Field Study on the Law of Surface Subsidence in the High-Intensity Fully Mechanized Caving Mining Working Face with Shallow Thick Bedrock and Thin Epipedon in Hilly Areas

Table 1

Boundary angles of observation lines on strike and inclination.

Observation line	Boundary angle on strike δ0		Rise boundary angle γ0		Dip boundary angle β0
	Measured value	Theoretical value	Measured value	Theoretical value	Measured value	Theoretical value
Observation line A on strike	50°	55°–60°	—	—	—	—
Observation line B on inclination	—	—	60°	55°–60°	50°	52°–57°
Observation line C on inclination	—	—	58°		50°