Testing system simulating ultimate dynamic bearing capacity of cyclic load lower plate anchor

Abstract

The invention provides a testing system simulating the ultimate dynamic bearing capacity of a cyclic load lower plate anchor. The testing system comprises a plate anchor model, a cross-shaped supporting frame, a cyclic loading device and a measuring device, wherein the cross-shaped supporting frame is used for limiting an anchor shank of the plate anchor model to move perpendicular to the seabed surface. The cyclic loading device is used for exerting cyclic loads on the anchor shank and comprises a transmission device, a cyclic load and displacement load converting device and a displacement correcting device, the transmission device is used for converting constant-speed rotation input by a motor into sine simulating reciprocating rotation, the cyclic load and displacement load converting device is used for converting the reciprocating rotation into superposition of appointed constant loads and sine simulating loads, and the displacement correcting device is used for adjusting the length of a rope according to the displacement of the plate anchor model so that it can be avoided that the amplitude of the cyclic loads is attenuated due to the displacement accumulation of the plate anchor model in multiple periods. The amplitude of the cyclic loads can be effectively controlled, pore water pressure of a soil body around the plate anchor in the circular drawing process is obtained, the destroying process of the plate anchor and the soil body around the plate anchor is directly observed, and the ultimate dynamic bearing capacity of the cyclic load lower plate anchor is reasonably evaluated.

Description

technical field [0001] The invention relates to marine engineering technology, marine soil mechanics and marine foundation engineering technology, in particular to a test system for simulating the ultimate dynamic bearing capacity of plate anchors under cyclic loads. Background technique [0002] As the mooring foundation of a new type of deep-sea engineering structure (including towed plate anchors, new normal bearing anchors, and suction penetrating plate anchors), plate anchors need to be embedded in the seabed soil to a certain depth to provide uplift bearing performance. Its bearing capacity can reach more than 100 times the anchor's own weight, and it has the advantages of material saving, easy operation, easy storage, recyclability and repeated use. It is used in the mooring positioning of large floating offshore platforms and floating offshore wind farms Widespread concern. [0003] Due to the extremely complex and harsh marine environmental conditions, plate anchor...

AI Technical Summary

Problems solved by technology

At present, there are only a few conventional model tests and centrifuge tests for the experimental research on the cyclic bearing characteristics of plate anchors, and there are the following key problems: (1) It is difficult to maintain a constant amplitude of the cyclic load; (2) It is difficult to obtain the cyclic drawing process The pore water pressure of the soil around the plate anchor; (3) The failure process of the plate anchor and its surrounding soil cannot be directly observed, etc.

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