It has presently been planned to change from the extraction to the reproduction, cultivation, of valuable species of fishes, mollusks, and algae. Such cultivation --mariculture --makes it possible to obtain products without depleting natural resources, to restore the balance of ecosystems which have arrived at a critical state due to clumsy or depradatory activities. The plantation cultivation of biological organisms is the most prospective direction in mariculture.It is customary to call the plantation structures hydrobiotechnical structures (HBTSs) [1]. The HBTSs are located near the coast at depths from 2 to 50 m, forming plantations with an area of several tens and hundreds of hectares. Flexible HBTSs made of synthetic ropes have become most widespread, since they are the most economical and make it possible to create a high level of mechanization of the production processes, and at the same time the conditions of the vital activity of the organisms are maximally close to the natural ones. Flexible HBTSs are spatial rope systems kept in the water column by a system of floats and weights (vertical retaining system) and within a given region of the plantation by anchors (horizontal retaining system).The main characteristic of HBTSs is the substantial mobility of its elements subjected to the effect of wave, gravitational, and wind loads, currents, and technological loads when servicing the plantations. In magnitude, the brief loads exceed the permanent ones many times. As a consequence of such loads, the elements of the structure change position and configuration in time and space. The movements of the elements are commensurate with their dimensions. The internal forces in elements of the structure vary in conformity with the laws of variation of the effects on the structure.As the experience of operating flexible structures under conditions of the Far East shows, the main failures of mariculture plantations occurred due to failures of the anchor system. This is one of the most vulnerable places of HBTSs. Gravitytype anchors holding the structure due to their own weight are traditionally used at plantations. However, during storms migration of the bottom sediments causes movement of the anchors to considerable distances, movements up to 40 m and more have been noted, which entails overstressing and breaking of the anchor guys, tangling and breaking of the supporting elements, and ultimately failure of the entire structure.The most rational and economical for HBTSs are anchor systems involving the soil in work, particularly pile anchors [2, 3]. From the viewpoint of providing reliability of the structure, the main requirement imposed on anchors is the provision of the strength of fastening of the anchor in the ground. Since the movements of the frame of flexible structures are considerable, the deformations of the anchor--foundation system does not affect the work of the entire structure, does not worsen the conditions of its service as for rigid structures, and does not lead to a decrease of its strength. As ...