Abstract: In the purpose of studying the seismic behavior of pressure-type cable in weak rock and soil under earthquake more accurately, the expressions of prestress and prestress loss under the coupling effect of prestress of anchor rope and creep of rock and soil mass were derived based on the material relaxation of steel strand subjected to long-term load. Furthermore, the expressions of equivalent compressive stress and equivalent shear stress of the anchorage segment of pressure-type anchor cable under circular uniform load were derived using pseudo-static method, Mindlin basic solution and integral simplification method. Case study demonstrated that the loss of prestress was large in the initial stage, stabilized in mid-stage and changed little in later stage, with the loss rate declining consistently. The equivalent stress of mortars in anchorage segment concentrated mainly within 0.5 m from the pressure plate. The maximum equivalent stress was in 0.1 m from the pressure plate rather than on the contact surface between pressure plate and mortars. The research findings enriched the theoretical research in regards to seismic design of pressure-type anchor cables, and offered some references for the reasonable seismic design of slope strengthened with pressure-type cable.

Key words: pressure-type cable, coupling effect, seismic performance, pseudo-static method, Mindlin basic solution