A Multi-Factor Composite Early Warning and Forecast Method for Subgrade Sedimentation of Large-Scale Immersed Tubes in Offshore

A multi-factor, composite technology, applied in the direction of design optimization/simulation, special data processing applications, etc., can solve problems such as unreachable, and achieve the effects of accurate prediction accuracy, high calculation efficiency, and simple form

Active Publication Date: 2020-07-28
CCCC FHDI ENG +1
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Problems solved by technology

At present, none of the conventional forecasting techniques for silting at home and abroad can meet this requirement.

Method used

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  • A Multi-Factor Composite Early Warning and Forecast Method for Subgrade Sedimentation of Large-Scale Immersed Tubes in Offshore
  • A Multi-Factor Composite Early Warning and Forecast Method for Subgrade Sedimentation of Large-Scale Immersed Tubes in Offshore
  • A Multi-Factor Composite Early Warning and Forecast Method for Subgrade Sedimentation of Large-Scale Immersed Tubes in Offshore

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Embodiment Construction

[0060] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Taking the early warning and forecasting of sediment return to the foundation trench of the immersed pipe of the Hong Kong-Zhuhai-Macao Bridge as an example, the detailed description is as follows with the accompanying drawings:

[0061] The Hong Kong-Zhuhai-Macao Bridge connects Hong Kong Special Administrative Region to the east and Zhuhai City and Macao Special Administrative Region to the west. figure 1 ), will form a new road transportation channel connecting the east and west banks of the Pearl River. The design of the bridge adopts the combination of bridge, island and tunnel. The total length of the subsea tunnel is 5664m, and the construction is carried out by immersed tube method. The above are 1:2.5 and 1:5 respectively. There are altogether 33 pipe joints including E1-E33 in the immersed pipe foundation ...

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Abstract

Provided is a multi-factor combined warning and forecasting method for large-scale maritime immersed tube foundation bed back-silting. The method includes the steps of firstly, collecting information including tide predictions of a project, sediment concentration in actual measurement and the like; secondly, placing a back-silting box on a foundation trench and a foundation bed for observing a sediment accumulation rate; thirdly, applying a mathematical wave model and a three-dimensional mathematical tidal flow model to calculate the parameters of wave height, wave period, velocity of bottom wave motion and the like in a quasi-forecasting area; fourthly, building an equivalent formula of a tidal range (the formula is showed in the description), and obtaining the equivalent tidal range Re after calculation; fifthly, building a formula of sediment concentration (the formula is showed in the description); sixthly, building a formula of foundation trench back-silting thickness: Dep=lambada Re theta; seventhly, according to the formulas of sediment concentration and foundation trench back-silting thickness, forecasting sediment concentration S and foundation trench back-silting thickness Dep; finally, after accurate calculation, obtaining sediment accumulation thickness of every day and sediment accumulation thickness in accumulative total. By deducing high-precision computational formulas for calculating thickness of sediment accumulation on a foundation trench and a foundation bed, the multi-factor combined warning and forecasting method for large-scale maritime immersed tube foundation bed back-silting has the advantages that the forecasting time can be accurate to one day, and the precision can be accurate to a centimetre level, thereby improving the accuracy and timeliness of back-silting forecasting.

Description

technical field [0001] The invention relates to a high-precision early-warning and forecasting technology for sediment back-silting in deep foundation grooves and foundation beds of large-scale marine engineering structures, and in particular to a multi-factor compound early-warning and forecasting method for sediment back-silting in large-scale offshore immersed tube foundation beds. Background technique [0002] In the open sea area, subsea tunnel construction is generally carried out by immersed tube underwater butt joint construction method, which puts forward extremely high requirements on the flatness of the terrain at the joint of immersed tubes. 3 Under certain conditions, the thickness of sediment backsilting shall not exceed 4cm. Accurate measurement and evaluation of the value of sediment return to the foundation trench and foundation bed has become an important threshold for controlling the deployment of immersed tubes. [0003] At present, research methods such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 韩西军梁桁王汝凯杨华徐润刚解鸣晓黄玉新韩志远
Owner CCCC FHDI ENG
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