Research Article

A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine

Table 1

Empirical formula and calculation result [1719].

FormulaEquationCommon value of empirical parameters (m/s)Q (m3/h)

Chezy formula0.010–0.0305.44–16.321537–4611
Hazen–William formula100–14015.40–21.564352–6093
Scobey formula0.3–0.60.48–0.70137–1977
Actual result4400–5400