Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design

An immersed tunnel and seismic design technology, applied in the field of underwater tunnel engineering, can solve problems such as the inability to simulate shear bonds and Gina waterstops, the inability to accurately calculate the spring-mass model, and the inability to simulate hydraulic crimping of immersed tunnels. , to achieve good engineering practicability and meet the effect of computational efficiency

Inactive Publication Date: 2012-07-11
TONGJI UNIV +1
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Problems solved by technology

[0004] The existing spring-mass model cannot simulate the hydraulic crimping of immersed tube tunnels, the existing spring-mass model cannot accurately calculate the force and opening of the joints, and the existing spring-mass model cannot simulate the shear bond and Gina stop. Insufficient water strips and the disadvantages of high calculation cost of the full three-dimensional refined model, the purpose of the present invention is to provide a three-dimensional simplified modeling method for immersed tunnels

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  • Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design
  • Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design
  • Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design

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Embodiment Construction

[0039] Below in conjunction with the accompanying drawings and embodiments, based on the general finite element software ABAQUS, the specific implementation of the present invention will be further described in detail.

[0040] Step 1: Structural analysis of the tunnel structure to be designed, including: determining the geometric position of its axis, the buried depth of the tunnel, and the distribution of surrounding soil layers. The part of the tunnel to be constructed by the buried pipe segment method is taken as the modeling range.

[0041] Such as figure 1 As shown, the immersed tunnel model includes pipe joint 1, foundation spring 2, sticky pot 3, sliding unit 4, shear key 5, Gina waterstop 6 and other parts.

[0042] Step 2, such as figure 1The control nodes that define the immersed tunnel model are shown. The control nodes include three parts: nodes on the axis of the pipe joint, nodes of the foundation spring and sticky pot used to simulate soil behavior, and node...

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Abstract

The invention discloses a three-dimensional fine modeling method for an immersed tube tunnel. The method comprises the following steps of: performing structural analysis on the immersed tube tunnel to determine the part needing modeling; defining a node on the axis of the immersed tube tunnel model; defining a unit required by the immersed tube tunnel model; defining material properties and interface attributes; defining the constraint relationship between the node simulating the joint part and the endpoint of the tube section; and assembling the components into an immersed tube tunnel model for calculation and analysis. The method disclosed by the invention can simulate the joint initial compression produced by water-power compression joint in the construction of the immersed tube tunnel, accurately calculates the stress and opening amount of the joint, and realizes the fine calculation of the joint part. The method disclosed by the invention sufficiently considers the requirement of analysis accuracy, meets the requirement on the calculation efficiency, and has good engineering practicability.

Description

technical field [0001] The invention belongs to the field of underwater tunnel engineering and relates to a modeling method that can be used for the seismic design of immersed tube tunnels. Background technique [0002] The immersed tube method is a new construction method developed in the early 20th century to build underwater tunnels. Due to its unique advantages, the immersed tube method has become the preferred construction method for underwater tunnel construction in recent years. In the longitudinal seismic analysis of immersed tube tunnels, whether the established 3D analysis model is suitable or not involves the efficiency of calculation and the reliability of the results. Therefore, a reasonable 3D model of immersed tube tunnels is very important for seismic analysis. [0003] In the past, most of the models used for seismic analysis of immersed tunnels used spring-mass models, and individual projects used full 3D refined models. Since the joints of immersed tube ...

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Application Information

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IPC IPC(8): E02D29/073
Inventor 陈之毅沈昊袁勇徐国平刘洪洲李贞新李毅付佰勇
Owner TONGJI UNIV
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