Study on Prediction Model of Mechanical Parameters of Rock Frozen-Thawed Damage based on NMR Technology

Table 3

Comparison of mechanical parameters between PLSR and PCR prediction models and mechanical experiments.

Mode l	Serial number	Elastic modulus (GPa)		Relative error (%)	Peak stress (MPa)		Relative error (%)	Peak strain (%)		Relative error
		P	M		P	M		P	M
PLSR	1	12.11	13.10	7.56	58.35	59.30	1.61	0.95	0.97	2.04%
	2	9.29	9.56	2.80	81.43	84.90	4.09	0.69	0.69	0.61%
	3	8.50	8.23	3.24	79.88	80.40	0.65	0.71	0.70	1.63%
PCR	1	12.01	13.10	8.31	58.34	59.30	1.61	0.95	0.97	2.04%
	2	8.89	9.56	7.04	81.43	84.90	4.09	0.69	0.69	0.61%
	3	8.57	8.23	4.16	79.88	80.40	0.65	0.71	0.70	1.63%

Note: P: predict; M: measure.