Abstract：The cross-sectional internal force distribution and longitudinal dynamic response characteristics of tunnel through fault fracture zone under seismic load are studied with both dynamic numerical analysis and shaking table model test. Results show that：(1) The condition of surrounding rock is the important factor affecting the internal force of tunnel liner caused by earthquake. The worse surrounding rock conditions are，the more remarkable internal force caused by earthquake produce and the worse seismic performance represent. (2) In the transverse direction，the position of conjugate direction of 45° is the most unfavorable tunnel seismic position；and the maximum internal force in tunnel lining is at the position under different conditions of surrounding rock. (3) In the longitudinal direction，when the tunnel traverses the interface between surrounding rock and fault，the internal force in tunnel lining caused by earthquake increases rapidly. (4) When the tunnel is far from the fault along the longitudinal direction，the internal force of tunnel tends to be a steady value. The research results can provide reference for seismic fortification of tunnel through fault fracture zone.
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2012, Vol. 31 
