Study On Quantitative Analysis Seismic Response Of Channel Wave Of The Coal Seam Fault

As an important method for underground exploration in coal mines,slot wave exploration is particularly suitable for fault detection because of its advantages of strong energy and high signal-to-noise ratio.The detection of fault properties based on slot wave exploration has important research significance.Aiming at the fault structure models of typical coal seams with different properties,it is of great theoretical significance and practical value to carry out research on the reflection and transmission spectrum and energy characteristics of slot waves.In this paper,the theoretical analysis,numerical simulation,and field test are used as research methods to determine the best source of three-dimensional simulation,and to establish fault models with different inclination angles and different drops.Based on the high-order staggered grid finite difference algorithm,the three-dimensional numerical simulation is performed,and Contrast and analyze the spectrum and frequency dispersion characteristics of the simulated groove wave record,and study the characteristics of the reflected groove wave energy and the transmitted groove wave energy of different components of different types of faults.The research results are as follows:(1)In the three-dimensional numerical simulation of the channel wave,the source of the two-way parallel coal seam roadway is used,and the obtained channel wave is closest to the Love-type channel wave in the actual acquisition process.(2)In the reflection channel wave simulation,the inclination angle has no effect on the channel wave band width.The energy of reflected waves with a fault inclination angle less than 45 ° has little difference and it is difficult to distinguish.The fault wave energy with a greater inclination angle than 45 ° changes greatly.And higher energy.(3)Faults with different drop heights have an influence on the frequency band width of the reflection channel wave.Among them,the frequency band width of the X and Y component reflection channel waves increases with the increase of the fault.Is reduced.The energy of the reflected channel wave increases with the increase of the inclination angle,and increases from 1/8 times the coal thickness to 1 times the coal thickness as the fault drop increases.Minor reduction.At different incident angles and different frequencies,the energy changes below 1/2 coal thickness and above 1/2 coal thickness are different,and the inflection points of energy increase and decrease are also different.In the x component,faults less than 1/2 times the coal thickness have a larger response to 100-150 Hz frequency filtering.Coal thickness greater than 3/4 times has a larger response to the 150-200 Hz frequency filtering,and the amplitude of the decline is larger than that of other drop faults.(4)In the simulation of transmission channel waves,for faults with different inclination angles,the smaller the inclination angle is,the larger the transmission channel wave passes through the fault,the smaller the gap between the channel waves that do not pass through the fault.This indicates that faults with larger inclination angles are easier to identify.For faults with small dip angles,frequency filtering of 100-200 Hz can be used to reduce the energy of the channel waves passing through the fault and increase the energy difference of the channel waves on both sides of the fault,making the detection effect more accurate.(5)In the simulation of transmission slot waves,faults with a tilt angle greater than 45° have high transmission slot waves energy,which has obvious shielding effect on the slot waves and is easy to identify.For faults with small dip angles,frequency filtering of 100-200 Hz is used.By reducing the energy of the groove wave of the fault,the energy difference of the groove waves on both sides of the fault is increased,so that the detection effect is more accurate.(6)The three-component trough wave energy of the fault drop is less than 1/2 times the coal thickness drop fault at an incident angle of 0-30°,and the maximum and minimum energy of the three-component trough wave energy is greater than 1/2 times the coal thickness drop fault.When the incident angle is 0-30°,the difference between the maximum and minimum energy is small,and the energy is small.The greater the fall of the fault,the smaller the transmitted trough wave,and the energy will not increase,resulting in no fault can be detected,after 100-150 Hz frequency filtering can realize the identification of small drop faults.The dissertation has 71 pictures,13 tables,and 118 references.