Comparative Analyses Concerning Triaxial Compressive Yield Criteria of Coal with the Presence of Pore Water

Table 1

Test results of ultimate strength of coal samples.

DT^1 natural coal		DT water-saturated nonseeping coal		DT seepage coal		BD^2 natural coal [33]		XH^3 natural coal [34]		BD seepage coal [34]		YC^4 natural coal [32]
(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)	(MPa)
0	16.078	0	11.094	5	41.267	0	30.16	0	21.07	4	33.78	0	16.5
0	15.68	0	12.181	7	55.242	2	44.38	2	39.13	6	40.21	0	18.13
5	51.659	5	47.617	8	59.113	5	63.04	5	59.04	8	52.24	0	17.87
5	48.682	5	43.675	12	69.864	8	76.89	8	67.99	XH seepage coal [34]		0	18.22
15	82.552	15	69.619	—	—	12	92.51	11	76.77	(MPa)	(MPa)	5	47.74
15	81.811	15	65.818	—	—	16	106.07	14	89.91	4	24.32	10	59.13
25	104.548	25	101.212	—	—	20	112.99	17	103.77	6	29.77	20	76.62
25	106.615	25	95.659	—	—	24	123.16	20	113.32	8	33.89	25	97.24

¹DT denotes Dongtan coal mine. ²BD denotes Baodian coal mine. ³XH denotes Xinhe coal mine. ⁴C denotes Yangcun coal mine.