Mechanical Properties of Grouted Crushed Coal with Different Grain Size Mixtures under Triaxial Compression

Figure 3

(a) Self-developed grouting experimental apparatus, (b) inner cylindrical grouting barrel used for the placement of the crushed coal sample, and (c) part of the schematic layout of this grouting experimental equipment: 1: controllable grouting pump; 2: pressure gauge; 3: external grouting pipe; 4: bottom plate; 5: grouting hole on the bottom plate; 6: outer grouting barrel; 7: inner grouting barrel; 8: grouting steel tube; 9: small grouting holes on the surface of the grouting steel tube; 10: test specimen; 11: fine holes attached to the sidewall of the inner barrel; 12: bottom valve; 13: outlet; 14: seal rings; 15: sealing plug; 16: channel between the inner and outer barrels; 17: safety valve on the outlet; 18: load-bearing plate.

(a)

(b)

(c)