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Multi-objective optimization method for shield underneath existing tunnel construction based on GA-LSSVM and NSGA-II

A technology of multi-objective optimization and existing tunnels, which is applied in the field of multi-objective optimization of shield tunnel tunnel construction through existing tunnels, and can solve the problem that the intelligent optimization of shield tunnel tunnel construction parameters has not yet been involved, the research of complex engineering is limited, and the theoretical formula method problems such as poor accuracy, to achieve precise optimization, accurate prediction results, and objective results

Pending Publication Date: 2021-02-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

All the above methods are of certain value to the study of land surface subsidence, but the theoretical formula method is often only applicable to specific situations and has poor accuracy; numerical simulation is relatively convenient and fast but the accuracy is average; model test accuracy is high but the cost is high and the cycle is long. Engineering research is more limited
Therefore, the existing methods have a certain degree of defects, and the current research on the intelligent optimization of shield tunneling construction parameters for multiple objectives has not yet involved

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  • Multi-objective optimization method for shield underneath existing tunnel construction based on GA-LSSVM and NSGA-II
  • Multi-objective optimization method for shield underneath existing tunnel construction based on GA-LSSVM and NSGA-II
  • Multi-objective optimization method for shield underneath existing tunnel construction based on GA-LSSVM and NSGA-II

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[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0053] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, below in conjunction with the accompanying drawings, the project site data obtained from the Wuhan Metro Line 2 project under the Wuhan Metro Line 2 at the Zhongnan Road transfer station in rail transit is as follows: Examples further describe the method of the present invention.

[0054] Such as figure 1 , the present inv...

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Abstract

The invention relates to the technical field of shield underneath pass existing tunnel construction multi-objective optimization and discloses a shield underneath pass existing tunnel construction multi-objective optimization method based on GA-LSSVM and NSGA-II. The method mainly comprises the following steps of S1, collecting data of horizontal displacement and settlement displacement of an existing tunnel arch bottom based on shield construction parameters; S2, a GA improved least square support vector machine (GALSSVM) being adopted to establish a high-precision prediction model of horizontal displacement and settlement displacement of the arch bottom of the existing tunnel, and two regression prediction functions being obtained; and S3, taking the two nonlinear prediction functions asfitness functions, combining the application constraint conditions of the influence factors, and performing multi-objective optimization by utilizing NSGA-II to obtain an optimal mix proportion. By means of the established GA-LSSVM and NSGA-II model, high-precision prediction of arch bottom horizontal displacement and settlement displacement is achieved, and multi-target intelligent optimizationof shield construction parameters is also achieved.

Description

technical field [0001] The invention belongs to the technical field of multi-objective optimization for shield tunneling under existing tunnel construction, in particular to a multi-objective optimization method for shield tunneling under existing tunnel construction based on GA-LSSVM and NSGA-II. Background technique [0002] With the widespread rise of underground rail transit systems in my country, there are more and more shield tunnel construction projects in close proximity, and the biggest risk that may occur during shield tunnel construction is excessive ground level and settlement displacement. Therefore, in order to ensure the safety of subway tunnel construction and operation, it is very valuable to take reliable measures to control the horizontal displacement and settlement displacement within a safe and reasonable range. [0003] At present, a large number of domestic and foreign literatures study the influence law of tunnel proximity construction from the perspe...

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Application Information

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IPC IPC(8): G06F30/13G06F30/27G06F111/06
CPCG06F30/13G06F30/27G06F2111/06
Inventor 吴贤国陈虹宇陈彬冯宗宝覃亚伟徐文胜吴克宝杨赛田金科
Owner HUAZHONG UNIV OF SCI & TECH
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