Optimal Proportion of Similar Materials and Rockburst Tendency of White Sandstone

Table 6

Analysis of the extreme difference in tensile strength of various factors covered by the study.

Factor level	(A) Quartz sand (%)	(B) Iron powder (%)	(C) Plaster : cement	(D) Sand size (mm)
I1	2.51	2.51	2.42	2.53
I2	2.50	2.60	2.47	2.50
I3	2.36	2.42	2.47	2.45
I4	2.31	2.15	2.31	2.20
Range	0.21	0.45	0.16	0.33