Experimental Study on Flow Characteristics of Aeolian Sand in Fractures

Table 2

Effect of fracture angle on the rate of collapse under different fracture size.

Crack opening l (mm)	Fitting equation of the velocity of sand inrush and the opening degree of fracture	Related coefficients
2	= -4.46–3.86ln (α-35.6)	R^2 = 0.99515
3	= 6.06–2.67 ln (α-41.8)	R^2 = 0.93608
4	= 7.925.26 ln (α-41.13)	R^2 = 0.98309
5	= −13.69–14.61 ln (α-35.9)	R^2 = 0.92270
6	= −48.28–27.1 ln (α-29.71)	R^2 = 0.89861