Study And Application Of The Combining Inversion By Elastic Wave Of Parameters In The Mine Tunnel

To improve the resolution and interpretative precision of laneway seismic tomography is an evergreen topic. Making use of combining velocity and attenuation tomography more improve geological explanation of effect. In this thesis, combining velocity and attenuation tomography is to rebuild medium velocity and attenuation factor images using seismic first arrival travel time and the frequency shift method's attenuation. The motive of developing multi-parameters tomography combining velocity, attenuation factor,steam seismic eigenvalue,Poisson's ratio, elasticity's modulus etc. is to improve image resolution and geological explanation of precision .And also it puts up multiattributes of drawing layer efficiently contrast by ourselves compiling software processing system of seismic waves CT. Practical exploration and appliance in the working face of excavating coal make know that combining inversion by elastic wave of multi-parameters gain well effect on geological structure and its anomaly. The main researching contexts are as follows.Combining velocity and attenuation tomography study. Attenuation tomography could not only improve laneway seismic tomography but also expand image information and boost up understand on geo-structure and physical characters distributing in studied area and improve image resolution and precision, in this thesis, by application of reconstructing the laneway seismic attention tomography based on the velocity tomography, we can overcome the localization of a single physical property inversion, according obtain more all-around information about the geological structure and physical properties distribution of the laneway zone. Contrast and study on the four representative methods of the laneway seismic attention tomography (first wave amplitude attenuation, pulse broadening attenuation, logarithm spectrum attenuation, centroid frequency shift attenuation). Conclude that centroid frequency shift attenuation is best of suitable for laneway seismic tomography.By numerical modeling and engineering practice,this paper presents a king of laneway seismic tomography technique different from the traditional ones.That method traces the ray path and calculate the first arrival between each source and every receiver on the fine grid to improve the computing precision. And then, it applies the inversion algorithms on the coarse grid in order to guarantee every image element having enough rays passed through to improve imaging effect.The reflection excursion tomography technique is suitable to determine the lateral velocity variation in the working face of excavating coal. Abundant of engineering practice demonstrate that the method is superior to the conventional ones.Practical laneway seismic wave tomographic software processing system study. Study on laneway seismic tomography combining velocity and attenuation, A higher resolution software package is developed. It offers single method inversion or combining inversion in velocity CT and attenuation CT. And man-machine interaction is very well.