Laboratory Model Tests on Flow Erosion Failure Mechanism of a Slope Consisting of Anqing Group Clay Gravel Layer

Table 2

Analysis of influencing factors of runoff rate in stable stage.

Test number	Gravel content (%)	Slope ratio	Rainfall intensity (mm/h)	The stable runoff rate (mm/h)
A	30	1 : 0.5	180	140.2
B	50	1 : 0.5	100	62.6
C	70	1 : 0.5	140	97.9
D	30	1 : 1.5	100	76.6
E	50	1 : 1.5	140	112.5
F	70	1 : 1.5	180	148.8
G	30	1 : 2.5	140	106.1
H	50	1 : 2.5	180	144.6
I	70	1 : 2.5	100	68.6
T1	322.9	300.7	207.8
T2	319.7	337.9	316.5
T3	315.3	319.3	433.6
m1	107.63	100.23	69.27
m2	106.57	112.63	105.5
m3	105.1	106.43	144.53
	2.53	12.40	75.27

Note that the “T1” line gives the sum of the average rates of the three tests in the stable phase under the condition of 30% gravel content; , and the ; it is listed in “m1.” Similarly, the average runoff rates of the three tests under 50% and 70% gravel content were 106.57 and 105.1, respectively. The ranges of the three average values were , which is listed in the last row of the table. Corresponding numbers for the slope ratio and rainfall intensity were calculated similarly.