel EPB tunnels in silty soils. Tunnelling and Underground Space Technology, 26(1):163-171. 

[6] Choi, J.I., Lee, S., 2010. Influence of existing tunnel on mechanical behaviour of new tunnel. KSCE Journal of Civil Engineering, 14(5):773-783. 

[7] Dias, D., Kastner, R., 2013. Movements caused by the excavation of tunnels using face pressurized shields—analysis of monitoring and numerical modelling results. Engineering Geology, 152(1):17-25. 

[8] Dias, D., Kastner, R., Maghazi, M., 2000. Three Dimensional Simulation of Slurry Shield Tunnelling. Geotechnical Aspects of Underground Construction in Soft Ground, Balkema, Rotterdam :351-356. 

[9] Divall, S., Goodey, R.J., Taylor, R.N., 2012. Ground movements generated by sequential twin-tunnelling in over-consolidated clay. , 2nd European Conference on Physical Modelling in Geotechnics, Delft, The Netherlands, :

[10] Do, N.A., Dias, D., Oreste, P.P., 2013. 2D numerical investigation of segmental tunnel lining behaviour. Tunnelling and Underground Space Technology, 37:115-127. 

[11] Do, N.A., Dias, D., Oreste, P.P., 2014. Three-dimensional numerical simulation for mechanized tunnelling in soft ground: the influence of the joint pattern. Acta Geotechnica, 9(4):673-694. 

[12] Do, N.A., Dias, D., Oreste, P.P., 2014. Three-dimensional numerical simulation of a mechanized twin tunnels in soft ground. Tunnelling and Underground Space Technology, 42:40-51. 

[13] Do, N.A., Dias, D., Oreste, P.P., 2014. 2D tunnel numerical investigation: the influence of the simplified excavation method on tunnel behaviour. Geotechnical and Geological Engineering, 32(1):43-58. 

[14] Do, N.A., Dias, D., Oreste, P.P., 2014. 3D numerical investigation on the interaction between mechanized twin tunnels in soft ground. Environmental Earth Sciences, in press,:

[15] Ercelebi, S.G., Copour, H., Ocak, I., 2011. Surface settlement predictions for Istanbul metro tunnels excavated by EPB-TBM. Environmental Earth Sciences, 62(2):357-365. 

[16] Hage Chehade, F., Shahrour, I., 2008. Numerical analysis of the interaction between twin-tunnels: influence of the relative position and construction procedure. Tunnelling and Underground Space Technology, 23(2):210-214. 

[17] Hasanpour, R., Chakeri, H., Ozcelik, Y., 2012. Evaluation of surface settlements in the Istanbul metro in terms of analytical, numerical and direct measurements. Bulletin of Engineering Geology and the Environment, 71(3):499-510. 

[18] He, C., Feng, K., Fang, Y., 2012. Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 13(11):858-869. 

[19] Hefny, A.M., Chua, H.C., Zhao, J., 2004. Parametric studies on the interaction between existing and new bored tunnels. Tunnelling and Underground Space Technology, 19(4-5):471

[20] Hejazi, Y., Dias, D., Kastner, R., 2008. Impact of constitutive models on the numerical analysis of underground constructions. Acta Geotechnica, 3(4):251-258. 

[21] Hunt, D.V.L., 2005.  Predicting the Ground Movements above Twin Tunnels Constructed in London Clay. PhD Thesis, University of Birmingham,Birmingham :

[22] ITASCA, 2009.  FLAC Fast Lagrangian Analysis of Continua, Version 4.0. Itasca Consulting Group, Inc.,Minneapolis, USA :

[23] Jenck, O., Dias, D., 2004. Analyse tridimensionnelle en différences finies de l’interaction entre une structure en béton et le creusement d’un tunnel à faible profondeur. Gotechnique, (in French),54(8):519-528. 

[24] Karakus, M., Ozsan, A., Basarir, H., 2007. Finite element analysis for the twin metro tunnel constructed in Ankara Clay, Turkey. Bulletin of Engineering Geology and the Environment, 66(1):71-79. 

[25] Kasper, T., Meschke, G., 2004. A 3D finite element simulation model for TBM tunnelling in soft ground. International Journal for Numerical and Analytical Methods in Geomechanics, 28(14):1441-1460. 

[26] Kim, S.H., 1996. Model Testing and Analysis of Interactions between Tunnels in Clay, PhD Thesis, University of Oxford,:

[27] Li, X., Du, S., Zhang, D., 2012. Numerical simulation of the interaction between two parallel shield tunnels. , Proceeding of ICPTT: Better Pipeline Infrastructure for a Better Life, Wuhan, China, 1521-1533. :1521-1533. 

[28] Liu, H.Y., Small, J.C., Carter, J.P., 2008. Full 3D modelling for effects of tunnelling on existing support systems in the Sydney region. Tunnelling and Underground Space Technology, 23(4):399-420. 

[29] Mahmutoğlu, Y., 2011. Surface subsidence induced by twin subway tunnelling in soft ground conditions in Istanbul. Bulletin of Engineering Geology and the Environment, 70(1):115-131. 

[30] Mollon, G., Dias, D., Soubra, A.H., 2013. Probabilistic analyses of tunnelling-induced ground movements. Acta Geotechnica, 8(2):181-199. 

[31] Ng, C.W.W., 2014. The state-of-the-art centrifuge modelling of geotechnical problems at HKUST. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 15(1):1-21. 

[32] Ng, C.W.W., Lu, H., 2014. Effects of the construction sequence of twin tunnels at different depths on an existing pile. Canadian Geotechnical Journal, 51(2):173-183. 

[33] Ng, C.W.W., Lu, H., Peng, S.Y., 2013. Three-dimensional centrifuge modelling of the effects of twin tunnelling on an existing pile. Tunnelling and Underground Space Technology, 35:189-199. 

[34] Ocak, I., 2013. Interaction of longitudinal surface settlements for twin tunnels in shallow and soft soils: the case of Istanbul Metro. Environmental Earth Sciences, 69(5):1673-1683. 

[35] Suwansawat, S., Einstein, H.H., 2007. Describing settlement troughs over twin tunnels using a superposition technique. Journal of Geotechnical and Geoenvironmental Engineering, 133(4):445-468. 

[36] Wang, J.G., Kong, S.L., Leung, C.F., 2003. Twin tunnels-induced ground settlement in soft soil. , Proceeding of the Sino-Japanese Symposium on Geotechnical Engineering, 241-244. :241-244. 

[37] Yamaguchi, I., Yamazaki, I., Kiritani, Y., 1998. Study of ground-tunnel interactions of four shield tunnels driven in close proximity, in relation to design and construction of parallel shield tunnels. Tunnelling and Underground Space Technology, 13(3):289-304. 

[38] Yang, X.L., Wang, J.M., 2011. Ground movement prediction for tunnels using simplified procedure. Tunnelling and Underground Space Technology, 26(3):462-471. 

[39] Zhang, Z.G., Huang, M.S., 2014. Geotechnical influence on existing subway tunnels induced by multiline tunnelling in Shanghai soft soil. Computers and Geotechnics, 56:121-132. 

[40] Zheng, Y., Qiu, W., 2005. 3-D FEM Analysis of Closely Spaced Vertical Twin Tunnel.  Underground Space Use: Analysis of the Past and Lessons for the Future. Taylor & Francis Group,London :1155-1160. 

[41] Zhou, W.H., Chen, R.P., Zhao, L.S., 2012. A semi-analytical method for the analysis of pile-supported embankments. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 13(11):888-894.