YHSPT-8 intrinsically safe geological advance detector for mining

NegotiableUpdate on 05/31

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Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

Coal mine tunnels are the throat of safety production, with characteristics such as long length, multiple construction sites, and frequent safety accidents. During the process of tunnel excavation, adverse geological bodies in front of the tunnel that may cause safety accidents, such as collapse columns, water rich zones, gas rich areas, etc. Tunnel accidents have become one of the main threats to coal mine safety production, seriously endangering the safety production of coal mines. Therefore, identifying the geological and fluid distribution anomalies ahead of the excavation site in advance can enable reasonable planning and targeted management, effectively reducing or even avoiding the occurrence of dynamic disasters.

Product Details

1. Product Introduction

The hardware of the advanced detection system for coal mine tunnels mainly includes a data intelligent acquisition tablet, an acquisition host, high-precision seismic detectors, and connecting cables.

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2. Product principle

The advanced detection technology for coal mine tunnels during excavation uses HSP, which stands for Horizontal Sonic/Seismic Profiling. This technology follows the Huygens Fresnel principle and Fermat principle, with the prerequisite that there is a difference in wave impedance (density * longitudinal wave velocity) in the medium. The significant difference in wave impedance between geological bodies such as karst caves (cavities), weak interlayers, fractured strata, faults, joint dense zones, and water rich structural zones and the background strata provides a theoretical basis for prediction, as shown in Figure (a). The HSP method, suitable for TBM or tunneling machine construction of coal mine tunnels, uses the vibration signal generated by the rock breaking of the cutterhead roller cutter as the detection source to spatially image the unfavorable geological body ahead and achieve prediction and forecasting. The propagation speed and particle vibration amplitude of the wave field are closely related to the composition, density, structural characteristics, and other factors of the medium. Using a spatial array testing arrangement method, while receiving the vibration echoes of the surrounding rock, the vibration noise of the shield machine body is synchronously connected. In the fully excavated state of the shield machine, after continuously receiving a sufficient amount of vibration signal data (usually continuous data reception for no less than 9 minutes), Figure (b) is a schematic diagram of the testing arrangement.

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1. Fault, collapse column, erosion zone, goaf, distribution of gangue layer, coal seam thickness, coal seam ground pressure detection

2. Safety thickness testing for structures containing water and gas.

3. Changes in coal depth and thickness in the lower group.

4. Detection of hidden structures and discontinuous geological bodies in coal seams within the working face.

5. Igneous rock intrusion detection

6. The detection of water and investigation of hidden disaster causing factors in goaf with roof collapse or water enrichment provide strong technical support.

This is suitable for coal mine excavation tunnels. HSP method is a type of elastic wave detection method that uses the vibration signal generated by the cutting cutter of the excavation machine to shear the coal seam and rock (soil) as the excitation source. Its characteristics are manifested in:

1. On site testing is convenient and does not require explosion or hammering. The convenience of testing using the coal breaking and rock vibration of the cutterhead and rolling cutter of the tunneling machine as the excitation source is far superior to the active source seismic wave prediction method;

2. The deployment of detection points has strong adaptability and can be arranged at any position along the contour of coal mine tunnels. Adopting a full space array layout, the detection points can be placed at any position on the contour of the coal mine roadway within the range of 0-30 meters behind the shield tail, ensuring that the distance between the detection points is greater than 1.5 meters, and recording the coordinate positions is sufficient;

3. No need to stop the tunneling machine, it does not affect construction. Using excavation rock breaking vibration as the seismic source, detection is carried out during the excavation process of the tunneling machine without stopping the machine;

4. No pre test preparation work, short on-site testing time. This method takes about 10 minutes to set up detectors on site, and the testing time is 10-15 minutes, which is short;

5. The detection object meets the requirements of long-distance seismic wave detection. The HSP method uses seismic wave reflection to detect adverse geological bodies in front of the tunnel that may cause safety accidents, such as collapse columns, water rich zones, gas rich areas, etc. The effective detection distance is not less than 100m.

A mine in Pingdingshan uses a comprehensive excavator for excavation operations, and the on-site detection device of the coal seam roadway advanced detection system is arranged as shown in Figure 1. A TEM-HSP coal mine roadway ahead detection system is installed behind the coal seam working face excavation roadway, with 8 external seismic detectors numbered S1-S8, spaced 3m apart, installed on the coal seam wall of the roadway working face. Due to the poor safety within 10 meters behind the roadway during excavation and the large amount of coal ash within 10-20 meters. Therefore, the first seismic detector S1 behind the head is arranged within a range of 10-20m behind the head according to the on-site environment. For every 20m advance of the head, the last seismic detector S8 moves forward 48m, 10-20m away from the latest roadway head. The entire detection device alternates forward as the roadway moves forward. The installation depth of the seismic detector is 3m, and the depression angle hole is 3 °, as shown in Figure 2.

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