A pit penetration layout method for improving the structure detection accuracy of the initial pressure area of a recovery working face

Abstract

The present application aims at providing a pit penetration layout method for improving the detection accuracy of the primary pressure area structure of the mining face, belonging to the technical field of coal mine geological detection, wherein a plurality of emission points and receiving points are arranged in the air inlet lane and the air return lane; only a plurality of emission points are arranged in the cut lane; the signals emitted by the emission points of the cut lane are received within the range of 0-200 m from the cut in the air inlet lane and the air return lane. The present application significantly improves the detection accuracy of the concealed structure (fault, collapse column) of the primary pressure area of the mining face by optimizing the layout position and adding emission points in the cut lane, providing accurate geological basis for the advanced support of the primary pressure area and safe mining, and has the advantages of reasonable structure, convenient layout and strong practicality.

Description

Technical Field

[0001] This invention belongs to the field of geological exploration technology in coal mine mining, specifically relating to a method for improving the accuracy of initial structural exploration of the pressure zone in the mining face. Background Technology

[0002] The initial pressure on a coal mine (the first large-scale collapse of the old roof) is the most dangerous stage of mine pressure during the longwall mining process. It directly determines the safety of the initial mining, the selection of support structures, and the subsequent cycle of pressure. It is a high-incidence period for roof accidents and requires precise control.

[0003] When mining begins at the working face, the main roof (old roof) of the coal seam fractures and collapses for the first time. The corresponding mining distance is called the initial pressure step distance. Geological structures (faults, collapse columns, etc.) can disrupt the integrity of the roof strata and alter the stress structure of the old roof. This disrupts the regularity of the initial pressure step distance, causing it to fluctuate, resulting in uneven pressure intensity and premature or delayed pressure arrival, ultimately leading to roof collapse accidents.

[0004] Accurate detection of the structural distribution within the initial pressure range allows for advance planning and the implementation of necessary measures. It also enables the estimation of the initial pressure step distance based on the structural characteristics, thus preventing potential roof collapse accidents. Currently, deep-sea drilling is the simplest and most efficient method for detecting the structural distribution in the longwall mining face.

[0005] Conventional tunnel penetration detection systems deploy transmitters and receivers in the intake and return airways, respectively. However, conventional deployment schemes result in large blind zones and excessively large areas of abnormal detection results, making it impossible to accurately determine the extent of the geological structure. This leads to significant deviations in the initial determination of the pressure range, affecting the safe mining operation. Summary of the Invention

[0006] This invention addresses the problems of existing tunnel penetration detection systems, such as large blind spots, excessively large abnormal areas in detection results, inability to accurately determine the structural range, and consequently, significant deviations in determining the initial pressure range, affecting the safe mining of the working face. It provides a tunnel penetration layout method to improve the accuracy of structural detection in the initial pressure zone of the mining face.

[0007] The present invention adopts the following technical solution: A method for using perforated pits to improve the accuracy of initial structural detection in the pressure zone of a longwall mining face includes the following steps: Several transmitting and receiving points are set up in both the intake and return air tunnels; During detection, the intake or return airway is used as the transmitting airway, and the corresponding return or intake airway is used as the receiving airway. During the signal transmission time of each transmitting point in the transmitting airway, the corresponding receiving point in the receiving airway receives the signal in sequence. After all the signals are received, the next transmitting point will start transmitting. After all launch points have completed their launches, the launch lanes and receiving lanes are swapped, and detection is carried out again. Only a few launch points were deployed in the cut-eye alley; The signal transmitted from the cut-eye tunnel is received within a range of 0-200m in the intake and return air tunnels.

[0008] Furthermore, the launch points of the intake airway and return airway are arranged at equal intervals, with a spacing of 50m.

[0009] Furthermore, the launch points of the cut-eye alley are arranged at equal intervals, with a spacing of 50m.

[0010] Furthermore, the receiving points are arranged at equal intervals, with a spacing of 10m.

[0011] Furthermore, among the transmitting points in the intake airway, the first transmitting point near the cut-eye airway has 6 receiving points in the return airway, and the remaining transmitting points have 11 receiving points in the return airway.

[0012] Furthermore, among the transmitting points in the return airway, the first transmitting point near the cut-eye airway has 6 receiving points in the intake airway, and the remaining transmitting points have 11 receiving points in the intake airway.

[0013] Furthermore, each transmitting point in the cut-eye alley has 21 receiving points in both the intake and return air alleys.

[0014] The beneficial effects of this invention are as follows: 1. The present invention, by adding a transmitting point in the cut-eye lane and setting up receiving points within 200m of the intake and return air lanes, can greatly reduce the "shadow area" in the detection results and greatly improve the accuracy of structural detection.

[0015] 2. Compared with the traditional pit-penetration layout method, the present invention does not require any additional equipment, and can greatly improve the detection accuracy simply by adding a launch point in the cut-eye lane. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the detection method for the pit penetration layout of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the detection method for the pit penetration layout of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of a conventional pit penetration layout; Figure 4 Schematic diagram of detection for conventional pit penetration deployment scheme Figure 1 ; Figure 5 Schematic diagram of detection for conventional pit penetration deployment scheme Figure 2 ; Wherein: 1-Intake airway; 2-Cut-eye airway; 3-Return airway; 4-Transmitting point; 5-Receiving point; 6-Structure; 7-Shadow area. Detailed Implementation

[0017] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0018] A method for improving the accuracy of initial structural detection of the pressure zone in a longwall mining face includes arranging launch and receiver points in the intake and return airways of the longwall mining face, and adding launch points in the cut-off roadway.

[0019] Both the intake and return airways are equipped with transmitters and receivers, with a transmitter spacing of 50m and a receiver spacing of 10m. Each transmitter in the intake airway has 11 receivers in the return airway (6 receivers in the first transmitter's corresponding airway), and each transmitter in the return airway has 11 receivers in the intake airway (6 receivers in the first transmitter's corresponding airway).

[0020] During detection, one tunnel serves as the transmitting tunnel, and the opposite tunnel as the receiving tunnel. During the signal transmission period at each transmitting point, the corresponding receiving point in the opposite tunnel receives the signal sequentially. After all signals have been received, the next transmitting point begins transmission. After all transmitting points have completed their transmissions, the transmitting and receiving tunnels are swapped, and detection is repeated. Only transmitting points are located in the cut-eye tunnel, with each transmitting point having 21 receiving points in both the intake and return air tunnels.

[0021] Figure 1 and Figure 2 These are schematic diagrams illustrating the detection method of the crater penetration layout of the present invention, wherein... Figure 1 The structure is located in the middle of the working face. Figure 2 The structure is located at the edge of the working surface; like Figure 1 and Figure 2 As shown, by adding a transmitting point in the cut-eye lane 2 and receiving signals within 200m of the cut-eye in the intake air lane 1 and return air lane 2, the area of ​​the shadow zone 7 around the structure 6 can be greatly reduced, and the positioning accuracy of the structure 6 can be greatly improved.

[0022] Figure 3 This is a schematic diagram of a conventional tunnel layout; the transmitting point 4 and the receiving point 5 are located in the intake airway 1 and return airway 3.

[0023] Figure 4 and Figure 5 These are schematic diagrams of conventional pit penetration testing schemes, in which... Figure 4 The structure is located in the middle of the working face. Figure 5 The structure is located at the edge of the working surface; like Figure 4 and Figure 5As shown, when structure 6 exists within the initial pressure range, the signal emitted by transmitting point 4 is absorbed and weakened as it passes through structure 6. Consequently, the signal received by receiving point 5 is also weakened, resulting in weak signal regions, i.e., shadow areas 7, on both sides of structure 6. These shadow areas represent the possible distribution areas of structure 6. As can be seen from the figure, the detected shadow area 7 is several times the actual size of structure 6. This method can accurately locate structure 6 laterally, but its accuracy is lower in the vertical direction.

Claims

1. A method for improving the accuracy of initial pressure zone structural detection in longwall mining faces, characterized in that: Includes the following steps: Several transmitting and receiving points are set up in both the intake and return air tunnels; During detection, the intake or return airway is used as the transmitting airway, and the corresponding return or intake airway is used as the receiving airway. During the signal transmission time of each transmitting point in the transmitting airway, the corresponding receiving point in the receiving airway receives the signal in sequence. After all the signals are received, the next transmitting point will start transmitting. After all launch points have completed their launches, the launch lanes and receiving lanes are swapped, and detection is carried out again. Only a few launch points were deployed in the cut-eye alley; The signal transmitted from the cut-eye tunnel is received within a range of 0-200m in the intake and return air tunnels.

2. The method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: The launch points of the intake and return airways are arranged at equal intervals, with a spacing of 50m.

3. The method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: The launch points of the cut-eye alley are arranged at equal intervals, with a spacing of 50m.

4. The method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: The receiving points are arranged at equal intervals, with a spacing of 10m.

5. The method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: Among the transmitting points in the intake airway, the first transmitting point near the cut-eye airway has 6 receiving points in the return airway, and the remaining transmitting points have 11 receiving points in the return airway.

6. The method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: Among the transmitting points in the return airway, the first transmitting point near the cut-eye airway has 6 receiving points in the intake airway, and the remaining transmitting points have 11 receiving points in the intake airway.

7. A method for improving the accuracy of initial pressure zone structural detection in a longwall mining face according to claim 1, characterized in that: Each transmitting point in the cut-eye alley has 21 receiving points in both the intake and return air alleys.

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