Seam with Outburst in Potential
embankment with steep slope
Inclined shaft with steep slope
rock stratum with steep dip angle
top coal caving in steep seam face
tunnel with steep slope
coal seam with greater inclination angle
coal seam with high gas content and low permeabili
coal seam with high inclined angle
deep inclined seam with potential outburst
low protected seam with ultra distance
seam with complex geological conditions
seam with shallow mining depth
shallow coal seam with thin bedrock
top coal seam with parting band