Mechanical Analysis of the Failure Characteristics of Stope Floor Induced by Mining and Confined Aquifer

Table 1

Analysis of measured values and theoretical values of floor failure depth in five coal mines.

Coal mines	H (m)	M (m)	P (MPa)	Φ (°)	C (MPa)	Theoretical value (m)	Measured value (m)	Absolute error (%)	Relative error (%)
Xinzhi [41]	300	2.63	2.30	45	3.5	8.5	9.0	0.5	5.6
Yangcun [42]	273	1.20	3.47	50	2.5	9.4	10.1	0.7	7.0
Liujiazhuang [43]	300	3.08	1.78	42	4.5	15.8	16.9	1.1	6.5
Suntuan [44]	466	3.40	4.00	36	5.3	15.6	17.0	1.4	8.2
Chenghe [45]	300	1.80	2.20	45	3.8	9.5	10.0	0.5	5.0

Note. M represents the mining height.