Abstract: Pre-stressed anchor cables are widely used in tunnels, slopes and foundation pits. The loss of anchorage force affects the anchoring of pre-stressed anchor cable. The engineering accidents of anchorage failure often occur owing to the loss of anchorage force of pre-stressed anchor cable. The stress state of pre-stressed cable anchor is easily changed and anchor failure leads to engineering accident in water-affluent region. Based on the deformation data, this paper establishes a coupling constitutive model considering soil creep, anchorage force loss of pre-stressed anchor cable and seepage force. Then, the three-dimensional creep equation of soil and relaxation equation of anchoring force loss of pre-stressed anchor cables are deduced. Based on FLAC3D software, the corresponding procedure is developed to calculate and analyze the soil creep and anchoring force characteristics loss of the above mentioned foundation pit in coastal region. Combined with monitoring data, the above constitutive model is feasible and correct for analyzing anchoring force loss characteristics of pre-stressed anchor cables under seepage condition. The research results provide meaningful theoretical and practical guide for other similar projects.

Key words: creep, anchorage force, seepage, numerical simulation