Determination of Cyclic Filling Length in Gob-Side Entry Retained with Roadside Filling and Its Application

Table 1

Maximum tensile stress of the lower immediate roof in GER-RF with respect to the length of the lagging unsupported roof and cyclic filling length.

Length of the lagging unsupported roof (m)	Cyclic filling length (m)	Maximum tensile stress (MPa)
2.0	1.2	−0.095 (in this case, compressive stress)
2.5	1.7	0.12
3.0	2.2	0.32
3.5	2.7	0.52
4.0	3.2	0.72
4.5	3.7	0.9
5.0	4.2	1.08