Reflective trough wave advance detection method for coal roadway excavation along floor or roof of thick coal seam

Abstract

The invention discloses a reflective trough wave advance detection method for coal roadway excavation along floor or roof of thick coal seam According to the detection method, explosives in a coal seam hole at the position on the head-on tunnel surface of the excavated coal roadway with a distance of 1 / 4 coal thickness from the floor or roof of the coal seam is taken as a shot point for trough wave epicentre excitation, two columns of linearly-arranged detectors are arranged in the coal seam hole at the position on two side coal walls of the excavated coal roadway with a distance of 1 / 4 coal thickness from the floor or roof of the coal seam, and explosion of the explosives is artificially stimulated to generate Rayleigh trough waves propagating into head-on surrounding coal seams of the excavated coal roadway; the reflective Rayleigh trough waves are received by the two detector columns on both sides of the coal roadway, energy and waveform correlation coefficient calculation of the reflective Rayleigh trough waves is carried out, the location of the geological structure interface in the surrounding coal seams of the excavated coal roadway is determined through comparison, so the purpose of the geological structure in the head-on front of the coal roadway and the coal seams at the two sides during excavation along the roof or the floor of the thick coal seam is realized.

Description

technical field [0001] The invention relates to a geological detection method, in particular to a method for advance detection of thick coal seams along the floor or roof of a coal roadway and in front of a geological structure reflecting Rayleigh channel wave seismic. Background technique [0002] my country's thick coal seam production accounts for about 45% of the total raw coal production, much higher than the world average of 15%. At present, my country mainly adopts layered mining, top-coal caving mining and large mining height mining methods for thick coal seams. The three coal mining methods all require the coal roadway to be excavated along the floor or roof of the thick coal seam, and the center of the thickness of the coal seam is often not exposed, or the height of the center of the thickness of the coal seam from the floor of the roadway is too high ( figure 2 ) or too low. Because the energy of the Love channel wave is the largest at the center of the coal se...

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Problems solved by technology

Due to the barrier of the roadway, it is difficult for the channel wave to propagate to the coal seam on the other side of the roadway, so the structure in the coal seam on the other side of the roadway cannot be effectively detected ( Figure 5 )

[0006] 3) The existing advanced detection method of the geological structure of the coal roadway is to excite the seismic source on the coal wall of the roadway, and the incident channel wave propagating in the head-on direction will produce reflected waves on the head-on face and lose the energy of the incident channel wave ( Figure 5 ), so it is difficult to effectively detect the geological structure directly in front of the roadway

[0007] 4) The existing advanced detection method of the geological structure of the coal roadway is to shoot multiple points on the roadway wall to stimulate the seismic source, which not only increases the safety hazard but also increases the construction cost, and at the same time prolongs the construction time

[0008] 5) The existing advanced detection method of the geological structure of the coal roadway is to receive the reflected Love channel wave for advanced detection. When received by the coal wall of the roadway, the energy of the reflected Love channel wave is weak and is interfered by the strong energy roadway wall wave, so it is difficult to extract and identify Impact( Figure 7 )

(3) Under the same geological conditions, the reflective seismic advanced detection method is applied, and the energy of the reflected seismic wave that marks the existence of a small structural plane in front of the coal roadway is relatively weak, and is interfered by the strong reflection waves from the coal roadway roof, floor interface and coal mining face. Difficult to identify in seismic records

However, the paper did not propose a clear detection device and reflection Rayleigh channel wave data processing and structural interpretation methods

Moreover, the research results of the thesis are based on the full coal seam roadway excavation model, and there is a lack of research on the reflection channel wave advanced detection method, data processing and interpretation method for thick coal seam roadway excavation along the coal seam floor or roof

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