An evaluation method for sliding piles on offshore platforms considering risk classification

A technology of risk level and offshore platform, which is applied in the field of offshore platform slide pile assessment by level division, and can solve problems such as inability to consider influencing factors

Active Publication Date: 2020-02-07
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that it cannot take into account the complex influencing factors that cause sliding piles

Method used

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  • An evaluation method for sliding piles on offshore platforms considering risk classification
  • An evaluation method for sliding piles on offshore platforms considering risk classification
  • An evaluation method for sliding piles on offshore platforms considering risk classification

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Experimental program
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Embodiment Construction

[0027] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are exemplified, and detailed descriptions are provided in conjunction with the accompanying tables.

[0028] A method for assessing slide piles on offshore platforms considering the division of risk levels of the present invention comprises the following steps:

[0029] First, divide the risk level of sliding piles, which can be divided into 3-5 levels from good to bad. Here, it is divided into three levels: high, medium and low.

[0030] Then, an evaluation index system is established, and each evaluation index is divided into risk grades. The number of risk grades divided by each evaluation index is equal to the number of risk grades of sliding piles. A total of 9 evaluation indicators belonging to the five categories of standards are determined here, and each evaluation indicator is divided into three grades of high, medium and low accor...

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Abstract

The invention discloses an assessment method of pile sinking of ocean platform taking consideration of risk level classification. The method includes the following steps: classifying risk levels of pile sinking; establishing a system of assessment indexes and classifying the risk levels for all the assessment indexes, confirming the comparison matrix and using the average and range method to construct the judgment matrix to determine the weights of all the assessment indexes, determining the membership grade of each risk level for each assessment index, establishing a fuzzy mathematical model to solve the fuzzy vector of the pile sinking risk level for the ocean platform and based on the principle of the largest membership grade making the assessment about pile sinking risk level of the ocean platform. The invention provides an assessment method based on AHP and fuzzy mathematical theory, applies the method of risk levels classification to give an assessment to the pile sinking of ocean platforms. The assessment results are more close to the actuality. The method is suitable for the assessment of pile sinking risks of ocean platforms.

Description

technical field [0001] The present invention relates to a method, more specifically, relates to a method for evaluating offshore platform sliding piles considering risk level division. Background technique [0002] Sliding pile refers to the phenomenon that when a pile penetrates into some weak soil layers, it sinks for a long distance under a small number of hammering or only relying on the weight of the pile hammer. With the gradual development of offshore oil and natural gas development to the deep sea, the driven piles in the deep sea foundation structures show the characteristics of large diameter and super length. Due to the improvement of transportation and hoisting capacity, the installation of the pile foundation no longer adopts the traditional segmental fabrication and installation, but piles are formed at one time, and the weight of the entire pile can reach more than 7000kN. The weight of pile hammer used is also increasing simultaneously (as hydraulic hammer I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/27G06N7/02
CPCG06F30/20G06N7/02
Inventor 张树德许文兵康思伟孙红军李飒曲俊生孙振平尹蒋松薛海林
Owner CHINA NAT OFFSHORE OIL CORP
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