Ground-penetrating radar forward-modelling method based on FETD and FDTD coupling

A technology of ground penetrating radar and two-dimensional model, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as complex calculation formulas and inconvenient programming

Active Publication Date: 2018-11-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some scholars (Masoud & Abdolali, 2007 [14] , 2009 [15] ; Donderici & Teixeira, 2008 [16] ; Correia & Jin, 2006 [17] ) a

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  • Ground-penetrating radar forward-modelling method based on FETD and FDTD coupling
  • Ground-penetrating radar forward-modelling method based on FETD and FDTD coupling
  • Ground-penetrating radar forward-modelling method based on FETD and FDTD coupling

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Embodiment Construction

[0108] The application of the present invention to the typical disease model of tunnel lining will be described below as an example.

[0109] After many years of operation of the tunnel, due to factors such as changes in surrounding rock pressure, aging of lining materials, and reduction in strength, the lining cracked, and the lining fell off, peeled off, voided, and water leaked, which seriously threatened the safety of tunnel operation. The present invention is applied to carry out forward calculation on the lining incompact model, tunnel water leakage model, lining void model, lining crack and void model under the interference of steel mesh, so as to guide the ground penetrating radar data interpretation of the measured lining disease model.

[0110] 1.1 Tunnel not dense model diagram

[0111] In the process of tunnel construction, due to complex geological conditions, harsh construction environment, construction technology and other problems, the lining is not compacted. ...

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Abstract

The invention discloses a ground-penetrating radar forward-modelling method based on FETD and FDTD coupling. The method comprises the following steps: loading a two-dimension model parameter; dividinga ground-penetrating radar numerical simulation region into a model region and an extension region; splitting the model region by adopting an unstructured triangle unit, and splitting the extension region by using a regular grid; setting a measurement point, and loading an excitation source at a location corresponding to the measurement point; setting the components of the electric fields and auxiliary fields of all time before the initialization time step as zero, and updating the auxiliary field according to the FDTD auxiliary field time stepping formula, and updating the electric field according to the FETD main field time stepping formula so as to obtain the electric field value of the measurement point at each time step till to the maximum time step; and obtaining the ground-penetrating radar forward-modelling profile map according to the electric field values of all time steps at each measurement points. The method disclosed by the invention is high in fitting precision and fastin computation.

Description

technical field [0001] The invention relates to a ground-penetrating radar numerical simulation method in the field of geophysics, which is particularly suitable for fast and efficient forward modeling of models with irregular geometric features and complex distribution of physical property parameters. Background technique [0002] There are many numerical simulation methods for ground penetrating radar, including the finite difference method (Finite Difference Time Domain, FDTD) [1-3] , finite element method [4-5] , time-domain pseudospectral method [6] , symplectic block Runge-Kutta method [7] , time-domain discontinuous finite element (DGM) [8] , spline wavelet finite element and other algorithms [9] , these algorithms have their own characteristics. Among them, the finite difference time domain method has the advantages of direct time domain calculation, easy programming, saving storage space and computing time, and is favored (Irving&Knight, 2006 [10] ; Cassidy & ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 冯德山王珣张彬
Owner CENT SOUTH UNIV
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