Abstract
This paper presents the shear strain transmitting characteristics from the surrounding ground to the underground structure with rectangular cross section. In the current seismic design methods proposed for the underground structure, only the horizontal deformation is considered to evaluate the seismic shear deformation. This paper shows that considering the horizontal and vertical deformation and the rotation of the structure in the ground, the shear strain ratio depends only on the shear stiffness ratio between the ground and the structure, not on the other parameters including the cross section and the location in the ground. Finally, a simplified analytical method of the seismic deformation of the underground structure is proposed based on the shear strain transmitting characteristics.
