Study on Filling Material Ratio and Filling Effect: Taking Coarse Fly Ash and Coal Gangue as the Main Filling Component

Table 1

Proportioning principle of paste filling material.

Collapse degree	Stratification degree	8 h strength	28 d strength	Initial setting time	Final setting time	Bleeding rate	Ratio of coal gangue <5 mm
>18 cm	<2 cm	>0.1 MPa	>3 MPa	>4 h	<8 h	<3%	35%∼45%