Fig 1.
(a) Filling support; (b) Roof-cutting support.
Fig 2.
(a) Technical process; (b) Operational procedure.
Table 1.
Statistics of gob-side roadway retention in Sichuan Coal Group.
Fig 3.
Layout of working face.
Fig 4.
Engineering geological conditions.
Table 2.
Chemical composition of gangue and stone.
Fig 5.
Structure and mechanical model of surrounding rock.
Fig 6.
The shape analysis of flexible formwork wall.
(a) Floor of vertical goaf; (b) Incline 20° to the goaf; (c) The floor of a vertical roadway.
Fig 7.
Design and practice.
Fig 8.
(a) Stone; (b) Gangue.
Fig 9.
SEM electron microscope scan of gangue.
Fig 10.
SEM electron microscope scan of stone.
Table 3.
Test results of physical properties of gangue and stone.
Table 4.
Experimental proportioning design.
Fig 11.
Analysis of test mix properties.
(a) Slump change curve; (b) Extension degree change curve.
Table 5.
Compressive strength test results.
Fig 12.
Analysis of concrete compressive strength tests.
(a) Cubic compressive strength; (b) Axial compressive strength.
Fig 13.
Results of compressive strength test.
Table 6.
Mix ratio of C30 flexible concrete.
Fig 14.
Comparative age-growth curves.
Fig 15.
Compressive strength comparison.
(a) Standard group; (b) Flexible formwork group.
Fig 16.
(a) Roadway deformation monitoring; (b) Wall stress monitoring.
Fig 17.
Engineering practice monitoring results.