Abstract: Through field tests， the coupled creep behavior of the steel frame-anchor cable-rock and soil mass is revealed， and the creep model and the anchoring force loss calculation model of anchor cable under the coupling effect of the support system are established. In addition， a calculation model of equivalent creep stiffness damage in the process of anchoring force loss is constructed based on the creep damage theory. The research results demonstrate that increasing the length of the anchorage section within the effective anchorage length range of the tensile anchor cable can improve its creep resistance in silty soil. Meanwhile， the compression anchor cable can effectively reduce anchoring force loss due to the expanding effect of the anchorage section. Both the steel frame-anchor cable-rock and soil mass coupled creep model and the anchoring force loss calculation model show excellent calculation results. The equivalent creep stiffness loss model can effectively predict the loss state of equivalent creep stiffness and accurately describe the attenuation law of anchoring force.

Key words: anchor cables; coupled creep; anchoring force loss; calculation model; equivalent creep stiffness