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

Table 1

The porosity of crushed coal with different grain sizes.

Grain size (mm)	Density	First measurement		Second measurement		Third measurement		Porosity
		Volume (cm^3)	Quality (g)	Volume (cm^3)	Quality (g)	Volume (cm^3)	Quality (g)
4.75–9.50	1.276	4000	2591	4000	2753	4000	2663	0.477
9.50–16.0	1.276	4000	2583	4000	2675	4000	2521	0.492
16.0–19.0	1.276	4000	2517	4000	2616	4000	2583	0.496
19.0–26.5	1.276	4000	2512	4000	2554	4000	2620	0.498
26.5–31.5	1.276	4000	2443	4000	2536	4000	2494	0.512
31.5–37.5	1.276	4000	2435	4000	2312	4000	2372	0.535