Research on Inpit Dumping Height during Tracing Mining Period between Two Adjacent Surface Coal Mines

Table 1

Basic parameters of the inpit dumping height model.

Serial number	Mining parameters	Symbol	Unit	Parameter values
1	Mining depth	H	m	180
2	Bottom working bench length	L	m	2000
3	Northern end-slope angle	α	°	32
4	Stability slope angle of inner dump	β	°	20
5	Working slope angle	γ	°	10
6	Working slope angle of inner dump	φ	°	17
7	Distance between the working bench and the bottom dumping bench	Lz	m	60
8	Transportation road gradient	i	%	8
9	Annual advancement in haerwusu surface coal mine		m	400
10	Annual advancement in haidaigou surface coal mine	v′	m	350
11	Transportation cost of inpit dumping	Cy	Yuan/m^4	0.0025
12	Secondary stripping cost	CB	Yuan/m^3	12