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Method for calculating bearing capacity of deep sea anchoring foundation under consideration of actions of anchor chain and soil body

A calculation method and technology of deep-sea anchors, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of inconvenient practical application of results, difficult visual display of results, and limited data.

Inactive Publication Date: 2012-10-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of carrying out the above experiments is very high, and the data obtained in the experiments are limited, which cannot reflect the influence of soil property changes on this process.
And the repeatability of the test is very difficult
Due to the complexity of the interaction between the soil and the anchor chain, there are obvious defects in the theoretical calculation method, which is not convenient for the practical application of the results, and the output results are not easy to display intuitively

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] specific implementation plan

[0013] The invention uses numerical simulation to simulate the mechanical performance of the anchor chain and its interaction mechanism with the soil, and proposes a set of simulation methods for simulating the interaction between the anchor chain and the soil. In the numerical simulation interface, the soil-the anchor chain and the anchorage foundation are split and processed. This method requires modeling and analysis of the anchor chain and the soil. The anchor chain goes deep into the soil and has a friction response with the soil. It is necessary to make a frictional contact interface between the soil and the anchor chain in the interface, so that the two can perform effective frictional fit. In the numerical simulation, the contact method is used to establish the friction contact interface, and the mutual influence relationship between the two is established. Then solve the mechanical response of the interaction between the anchor c...

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Abstract

The invention belongs to the technical field of offshore anchoring foundation moorage, and relates to a method for calculating the bearing capacity of a deep sea anchoring foundation under the consideration of the actions of an anchor chain and a soil body. The method comprises the following steps of: decomposing an anchoring system into an anchor chain-soil body interaction system and a suction anchor-soil body interaction system to obtain an anchor chain initial form equation, and establishing an initial state model of an anchor chain line which goes deep into a soil body; establishing an anchor chain-soil contact system; determining a relation between the load of a soil discharge end and the load of an anchoring end; establishing a co-acting model relation between the suction anchor and the soil body, and drawing a P-S curve of the suction anchor, i.e., the relation curve of force and displacement to obtain the destroy load of the suction anchor, i.e., the limit value of load at an anchoring position; and determining an anchoring limit load. According to the method, the physical response between the anchor chain which is put into soil and the soil body can be reflected clearly and directly, and extreme bearing capacities under different soil property operation conditions can be determined more accurately.

Description

technical field [0001] The invention belongs to the technical field of mooring of offshore anchor foundations, and relates to a method for calculating the bearing capacity of deep sea anchor foundations. Background technique [0002] In the current era and for a foreseeable period of time in the future, petroleum resources are still the main energy source, but the amount of onshore petroleum resources that can be exploited is decreasing day by day. Therefore, the speed of seeking petroleum resources from the sea is accelerating, especially the exploitation of deep sea petroleum. many. However, the operating conditions in deep sea are more complicated and there are many uncertainties. Deep sea oil platforms often need to be anchored during operation. The anchoring method is mainly to anchor the offshore platform with anchor chains or mooring cables. The stability of the upper structure can be increased by anchoring, and its adaptability to complex working conditions can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李飒吴蕴洲
Owner TIANJIN UNIV