Meitan kexue jishu (May 2023)
Research on the interpretation method of channel waves for various abnormal bodies in geologically transparent working faces
Abstract
The transparency of mine geology is a new requirement for safe and efficient mining of coal mines. For working faces with complex geological conditions, channel wave detection technology is one of the commonly used geophysical prospecting methods. If there are multiple geological anomalies on the working face, its attributes cannot be accurately determined. Distinguish and explain. Taking a working face in Yangquan, Shanxi as an example, a three-dimensional wave field simulation was carried out on a working face including faults, collapsed columns, thin coal belts, and deflection. Analysis of dispersion characteristics; combined with the numerical model of the longitudinal wave amplitude and velocity, shear wave amplitude and velocity, high-frequency groove wave amplitude and velocity, and low-frequency groove wave amplitude and velocity 8 types of CT inversion imaging, the fault, collapse column, thin different response characteristics of four geological anomalies, coal belt and flexure, on channel wave attributes. The results show that: ①The main frequency and velocity of the channe wave anomaly caused by the fault is basically the same as that of the coal seam without geological anomaly. The amplitude of shear wave, high frequency and low frequency channe wave can significantly identify the fault, and the speed of shear wave, high frequency channe wave and low frequency channe wave can be compared. Significantly identify faults, the longitudinal wave amplitude and longitudinal wave velocity cannot effectively identify the fault; ②The single shot characteristics of the collapsed column are characterized by low-order weakening and high-order enhancement. The amplitude of shear wave, high frequency, and low frequency channe wave can significantly identify the collapsed column, shear wave, and high frequency. The frequency slot wave velocity can identify the collapse column more significantly, while the longitudinal wave amplitude, longitudinal wave velocity and low frequency slot wave velocity cannot effectively identify the collapse column; ③The main frequency of the thin coal belt is basically unchanged, the speed is reduced, the high frequency slot wave amplitude and velocity, low frequency The amplitude and velocity of the channe wave can distinguish thin coal belts, the amplitude of longitudinal wave and transverse wave can distinguish thin coal belts significantly, and the amplitude of longitudinal wave and transverse wave cannot effectively identify thin coal belts; ④The amplitude of the deflection spectrum is enhanced, and the high frequency channe The wave amplitude and the low-frequency groove wave amplitude can distinguish the deflection more significantly, and the other properties of the groove wave are not obvious in the recognition of the deflection. According to the response characteristics of different geological anomalies on single shot, frequency dispersion, frequency spectrum and wavefield CT imaging, the geological recognition of channe wave anomalies is realized, and the shape, location and size of various geological anomalies are accurately explained, which is geologically transparent. The establishment of the chemical working face laid the “material” foundation.
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