Safety research on dumping rocks along the collapse pit of Gong-chang-ling iron mine

Granular media in the bottom of collapse pit moved with ore body, according to the research of stochastic medium theory of ore drawing (Ren 1994), the relationship between maximum velocity vz and height level of granular media change h is:

v q hz

≈

πβ α (1)

where, α, β = granular flow parameters, h = level; q = The volume of discharged of granula media in unit time in lower mining stope.