Rock Load Estimation in Development Galleries and Junctions for Underground Coal Mines: A CMRI-ISM Rock Mass Rating Approach

Table 5

Regression equations between CMRI-ISM RMR and rock load of galleries and Junctions.

Case number	Parameters	Regression equations	𝑅^2 value
1	RMR versus rock load; (for 3.6 m wide galleries)	R/L(galleries)=7.2−0.09∗RMR	0.94
2	RMR versus rock load; (for 4.2 m wide galleries)	R/L(galleries)=5.9−0.06∗RMR	0.98
3	RMR versus rock load; (for 4.8 m wide galleries)	R/L(galleries)=6.4−0.07∗RMR	0.86
4	RMR versus rock load; (for 3.6 m wide junctions)	R/L(junctions)=9.2−0.10∗RMR	0.94
5	RMR versus rock load; (for 4.2 m wide junctions)	R/L(junctions)=6.3−0.06∗RMR	0.96
6	RMR versus rock load; (for 4.8 m wide junctions)	R/L(junctions)=6.1−0.05∗RMR	0.72