Experimental Study on the Influence of Aging on Mechanical Properties of Geogrids and Bearing Capacity of Reinforced Sand Cushion

Table 4

The results of gray model prediction.

Aging time (h)		0	100	200	300	400	500	600
BG1 tensile strength retention rate	Test value (%)	100	98.6	94.4	88.8	79.80	73.7	69.7
	Predicted value (%)	100	100.1	93.1	86.6	80.5	74.8	69.5
	Relative error (%)	—	1.52	1.38	2.48	0.88	1.49	0.29
BG2 tensile strength retention rate	Test value (%)	100	97.8	96.4	90.8	86.5	85.3	80.1
	Predicted value (%)	100	98.70	94.81	91.08	87.49	84.04	80.73
	Relative error (%)	—	0.92	1.65	0.30	1.14	1.48	0.78