Study on the evolution law of failure depth of large mining height and ultra-wide working surface

Advancements in coal mining technology and sophisticated equipment have popularized large-scale mining with broad working faces. This study uses the 6306 ultra-wide working face of Jincheng Sihe Coal Mine as a case to establish a mechanical model of the bottom plate through theoretical analysis, field measurements, and numerical simulations. These methods address water outburst issues caused by high and wide working faces. The research systematically examines changes in the coal seam floor's displacement and stress fields during mining. A double-end water leak measurement device and peephole were employed to assess floor damage extent. Both quantitative and qualitative analyses were conducted to understand the…

• NN
  National Natural Science Foundation of China

  Awards: 52304084, 52174073, 52004082
• HU
  Henan University

  Award: 52004082