Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Table 2

Strength and cost comparisons between original set and new sets.

Pattern	The relative + cost/mass	The relative strength of the top arch	The relative strength of the bottom corners
Original set	1.0	1.0	1.0
Floor beam set	1.294	1.0	2.964
Roof beam set	1.274	2.345	1.0
RFB set	1.568	2.345	2.964
RFBB set	1.930	2.635	5.905