Calculation of Subsidence due to Longwall Mining with Overburden Grouting and Its Application

Table 1

Classification of critical deformation values of surface concrete structures [37].

Damage level	Surface movements and deformations			Classification	Structural processing
	Horizontal strain; (mm•m^-1)	Slope; (mm•m^-1)	Curvature; (mm•m^-2)
I	≤2.0	≤3.0	≤0.2	Negligible damage	No repair
II	≤4.0	≤6.0	≤0.4	Slight damage	Light repair
III	≤6.0	≤10.0	≤0.6	Medium damage	Medium repair
IV	>6.0	>10.0	>0.6	Severe damage	Heavy repair or reconstruction