Deepwater thin-wall steel cylinder stability prediction method

Abstract

The invention discloses a deepwater thin-wall steel cylinder stability prediction method which comprises the following steps: firstly, establishing a steel cylinder simulation analysis model according to seabed geological condition parameters and steel cylinder condition parameters, and establishing a function relationship among the seabed geological condition parameters, the steel cylinder condition parameters and limit loads; then collecting dynamic stress data generated by periodic displacement of the steel cylinder on the seabed soil body under the action of the wave cyclic load, obtaining test data of the weakening range and weakening strength of the seabed soil body under the same dynamic stress level through an indoor test, and establishing a correlation function of the test data and the wave cyclic load; then, according to the weakening range and weakening strength test data of the seabed soil body, calculating the corresponding bearing capacity of the weakened seabed soil body, carrying out inversion calculation to obtain equivalent seabed geological condition parameters, and then calculating a limit load attenuation coefficient corresponding to the equivalent seabed geological condition parameters; and finally, combining the ultimate load attenuation coefficient and the obtained function relationship to obtain a prediction model of the ultimate load of the steel cylinder under the action of the wave cyclic load.

Description

technical field [0001] The invention belongs to the field of in-situ stability design of a deep-water steel cylinder, and in particular relates to a stability prediction method for a deep-water thin-walled steel cylinder. Background technique [0002] As a new type of offshore structure, the plug-in cylindrical structure has the advantages of low cost, short construction period, and strong stability, and is widely used in the engineering practice of artificial island construction. A large amount of engineering experience and research shows that the working mechanism of the plug-in steel cylinder structure is complex and cannot be considered simply as a gravity type, and its stability is significantly affected by factors such as the seabed, waves, and internal packing. [0003] In previous domestic and foreign engineering practice, in order to prevent the instability of the steel cylinder, the anti-instability design of the steel cylinder can only be carried out with the help...

AI Technical Summary

Problems solved by technology

However, during the steel cylinder construction process, the hydrological conditions of the steel cylinder construction site are constantly changing, and the anti-instability ability of the seabed foundation under wave cyclic loads is also constantly changing, and it is difficult to accurately evaluate the impact of these changes on the steel cylinder in the early design. The influence of the stability of the cylinder, resulting in the potential risk of instability of the steel cylinder

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