地震波对隧道的影响

nearly normal to the long axis of tunnel and resulting

, is related to the initial vertical stress by the coefficient of lateral earth pressure,

vertical and horizontal component of initial stress are

: Poisson's ratio The initial stress state presents gravity stresses of the

Figure-1 Deformation mode due to earthquake (after Owen and Scholl, 1981)

Figiure-1 3D-FEM mesh

Figure-2 Seismic displacement imposed at the

base

BOUNDARY CONDITION

,

in rock mass. The related engineering

properties, such as unit weight and Young's modulus,

and density

.The behaviour of the concrete inner lining is assumed

and unit weight The

seismic loading is applied at the base of the rock mass

Figure-4 Influence of seismic wavelength to

tunnel ling force

Figure-3 wave length in rock mass medium

properties and the size of tunnel diameter. For example, wave propagation through medium can be estimated

;

G: shear modulus, k : buck modulus , E : Young’s modulus, : total unit weight and g

fundamentals of physics, the

respectively. The p-wavelength and s-wavelength are around 542m and 125m, respectively

Figure-5 longitudinal displacement along the tunnel in short seismic wavelength Figure-6 longitudinal displacement along the tunnel in long seismic wavelength

the corresponding p-wave and shear wave speed are, The p-wavelength and s-wavelength are around 69m