Experimental Investigation of the Influence for Stoping Sequence and Granular Grading on Lateral Pressure during the Nonpillar Sublevel Caving Mining

Table 1

The conventional computational formulas of the lateral pressure.

The conventional laws		Proposer
;		Janssen [13]
; ;		Reimbert [14]
; ; ;		Coulomb [15]
;		Wilfred Airy [16]
;		Chen [17]
, ; ,		Rankine [18]

Note: p was the lateral pressure; p_a was the active lateral pressure; p_b was the passive lateral pressure; K was the coefficient of the lateral pressure; K_a was the coefficient of the active lateral pressure; K_b was the coefficient of the passive lateral pressure; γ was the unit weight of granular media; S was the horizontal projected area of the class silo; C was the perimeter of horizontal projection for the class silo; f was friction coefficient between granular media and class silo, f = tan ϕ, ϕ was the friction angle between granular media and class silo; z was the height of granular media; ε was the angle between class silo and vertical line; θ was the internal friction angle of granular media; α was the dip of the class silo; β was the dip of the soil surface; D was the inner diameter of the class silo; ζ was the angle of rupture; μ was the angle of repose for granular media.