The Research Of Concrete Debye Model Based On Differential Evolution Algorithm

In modern society, the traffic occupies a very important position in the national economy, and the concrete is one of the most widely used material in road construction. After completion of the large-scale highway construction, there are associated with the disease management during operation. The road surface water and collapse are the most common safety hazards of the road. Investigation and research report show a certain percentage of road disease such as seepage, leakage and subsidence phenomenon. They seriously threat the safety of roads, affect the quality of roads, shorten the maintenance period of highway transportation and service life. So the observation of the condition of concrete health is particularly important. Ground penetrating radar nondestructive testing technology as easy to use, fast detection and high resolution is the most popular. Ground penetrating radar is mainly to the acquisition of data preprocessing, then through artificial analysis to identify. It can determine the size of underground targets, depth and bearing characteristic parameters.The paper bases on the theory of propagation of electromagnetic waves in lossy and dispersion medium and applies ground penetrating radar to detect the dielectric characteristics of concrete. Establish mathematical model of conforms to the concrete structure and the observational data, then use differential evolution algorithm to optimize the parameters of the mathematical mode. Finite difference time domain method applies to Yee cellular space grid model and use the center difference quotient to instead of derivative, which makes spatial continuous variables discretize and the electromagnetic field normalize. We can solve Maxwell’s equations using the finite difference time domain method when initial values and boundary conditions are given. Maxwell’s equations summarize the basic properties of macroscopic electromagnetic field. They reveal the relationship between electric field and magnetic field, electromagnetic field and the charge. All macroscopic electromagnetic phenomenon Should follow Maxwell’s equations. In this paper, through numerical simulation software to simulate empty, water retention, reinforced concrete and disasters such as collapse problems and verify the correctness of the equations.The numerical simulation results show that firstly, this paper established the mathematical model of characteristic parameters of concrete is effective and the mathematicalmodel conform to the concrete itself structure characteristics and the observed data. Secondly,applying differential evolution algorithm to optimize parameters of model is feasible. Thirdly,using the finite difference time domain method to solve Maxwell’s equations is reliable. Lastly,based on Maxwell equations, the finite difference time domain simulates high frequency electromagnetic wave propagation in concrete media, and radar profile can accurate positioning the location of the buried, the characteristics of interface reflection wave and empty, blisters and reinforced buried the strength of reflection.