Comprehensive Analysis on Surface Movement Angle Parameters in Xuzhou Mining Area

In order to reasonably design the protection coal pillar when mining under buildings in Xuzhou Mining Area, waterbodies and railways, this paper system atially studied and synthetically analyzed data of more than ten mining subsidence observation stations, and revealed the relationship between ground movement ang . e parameters and geological and mining conditions. The results showed that downhill boundary angle and downhill angle of draw had close relationship with angle of mi ne seam; uphill boundary angle and uphill angle of draw had close relationship with the thickness of the base rock; the fore effect angle was directly proportional to the thickness of the base rock, and inversely proportional to mining thickness and mining face forward speed; maximum subsidence speed lag angle was directly proportion al to the ratio of alluvium thickness to mining depth, mining face forward speed and inversely proportional to the mining thickness. The series of formula established in t he paper are correct, reliable and simple, and have wide application prospect in Xuzhou coal mining area.