GB/T 42362-2023 in English

This standard systematically constructs a technical system for evaluating the degree of hazard of groundwater aquifer damage in mining areas, covering two mining methods: open-pit mining and underground mining, and establishes a quantitative evaluation model with 11 types of evaluation indicators and 4 levels of hazard classification.

Key Technology Framework

Key indicators of underground mining

• Vegetation degradation:Reduction in coverage, death rate of trees and shrubs, thickening of the vadose zone
• Soil desertification:Increase in sand content (>0.5mm particles), decrease in water content
• Risk of water inrush:Degree of fissure development (appearance → water conduction)

Typical application cases

Measured data from a coal mining area in Shanxi Province showed that the thickness of the vadose zone increased by 2.8m (Grade IV), and the density of surface fissures was 9/hm² (Grade IV). After weighted calculation, the W value reached 34.2, which was evaluated as a serious hazard level.

Data collection specifications

Regional difference processing

Based on the six geological environment zones in Appendix F, differentiated weight coefficients are adopted:

• North China:Focus on water resource depletion indicators (weight 2.2)
• Northwest China:Highlight surface flow interruption indicators (weight 2.2)

Compared with previous specifications, this standard has the following major breakthroughs:

1. For the first time, a quantitative evaluation system for changes in water storage structures is established
2. Remote sensing technology methods such as pixel binary model are introduced
3. The transformation of the degree of hazard from qualitative to quantitative evaluation is achieved

The implementation of the standard will effectively support the implementation of the series of standards of the "Green Mine Construction Specifications".