Application of Microtremor Survey Technology in a Coal Mine Goaf
Jun 06,2025
This paper, titled "Application of Microtremor Survey Technology in a Coal Mine Goaf," explores the use of microtremor survey technology for detecting goafs (abandoned mining areas) in coal mines. The study was conducted in the Nanling Coal Mine in Taiyuan, China, using a linear array and rolling acquisition method to collect microtremor data. The extended spatial autocorrelation method (ESPAC) was employed to extract dispersion curves, which were then inverted to obtain the apparent shear wave velocity profiles. The results showed clear low-velocity anomalies corresponding to the goaf areas, demonstrating the effectiveness of microtremor exploration in detecting underground voids.
The GN309 remote real-time intelligent microtremor detector was used in this study. Its key applications and advantages include:
1. High Sensitivity and Wide Frequency Response:
- Natural Frequency: 2 Hz
- Sensitivity: 260 V/m/s
- Frequency Response Range: 0.1–1600Hz
- These characteristics make the GN309 suitable for detecting low-amplitude microtremors across a wide frequency range, essential for accurate dispersion curve extraction.
2. Real-Time Data Transmission
- The GN309 supports real-time data transmission via a 4G signal, allowing for immediate data processing and analysis. This feature is crucial for efficient field operations and quick decision-making.
3. Consistency and Reliability
- Before data collection, a consistency test was conducted to ensure that all instruments recorded data with similar response trends and waveform consistency. This ensures reliable and accurate data collection.
4. Ease of Use and Deployment
- The GN309 is designed for easy setup and deployment in various field conditions. Its compact size and robust construction make it suitable for use in challenging environments, such as those found in mining areas.
5. High Data Quality
- The GN309's high sensitivity and low noise characteristics ensure high-quality seismic data, which is critical for precise microtremor analysis and dispersion curve extraction.
6. Versatility
- The GN309 can be used in various geophysical exploration scenarios, including microtremor surveys, seismic monitoring, and environmental geophysics. Its versatility makes it a valuable tool for both research and practical applications.
In summary, the GN309 seismograph's high sensitivity, wide frequency response, real-time data transmission, and ease of use make it an ideal instrument for microtremor survey technology, particularly in detecting goafs and other underground anomalies.
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