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Abstract According to the wedge sliding failure of jointed rockmass slope under seismic loading，the safety factor calculation formulae of wedge sliding are given under different conditions，and the relationships among distance of normal stress action point，the safety factor of wedge sliding and the angle of shear stress and horizontal plane ，horizontal seismic factor ，the ratio of vertical seismic factor and horizontal seismic factor are analyzed. Its shows that， increases with ， increasing，but decreases with increasing；at the same condition of horizontal seismic loading，the safety factor of wedge decreases with ， increasing，but increases with increasing. Then the computation processes of the wedge sliding safety factor considering seismic influences in 3DEC are carried out，and two important steps in the compute process are given：the determination of the area of triangle，the volume of tetrahedron in 3D and the intersect line vector of two joint faces. Finally，an example is presented to explain the rationality of theoretical analysis.
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Received: 07 April 2007
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