Optimal Proportion of Similar Materials and Rockburst Tendency of White Sandstone

Table 7

Analysis of the difference in elastic modulus of each factor covered by the study.

Factor level	(A) Quartz sand (%)	(B) Iron powder (%)	(C) Plaster : cement	(D) Sand size (mm)
I1	2.07	2.02	2.05	2.53
I2	1.95	1.90	1.82	2.50
I3	1.82	1.74	1.81	2.45
I4	1.85	2.02	2.01	2.20
Range	0.25	0.29	0.24	0.33