Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil

Abstract Multiline tunneling construction in soft soil significantly impedes risk control and environmental protection. Current research has investigated on the effect of single-line shield excavation on surrounding environments and tunneling for parallel-crossing or perpendicular down-crossing underground structures. However, minimal attention has been given to soil disturbances induced by multiline tunneling and complex overlapped interaction mechanics for adjacent structures, such as existing above-crossing and down-crossing subway tunnels. Few studies focus on oblique crossing construction and setting rules for the operation parameters of shield machines. Based on the Shanghai Railway transportation project and in situ monitoring data, the deformation analyses of existing subway tunnels induced by an earth pressure balance (EPB) shield during the process of above-overlapped and down-overlapped crossing tunnels with oblique angles are presented. The deformation analyses employ the three-dimensional finite element (3D FE) numerical simulation method, and the simplified analytical method. The analysis results from the theoretical methods are consistent with the monitoring data. The setting rules of multiline propulsion main parameters, including the earth pressure for cutting open, and the synchronized grouting, are also established. This study may provide a theoretical basis for the development of properly overlapped crossing schemes and geotechnical protective measures during multiline tunneling construction in soft soil.

[1]  A. B. Vesic,et al.  Bending of Beams Resting on Isotropic Elastic Solid , 1961 .

[2]  O. C. Zienkiewicz,et al.  Application of an anisotropic hardening model in the analysis of elasto–plastic deformation of soils , 1979 .

[3]  Robert J. Mair,et al.  Observations of ground and structure movements for compensation grouting during tunnel construction at Waterloo station , 1994 .

[4]  Takeshi Asano,et al.  An observational excavation control method for adjacent mountain tunnels , 2003 .

[5]  C Sagaseta,et al.  ANALYSIS OF UNDRAINED SOIL DEFORMATION DUE TO GROUND LOSS , 1987 .

[6]  Harvey J. Burd,et al.  Model testing and analysis of interactions between tunnels in clay , 1996 .

[7]  Huei-Tsyr Chen,et al.  Tunnel stability and arching effects during tunneling in soft clayey soil , 2006 .

[8]  Sang-Duk Lee,et al.  Behavior of the ground in rectangularly crossed area due to tunnel excavation under the existing tunnel , 2006 .

[9]  S. Shen,et al.  Numerical evaluation of land subsidence induced by groundwater pumping in Shanghai , 2011 .

[10]  Majid Bahrami,et al.  Review of Thermal Joint Resistance Models for Nonconforming Rough Surfaces , 2006 .

[11]  R. K. Rowe,et al.  A method of estimating surface settlement above tunnels constructed in soft ground , 1983 .

[12]  Hiroshi Nakamura,et al.  UNIFIED CONSTRUCTION OF RUNNING TRACK TUNNEL AND CROSSOVER TUNNEL FOR SUBWAY BY RECTANGULAR SHAPE DOUBLE TRACK CROSS-SECTION SHIELD MACHINE , 2003 .

[13]  K. Soga,et al.  Centrifuge modelling of the effect of tunnelling on buried pipelines: mechanisms observed , 2005 .

[14]  M. Biot,et al.  Bending of an infinite beam on an elastic foundation , 1937 .

[15]  K. Y. Lo,et al.  Subsidence owing to tunnelling. I. Estimating the gap parameter , 1992 .

[16]  Isam Shahrour,et al.  Numerical analysis of the interaction between twin-tunnels: Influence of the relative position and construction procedure , 2008 .

[17]  Harry G. Poulos,et al.  Pile foundation analysis and design , 1980 .

[18]  S. E. Stallebrass,et al.  The development and evaluation of a constitutive model for the prediction of ground movements in overconsolidated clay , 1997 .

[19]  Charles Wang Wai Ng,et al.  Three-dimensional numerical investigations of new Austrian tunnelling method (NATM) twin tunnel interactions , 2004 .

[20]  S. Shen,et al.  Analysis of shearing effect on tunnel induced by load transfer along longitudinal direction , 2008 .

[21]  Fang-Le Peng,et al.  Field Measurements and Finite-Element Method Simulation of a Tunnel Shaft Constructed by Pneumatic Caisson Method in Shanghai Soft Ground , 2011 .

[22]  Xiaowu Tang,et al.  Ground movement induced by parallel EPB tunnels in silty soils , 2011 .

[23]  David M. Potts,et al.  Twin Tunnel Interaction: Surface and Subsurface Effects , 2001 .

[24]  Sang-Hwan Kim,et al.  Interaction behaviours between parallel tunnels in soft ground , 2004 .

[25]  Manuel Matos Fernandes,et al.  Three-Dimensional Nonlinear Analyses of a Metro Tunnel in São Paulo Porous Clay, Brazil , 2011 .

[26]  Li Xinggao,et al.  Response of a double-decked metro tunnel to shield driving of twin closely under-crossing tunnels , 2012 .

[27]  Louis Ngai Yuen Wong,et al.  Shallow tunnelling method (STM) for subway station construction in soft ground , 2012 .

[28]  M. Chiorboli,et al.  Comparison of analytical method, 3D finite element model with experimental subsidence measurements resulting from the extension of the Milan underground , 2009 .

[29]  Emilio Bilotta,et al.  Prediction of stresses and strains around model tunnels with adjacent embedded walls in overconsolidated clay , 2009 .

[30]  O. Zienkiewicz,et al.  An anisotropic hardening model for soils and its application to cyclic loading , 1978 .

[31]  Masahiro Maeda,et al.  Use of compact shield tunneling method in urban underground construction , 2005 .

[32]  TanYong,et al.  Measured performance of a 26 m deep top-down excavation in downtown Shanghai , 2011 .

[33]  R. K. Rowe,et al.  A theoretical examination of the settlements induced by tunnelling: four case histories , 1983 .

[34]  R. Peck.  Deep excavations and tunnelling in soft ground , 1969 .