The Study Of Transmission Wave Processing Technology In Coal Mining Working Face

Increasing complicated geological conditions of the coal seam structure, especially small structure is developed with the process of coal mining deeply. High-precision, high-resolution seismic wave CT detection technology is the future direction of development and good way to mine seismic exploration.In this paper, based on the full understanding of the seismic wave CT detection theory and its engineering application, analysis of the existing mine seismic wave CT detection technology. From two aspects of data preprocessing and imaging method for the mine laneway seismic wave CT detection key technology in a more detailed analysis, and numerical simulation data, physical simulation data and field data to validate the results of the study, the research proved necessity and applicability of research results. Specific contents of the thesis include(1)Proposed the delay correction method of working surface seismic wave CT detection. This paper analyzes the impact of system delay seismic wave CT detection data acquisition causes and characteristics and delay of inversion results, aiming at the working face of seismic wave CT observation system proposed delay correction method which can effectively eliminates the influence brought by the time delay.(2)A formula for the synthesis of different types of wave is given. This paper analyzes the defects of single component geophone acquisition data, demonstrates the necessity of multi-component data acquisition, based on the conventional surface seismic wave CT observation system and different types of wave motion characteristics and rules, it gives the highlight the different types of wave component synthetic formula.(3)Combined with the characteristics of the working face of seismic wave CT observation system, analysis and comparison of a variety of common ground filtering method and their application in seismic wave CT detection of effective wave extraction and vertical and horizontal wave separation.(4)Through the Back Projection Technique(BPT) calculation of initial model for inversion region, then calculated to determine the joint inversion method of the course of the correction amount of each grid cell inversion by the Simultaneous Iterative Reconstruction Technique(SIRT) algorithms. Proposed joint inversion method based on analysis and comparison of a variety of commonly used velocity tomography algorithms, summarize their advantages and disadvantages, and prove the superiority of the inversion method by the numerical simulation data, the physical model data and the field data.(5) According to the superposition principle of diffraction migration energy, diffraction migration imaging inversion method is applied to mine seismic wave CT detection imaging inversion, And for the propagation characteristics of diffraction-longitudinal wave diffraction-wave, P-SV converted-wave, SV-P converted waves and presented a detailed calculation method of different waves traveling in homogeneous and inhomogeneous media. And proved the advantages of good diffraction migration method convergence through numerical simulation data, physical model data of Multi-wave inversion(6)According to the principle and characteristics of pre-stack diffraction migration stack, to explore the pre-stack migration diffraction imaging method of observation system outside the coverage area of abnormal body reflect the situation.