Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

Table 2

Uniaxial compressive strength and its deterioration of coal samples.

pH	Types of coal samples	Number of cycles	Peak strength (MPa)	Cycle phase	Total deterioration (%)	Average deterioration of each stage (%)
7	Strong bursting liability	0	26.546	0	0.000	0.000
		1	24.341	1	8.309	8.309
		3	23.089	2	13.022	2.357
		6	22.222	3	16.288	1.089
		10	21.508	4	18.978	0.672
	No bursting liability	0	6.823	0	0.000	0.000
		1	6.115	1	10.381	10.381
		3	5.153	2	24.477	7.048
		6	4.688	3	31.298	2.274
		10	3.253	4	52.327	5.257
9	Strong bursting liability	1	23.756	1	10.512	10.512
		3	21.961	2	17.274	3.381
		6	20.607	3	22.372	1.699
		10	19.543	4	26.381	1.002
	No bursting liability	1	5.568	1	18.398	18.398
		3	4.144	2	39.271	10.437
		6	3.535	3	48.185	2.971
		10	2.890	4	57.647	2.365
4	Strong bursting liability	1	22.620	1	14.790	14.790
		3	20.774	2	21.744	3.477
		6	19.196	3	27.687	1.981
		10	17.547	4	33.899	1.553
	No bursting liability	1	4.616	1	32.345	32.345
		3	3.274	2	52.016	9.836
		6	2.101	3	69.202	5.729
		10	1.718	4	74.821	1.405