GB/T 25217.4-2019Methods for test, monitoring and prevention of rock burst—Part 4: Monitoring method of microseismicity (English PDF)
冲击地压测定、监测与防治方法 第4部分:微震监测方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 18, 2019
Implementation date
May 1, 2020
Scope
GB/T 25217.4-2019 is the English-translated version of 冲击地压测定、监测与防治方法 第4部分:微震监测方法.
GB/T 25217.4-2019 is Part 4 of GB/T 25217, the Chinese series on testing, monitoring and preventing rock burst in coal mines, and it covers the micro-seismic monitoring method.
It sets out the terms used, the instruments and technical parameters required, the layout of the micro-seismic monitoring system and the way a rock burst hazard is identified from its readings.
Micro-seismicity is taken as coal or rock fracture around a roadway or working face with vibration energy above 100 J and a frequency of 0.1 Hz to 150 Hz, and the standard also defines the monitoring system, its sensors, and micro-seismic energy, total energy and frequency.
Equipment has to run 24 hours without interruption, with a backup supply that keeps the system working when mine power fails. It was issued on 18 October 2019 and has applied since 1 May 2020.
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Document preview — GB/T 25217.4-2019
National Standard of the People's Republic of China
- ICS
- 73.010
- Classification
- D 20
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Terms and definitions
- 3 Instruments and technical parameters
Foreword
GB/T 25217 "Method for measuring, monitoring and controlling impact ground pressure" is divided into 14 parts.
--- Part 1. Determination of impact tendency classification and index of roof rock formation;
--- Part 2. Determination of the impact tendency of coal and the method of determining the index;
--- Part 3. Determination of the impact tendency classification and index of coal and rock composite test pieces;
--- Part 4. Microseismic monitoring methods;
--- Part 5. Geophone monitoring methods;
---Part 6. Drill cuttings monitoring method;
---Part 7. Mining stress monitoring method;
--- Part 8. Electromagnetic radiation monitoring methods;
---Part 9. Coal seam water injection prevention methods;
--- Part 10. Coal seam drilling pressure relief method;
--- Part 11. Coal seam pressure relief blasting prevention methods;
--- Part 12. Prevention and control methods for mining protective layers;
--- Part 13. Prevention and treatment of roof deep hole blasting;
--- Part 14. Roof hydraulic pressure cracking prevention methods.
This part is the fourth part of GB/T 25217.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This part of GB/T 25217 specifies the terms and definitions, equipment and technology involved in the monitoring method of mine ground pressure microseism Parameters, microseismic monitoring system layout scheme, impact ground pressure hazard identification method.
This section applies to coal mine impact ground pressure microseismic monitoring.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1 Microseismicity
Coal (rock) body rupture phenomenon with vibration energy greater than 100J and frequency of 0.1Hz~150Hz around the roadway or working face.
2.2 Microseismic monitoring system
System for monitoring, recording, and analyzing microseisms, consisting of microseismic sensors, signal acquisition systems, data transmission systems, time synchronization systems, and numbers According to the analysis system and other components.
2.3 Microseismic sensor
A sensor that monitors the microseismic signal and converts the microseismic signal into an electrical signal.
Note: Rewrite GB/T 7665-2005, definition 3.1.1.
2.4 Microseismic energy
The elastic wave energy of the microseismic source radiation.
2.5 Microseismic total energy
The sum of the energy of the microseismic events per unit time.
2.6 Microseismic frequency
The number of microseismic events occurring in a unit of time.
3 Instruments and technical parameters
3.1 Basic requirements for the use of equipment
Equipment and equipment should meet the following requirements.
a) The configuration and technical parameters of the shock and pressure microseismic monitoring equipment shall meet the requirements of 4.2~4.4.
b) The microseismic monitoring system shall ensure 24 hours of uninterrupted operation. When the mine power grid is out of power, the backup power supply shall keep the system working normally.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 25217.1-2010 — Methods for test, monitoring and prevention of rock burst - Part 1: Classification and laboratory test method on bursting liability of roof strata
GB/T 25217.10-2019 — Methods for test, monitoring and prevention of rock burst—Part 10: Prevention method of drillhole destressing on coal-seam
GB/T 25217.11-2019 — Methods for test, monitoring and prevention of rock burst—Part 11: Prevention method of destress blasting in coal seam
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