Research on Subgrade Differential Settlement Control Standard and Treatment Technology Based on Driving Comfort

Table 9

Differential settlement control standards based on driving comfort.

Vehicle speed (km/h)	Different comfort level differential settlement control standards (cm)
	Differential settlement length 10 m				Differential settlement length 20 m
	Excellent	Good	Poor	Worse	Excellent	Good	Poor	Worse
120	S < 1.6	1.6 ≤ S < 2.4	2.4 ≤ S < 4.2	S ≥ 4.2	S < 3.3	3.3 ≤ S < 5.2	5.2 ≤ S < 7.3	S ≥ 7.3
100	S < 2.2	2.2 ≤ S < 3.1	3.1 ≤ S < 4.9	S ≥ 4.9	S < 4.2	4.2 ≤ S < 5.9	5.9 ≤ S < 8.2	S ≥ 8.2
80	S < 2.4	2.4 ≤ S < 3.6	3.6 ≤ S < 5.3	S ≥ 5.3	S < 5.2	5.2 ≤ S < 6.8	6.8 ≤ S < 8.8	S ≥ 8.8
60	S < 3.0	3.0 ≤ S < 4.1	4.1 ≤ S < 5.8	S ≥ 5.8	S < 5.9	5.9 ≤ S < 7.6	7.6 ≤ S < 9.3	S ≥ 9.3
40	S < 3.5	3.5 ≤ S < 4.8	4.8 ≤ S < 6.3	S ≥ 6.3	S < 6.2	6.2 ≤ S < 7.9	7.9 ≤ S < 9.6	S ≥ 9.6