膏体充填综采工作面顶板变形规律及关键因素研究

doi:10.11799/ce202511001

Abstract

Abstract:

To investigate the effect of backfill on roof behavior and the influence of different factors on roof subsidence in paste backfilling mining, this study takes the fully mechanized paste backfilling face of the Weishen Coal Mine as a case study. Combining theoretical analysis, numerical simulation, and field measurements, the spatial interaction mechanism between the roof and backfill was examined. Key factors, including panel width (140~200m), mining height (1.5~3.0m), backfill strength (2.0~3.5MPa), and backfill ratio (80%~95%), were analyzed to determine their influence on roof subsidence. The range analysis method was employed to quantify factor weights, with practical adjustments applied. Theoretical results indicate that when the roof initially contacts the backfill, the roof span is 1.82m. As the face advances, the roof-backfill contact area increases, and the roof subsidence stabilizes at a maximum value of 0.333 m. Increasing panel width and mining height amplify maximum subsidence by 11.8% and 101.9%, respectively, whereas higher backfill strength and backfill ratio reduce it by 29.1% and 22.7%. Range analysis identified mining height as the dominant factor (weight: 49.7%), followed by backfill strength (22.8%), backfill ratio (16.2%), and panel width (11.3%).

Key words: paste filling mining, roof subsidence, numerical simulation, range analysis method, continuous curved beam

CLC Number:

TD327
TD823

References

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Roof deformation patterns and key influencing factors in fully mechanized mining faces with paste filling

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