The Effects of Backfill Mining on Strata Movement Rule and Water Inrush: A Case Study

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Abstract
Backfill mining is widely used to control strata movement and improve the stress environment in China’s coal mines. In the present study, the effects of backfill mining on strata movement and water inrush were studied based on a case study conducted in Caozhuang Coal Mine. The in-situ investigation measured abutment pressure distribution (APD), roof floor displacement (RFD), and vertical stress in the backfill area. Results are as follows: (i) The range and peak of APD, RFD, and vertical stress in the backfill area are smaller than in traditional longwall mining with the caving method. (ii) Backfill mining could change the movement form and amplitude of overburden and improve the ground pressure environment. (iii) Floor failure depth (FFD) is much smaller in backfill mining. Backfill mining can be an effective method for floor water inrush prevention.
Funding Information
  • National Natural Science Foundation of China (51804180)
  • The Key Research Plan of Shandong Province (2018GSF116007)
  • Natural Science Foundation of Shandong Province (ZR2017BEE033)
  • Postdoctoral Innovation Foundation of Shandong Province (201703076)
  • “Top Disciplines” Special Project of Mining and Safety Engineering College (1SY04602)

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