Definition of Limit Displacements for Structures Made from Infilled Shells used in a Coastal Engineering (Review)

Abstract

A review is devoted to the question of designing offshore gravity structures made of cylindrical shells filled with ground. This article presents a review and investigation of the design criteria for cofferdam structures made from soil-filled shells. Based on a number of experiments on such structures, it is possible to make a statement about the allowable limit displacements, which governs the main principles of design criteria. The authors recommend, in addition to the general requirements for design criteria of the maximum displacements and the functional purpose of the structure (expressed in account of the features of the technological process of its operation), also determine the allowable displacements of the soil under the base of a structure with the subsequent allocation of the smallest (critical) values. To determine the limit displacements of the base for the initial stages of design, it is proposed to use the data of experimented stamp tests, which were conducted in the similar soil environment. As a criterion for determining the maximum settlement, it is proposed to consider the time of appearing the phase of plastic deformations in the ground soil.