Mechanism and Integrated Control of “Rib Spalling: Roof Collapse—Support Instability” Hazard Chains in Steeply Dipping Soft Coal Seams

Table 1

Programs and parameters of the flexible support technique [40].

Program	Bore diameter, cm	Hole depth, m	Angle, °	Spacing, m	Distance from the floor, m	Coir rope diameter, cm
Normal region	42	8	40	4	2.6	25
Tectonic region	28	6	502	2	1.8	15
Complex region	76	30	3-4	4	2	30