Channel Wave Seismic Exploration And Numerical Simulation Of Dispersion Curve

Seismic exploration is a common geophysical exploration method.It is based on the fact that there is a certain elastic difference between the detected target geological body and the surrounding rock.The instrument collects and analyzes the variation and propagation law of the artificially excited seismic wave in the study area,which can be solved.Certain problems.When the general method of seismic exploration is applied to coal mining,the difference between the coal field and the ground will cause the seismic wave to increase rapidly with the propagation distance,and the high-frequency components will rapidly attenuate and the multiple-wave interference between the layers will occur.Therefore,it is necessary to find a new and effective detection technology to become the focus of the coal industry.As an important energy source in China,coal has been increasing in recent years.However,due to the complicated geological structure of coal fields in China,if the geological conditions cannot be proved in the mining process,it will cause some disturbance to the mining process.Slot-wave seismic exploration,which can effectively detect local small structures,anomalous bodies and coal seam thickness changes,has emerged as the times require,and it seems to have a very high development prospect.Slot wave seismic exploration uses the dispersion characteristics of the groove wave to invert the structural characteristics of the coal seam.In order to study the certain law of the dispersion curve of the groove wave,the Rayleigh model is simulated by the numerical simulation method of seismic wave field.The research and analysis by numerical simulation results have certain guiding significance for guiding the seismic exploration inversion of the groove wave.The numerical simulation of seismic wave field can be divided into integral equation method,ray tracing method and numerical solution of wave equation.As the main method of numerical solution of wave equation,finite difference numerical simulation method is widely used because of its high computational efficiency,high precision and suitability for isotropic media.In this paper,the stress-wave velocity wave equation,time second-order,spatial eighthorder precision finite difference numerical simulation method is used to simulate the propagation law of Rayleigh-type groove wave under different medium parameters,and then the dispersion curve is extracted.Based on the previous work,this paper establishes the wave equation,deduces the difference approximation of the eighth order space in the second-order space of the wave equation,and gives the difference scheme of the rule grid of the uniform medium elastic wave equation,and deduces and analyzes the high-order difference interleaving in detail.The solution and implementation process of the stress-wave velocity equation under the grid,the other problems in the numerical simulation process are preliminarily discussed,and the model is established for trial calculation.Based on the group velocity and phase velocity of the slot wave,the dispersion characteristics of the slot wave are analyzed.On this basis,the numerical simulation of the "surrounding rock-coal-surrounding rock" model with different media parameters is carried out.The dispersion curves of Rayleigh-type groove waves are extracted and the results are analyzed.The thickness of the coal seam is Rayleigh-type groove wave frequency.The dispersion curve has a great influence,and the influence of other parameters on the Rayleigh-type groove wave dispersion curve is discussed in detail.Combined with the actual data verification,the dispersion curve of Rayleigh-type groove wave is in good agreement with the actual situation in the case of two-dimensional simulation,which has certain guiding significance for practical work.