Predicting the overall horizontal bearing capacity of jack-up rigs using deck–foundation–soil-coupled model

Abstract

The overall bearing capacity of a jack-up rig under horizontal load is conducted using finite element models that consider the deck–foundation–soil interaction. In these models, the simplified horizontal load acts on the deck and increases until the platform loses its stability. The effects of the self-weight of the platform W and load direction α on the ultimate horizontal bearing capacity Hult are investigated, and W- Hult failure envelopes under different α conditions are obtained. Two typical seabed types, including the double-layer seabed of sand overlying soft clay and the single-layer seabed of sand, are considered. The results show that a critical self-weight Wcritical exists in the double-layer seabed. Based on Wcritical, the failure of the platform presents two different modes. When W < Wcritical, the windward leg is pulled up, and Hult increases with the increase in W. When W > Wcritical, the failure mode is the leeward leg or legs puncturing the bearing sand layer, and Hult decreases with the increase in W. In the single-layer seabed, the failure mode is the windward leg being pulled up, and Hult increases with the increase in W throughout the whole range. The W- Hult envelopes in these two types of seabeds are basically the same when W < Wcritical.

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

“…It has very large deformation characteristics, which can effectively limit the generation and development of cracks [ 4 ]. In addition, Yin et al also studied the repair and reconstruction of the old pavement, combined with the construction of geosynthetics, paved the middle crack prevention layer, made full use of the reinforcement, isolation, drainage, and filtration functions of geotextiles, extended the service life of the road, and maintained and repaired the existing urban roads more economically [ 5 ]. In their research on the application and construction of geosynthetics in hydraulic engineering, Ren et al found that impervious geosynthetics are often damaged by stones or other sharp objects, and the membrane will also be damaged by the jacking force of gas or liquid.…”

Risk-based integrity model for offshore pipelines subjected to impact loads from falling objects

“…Thus, the coupled Eulerian-Lagrangian (CEL) method, which is widely used in geotechnical analysis, was introduced to establish the FEM model. [28][29][30] The traditional Lagrangian and Eulerian elements are involved and coupled in a CEL model. During the analysis, the Eulerian meshes were kept fixed in space, and the soil material moved freely through those meshes and could be traced using a Eulerian volume friction (EVF) tool.…”