Behavior of Ground and Response of Existing Foundation Due to Tunneling

ABSTRACT An apparatus has been developed to model the excavation of a tunnel in the laboratory. With this apparatus, 2D model tests are carried out to investigate the surface settlement and the earth pressure brought about by the tunneling. Finite element analyses using an elastoplastic subloading tij model are also conducted. The influence of volume loss on the surface settlement and the earth pressure, due to the shallow tunnelling, is illustrated based on the model tests and the corresponding numerical analyses. It is revealed that the surface settlement troughs and the earth pressure distributions around shallow tunnels depend on both the volume loss and the crown drift of the tunnel. The effect of the interaction between the tunneling and existing nearby foundations is also demonstrated in this paper. For existing foundations, the building loads control the surface settlements and the zone of deformation during the tunnel excavation. The behavior of the foundations depends on the deformation mechanism of the ground during the tunnel excavation. The induced axial force and bending moments in the piles of a piled raft are investigated numerically, and it is shown that the axial force changes due to the stress relaxation of the ground. Bending moments are induced in the piles at a lower value of soil cover due to the differential settlement of the piled raft.

[1]  元 松岡,et al.  “Stress-Deformation and Strength Characteristics of Soil under Three Different Principal Stresses” への討議 , 1976 .

[2]  Sakuro Murayama,et al.  EARTH PRESSURE ON TUNNELS IN SANDY GROUND , 1971 .

[3]  Teruo Nakai,et al.  INFLUENCE OF SURFACE LOADS AND CONSTRUCTION SEQUENCE ON GROUND RESPONSE DUE TO TUNNELLING , 2004 .

[4]  Teruo Nakai,et al.  A NEW MECHANICAL QUANTITY FOR SOILS AND ITS APPLICATION TO ELASTOPLASTIC CONSTITUTIVE MODELS , 1984 .

[5]  David M. Potts,et al.  The Influence of Building weight on Tunnelling-Induced Ground and Building Deformation , 2004 .

[6]  Teruo Nakai,et al.  3D AND 2D MODEL TESTS AND NUMERICAL ANALYSES OF SETTLEMENTS AND EARTH PRESSURES DUE TO TUNNEL EXCAVATION , 1997 .

[7]  M. Boscardin,et al.  Building Response to Excavation‐Induced Settlement , 1989 .

[8]  T. Nakai,et al.  A Simple Elastoplastic Model for Normally and Over Consolidated Soils with Unified Material Parameters , 2004 .

[9]  S. W. Jacobsz,et al.  Centrifuge Modelling of Tunnelling Near Driven Piles , 2004 .

[10]  Koichi Hashiguchi.  Constitutive Equations of Elastoplastic Materials With Elastic-Plastic Transition , 1980 .

[11]  Eunsu Sung,et al.  GROUND BEHAVIOR DUE TO TUNNEL EXCAVATION WITH EXISTING FOUNDATION , 2006 .

[12]  Robert J. Mair,et al.  SUBSURFACE SETTLEMENT PROFILES ABOVE TUNNELS IN CLAYS , 1993 .

[13]  Kalman Kovári,et al.  Suggested methods for determining the strength of rock materials in triaxial compression , 1978 .

[14]  R. Adrian.  Particle-Imaging Techniques for Experimental Fluid Mechanics , 1991 .

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

[16]  Teruo Nakai,et al.  STRESS-DEFORMATION AND STRENGTH CHARACTERISTICS OF SOIL UNDER THREE DIFFERENT PRINCIPAL STRESSES , 1974 .

[17]  K. Roscoe,et al.  ON THE GENERALIZED STRESS-STRAIN BEHAVIOUR OF WET CLAY , 1968 .

[18]  Daisuke Yamaguchi,et al.  3D effects on earth pressure and displacements during tunnel excavations , 2004 .

[19]  Yoichi Watabe,et al.  ONE-DIMENSIONAL COMPRESSION OF AIR-FOAM TREATED LIGHTWEIGHT GEO-MATERIAL IN MICROSCOPIC POINT OF VIEW , 2004 .

[20]  Teruo Nakai.  FINITE ELEMENT COMPUTATIONS FOR ACTIVE AND PASSIVE EARTH PRESSURE PROBLEMS , 1985 .

[21]  Feng Zhang,et al.  MECHANICAL BEHAVIOR OF PILE FOUNDATIONS SUBJECTED TO CYCLIC LATERAL LOADING UP TO THE ULTIMATE STATE , 2000 .

[22]  K. Hashiguchi,et al.  Constitutive equation of elastoplastic materials with elasto-plastic transition , 1980 .