GB/T 25217.11-2019Methods for test, monitoring and prevention of rock burst—Part 11: Prevention method of destress blasting in coal seam (English PDF)
冲击地压测定、监测与防治方法 第11部分：煤层卸压爆破防治方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 30, 2019
Implementation date
March 1, 2020
Scope
GB/T 25217.11-2019 is the English-translated version of 冲击地压测定、监测与防治方法 第11部分：煤层卸压爆破防治方法.
GB/T 25217.11-2019 is Part 11 of GB/T 25217 and describes how pressure relief blasting in a coal seam is used to prevent rock burst.
It specifies the terms and definitions, the equipment, tools and materials, the blasting parameters and the safety requirements of the method, and applies to destress blasting carried out inside the coal seam to prevent rock burst.
It defines destress blasting in a coal seam, and separates loose blasting, done where the risk has been assessed, from relief blasting, done where monitoring and analysis have identified the hazard.
The equipment listed includes drilling rigs with bits and rods, non-metallic ties for the cartridges and charging rods of wood, bamboo or hard insulating material.
It cites GB 6722 and GB/T 16414. It was issued on 30 August 2019 and has applied since 1 March 2020.
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Document preview — GB/T 25217.11-2019
National Standard of the People's Republic of China
- ICS
- 73.040
- 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 Equipment, tools and materials
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 11th 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 tools involved in the method of preventing and controlling blasting of coal seams. With materials, blasting parameters and safety requirements.
This section applies to the blasting pressure relief in the coal seam to prevent impact ground pressure.
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 6722 blasting safety regulations
GB/T 16414 Coal Mine Science and Technology Terms Rock Mechanics
3 Terms and definitions
The following terms and definitions as defined in GB 6722 and GB/T 16414 apply to this document.
3.1 Coal seam pressure relief blasting destress blasting in coal seam
A method of preventing and controlling the impact of ground pressure to reduce the impact risk by blasting the dangerous area of the coal seam impact.
3.2 Loose blasting damaged blasting
Pressure relief blasting performed in areas where impact risk is assessed.
3.3 Explosion blasting relief blasting
Pressure relief blasting performed in the impact hazard area identified by monitoring and analysis.
4 Equipment, tools and materials
4.1 Drilling equipment
Drills and matching drill bits and drill pipes with corresponding construction capabilities.
4.2 Medicine roll fixation
Bundle the medicine roll with a non-metallic material.
4.3 Charger
Guns made of wood, bamboo or hard insulators.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 6722-2014 — Safety regulations for blasting
GB/T 16414-2008 — Terms relating to coal mining - Rock mechanics
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
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GB/T 25217.11-2019
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