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GB/T 25217.5-2019Methods for test, monitoring and prevention of rock burst—Part 5: Monitoring method of earth-sound (English PDF)

冲击地压测定、监测与防治方法 第5部分:地音监测方法

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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 25217.5-2019 is the English-translated version of 冲击地压测定、监测与防治方法 第5部分:地音监测方法.

GB/T 25217.5-2019 is the Chinese national method for watching rock-burst hazard in coal mines through earth-sound, the micro-vibration released as coal and rock are loaded.

It is Part 5 of GB/T 25217, a series of fourteen parts on the measurement, monitoring and prevention of rock burst; it fixes the terms used in earth-sound monitoring - the event itself, its frequency and its energy, the geophone sensor, the signal amplifier and the ground central station - then the monitoring equipment and its main technical parameters, the installation requirements, the processing of the data and the methods for assessing the hazard.

It applies to rock-burst and earth-sound monitoring in coal mines, and cites GB 3836 and GB/T 4208 for the explosion protection and enclosure rating of the instruments. It was issued on 18 October 2019 and has applied since 1 May 2020.

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Document preview — GB/T 25217.5-2019

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 Normative references
  • 3 Terms and definitions
  • 4 Geophone monitoring equipment, technical parameters and solutions

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. Prevention and treatment of roof-oriented hydraulic fracturing.

This part is the fifth 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 involved in the impact hazard geophone monitoring method, geophone monitoring equipment, and installation requirements, data processing and risk assessment methods.

This section is applicable to the monitoring of ground pressure and geophone in coal mines.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document.

For undated references, the latest edition (including all amendments) applies to this document.

GB 3836 (all parts) Explosion-proof electrical equipment for explosive atmospheres

GB/T 4208 enclosure protection grade (IP code)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Earth-sound

The micro-vibration information generated during the loading process of coal and rock mass is generally less than 100J and the frequency is greater than 150Hz.

3.2 Frequency of earth-sound

The number of geophone events generated by coal and rock mass per unit time within a certain spatial range.

3.3 Earth-sound energy

The energy release value of a geophone event generated per unit time within a certain spatial range.

3.4 Earth-sound sensor

A device for receiving a downhole ground signal.

3.5 Signal amplifier

A device for receiving a ground signal received by a geophone, and then transmitting the signal to a ground center station.

3.6 Ground center station

A device for receiving a ground signal transmitted by a downhole signal amplifier and performing data storage and processing.

4 Geophone monitoring equipment, technical parameters and solutions

4.1 Geophone monitoring equipment and main technical parameters

The ground sound monitor should comply with the relevant provisions of GB 3836 and GB/T 4208.

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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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