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A 3D spatio-temporal fluctuation analysis method for seismic safety assessment of tunnels

A space-time fluctuation and analysis method technology, which is applied in the field of tunnel seismic safety assessment and three-dimensional space-time fluctuation analysis, can solve the problem that the quasi-static method cannot fully consider the time, frequency and amplitude of earthquake motion, so as to improve safety and clarify physical effect

Active Publication Date: 2021-02-26
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is: in order to solve the problem that the quasi-static method in the standard method cannot fully consider the time, frequency and amplitude of the earthquake, and propose a three-dimensional space-time fluctuation analysis method for tunnel earthquake safety assessment

Method used

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  • A 3D spatio-temporal fluctuation analysis method for seismic safety assessment of tunnels
  • A 3D spatio-temporal fluctuation analysis method for seismic safety assessment of tunnels
  • A 3D spatio-temporal fluctuation analysis method for seismic safety assessment of tunnels

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Embodiment 1

[0046] Example 1, please refer to Figure 1-12 , the present invention relates to a new type of three-dimensional space-time fluctuation analysis method for tunnel safety assessment, especially for overcoming the problem that the quasi-static method in the standard method cannot fully consider the time, frequency and amplitude of earthquake motion, the specific operation Process such as Figure 7 shown.

Embodiment 1

[0047] Embodiment 1: A novel three-dimensional spatio-temporal fluctuation analysis method for tunnel safety assessment, taking the Wenchuan #1 tunnel destroyed in the 5.12 Wenchuan Earthquake as an example, including the following steps:

[0048] Step 1: If Figure 8 , to generalize the calculation and analysis model of the mountain tunnel;

[0049] Step 2: If Figure 9 , input Wenchuan Wolong seismic wave, carry out EEMD analysis, the signal is the acceleration signal.

[0050] Step 3: If Figure 10 , according to the EEMD analysis results, a full-time frequency analysis is carried out;

[0051] Step 4: If Figure 12 , using equations (9)-(11) to calculate the axial force distribution on the inner surface of the lining under the action of input seismic waves

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Abstract

The invention discloses a three-dimensional space-time fluctuation analysis method for tunnel safety assessment, which uses three-dimensional space-time fluctuation analysis to solve the safety factor of the tunnel lining at any position and at any time, that is, input the safety evaluation wave near the site, and solve the tunnel under the action of a strong earthquake The fracture angle and pressure of the surrounding rock can be used to determine the safety factor of the tunnel lining at any position and at any time. The invention solves the safety factor of the tunnel lining by using the nonlinear wave theory and the layered shear analysis method, which can effectively overcome the problem that the quasi-static method in the standard method cannot fully consider the time, frequency and amplitude of the ground motion, and has the advantages of clear physical meaning. The method of the invention is real-time and comprehensive, can obtain a tunnel safety factor closer to the actual one, and can be effectively applied to the design and construction of the tunnel.

Description

technical field [0001] The invention relates to the technical field of seismic wave detection, in particular to a three-dimensional space-time fluctuation analysis method for earthquake safety assessment of tunnels. Background technique [0002] Seismic force has a significant impact on the safety of tunnel structures, and the seismic design of tunnel structures cannot be ignored. At present, the domestic "Code for Seismic Design of Railway Engineering" (GB50111-2006), "Code for Seismic Design of Highway Engineering" (JTG D70-2004) and "Code for Design of Metro" (GB50157-2003) all use seismic coefficient method. In recent years, experts and scholars at home and abroad have gradually developed numerical analysis methods, response displacement methods, reaction acceleration methods and other quasi-static methods or time-history analysis methods. However, the existing methods have the following defects: [0003] (1) The three elements of seismic waves cannot be considered sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q10/06G06Q50/26G06F119/14
CPCG06Q10/06393G06Q50/265
Inventor 杨长卫童心豪张良王强
Owner SOUTHWEST JIAOTONG UNIV
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