GB/T 39336-2020 in English
VALIDTechnical requirement of roadside bag filling for gob-side entry retaining with high-water material
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | GB/T 39336-2020 |
| Document status: | VALID |
| Title in English: | Technical requirement of roadside bag filling for gob-side entry retaining with high-water material |
| Title in Chinese: | 沿空留巷巷旁袋式充填技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| ICS Classification: | 73.020-Mining and quarrying |
| Chinese Classification: | D15-Mining |
| Professional Classification: | GB-National Standard |
| Related Topics: | Frontier Material Testing
Frontier Coil Requirements water material Material cutting-edge technology Frontiers of Polymer Materials Alley Frontier New Materials Frontiers of Polymer Materials Frontier Material Layout Frontiers of Optoelectronic Materials Frontier Waterproof Material Thickness filling Frontier New Materials State-of-the-art technologies in materials chemistry Cutting edge technology of material testing GBT39336 GB/T 39336-2020 High water material |
《GB/T 39336-2020沿空留巷高水材料巷旁袋式充填技术要求》由603（中国煤炭工业协会）归口，主管部门为中国煤炭工业协会。
Introduction
Technical background and evolution of the standard
With the increase in the depth of coal mining in my country, traditional tunneling technology faces problems such as severe mine pressure and high support costs. This standard systematically regulates the application of high-water materials (water volume ratio ≤90%) in tunneling projects along the goaf for the first time. Compared with traditional gangue filling, it has the characteristics of fast setting speed (4h strength reaches 1.2-4MPa) and good roof connection performance.
Core Technology Innovation
| Technical Dimension | Traditional Technology | This Standard Solution | Improved Benefits |
|---|---|---|---|
| Material System | Single-Component Cement Slurry | Two-Component (Material A/Material B) | Controllable Setting Time (10-30s) |
| Transportation Method | Single-Line Pumping | Dual-Line + Y-Type Mixer | Mixing Uniformity Improved by 40% |
| Support structure | Rigid wall | Bag filling + tension anchor | Lateral bearing capacity increased by 2-3 times |
Key process parameter control
Pulping system configuration requirements
The standard stipulates that the pulping system must include: automatic metering system, double mixing barrel group (1 each for prefabricated/finished product), and plunger grouting pump (JB/T 7043 compliant). The typical configuration is shown in Figure 1, where:
- Water temperature control range: 18-30℃
- Slurry flow rate lower limit: 2m/s
- Mixed slurry pipe diameter ratio: 1.1-1.3 times single slurry pipe
Solutions to implementation difficulties
Anti-slip measures for large-angle tunnels
For coal seam inclination ＞15°, the standard innovatively proposes the anti-slip anchor bolt design (see Figure 5):
- The anchor end penetrates the bottom rock layer ≥1.2m
- The rod body and the filling body are bonded with epoxy resin
- The preload force is not less than 50kN
Quality control system
Establish a three-level detection mechanism:
| Testing stage | Testing items | Qualified standards | Method basis |
|---|---|---|---|
| Material delivery | Fineness | ≤45μm sieve residue＜15% | GB/T 39337 |
| Construction process | Filling density | Vent hole overflow rate 100% | Visual inspection |
| Finished product acceptance | 28d strength | ≥design value 120% | Core sampling |
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