Permanent Deformation Characteristics of Coarse Grained Subgrade Soils under Train-Induced Repeated Load

Table 1

Summary of test loading program.

Test series	Specimen number	Consolidation stress ratio (—)	Confining pressure (MPa)	Cyclic stress (MPa)
Series 1	PD-01-PD-06	2.0	0.3	0.3, 0.4, 0.5, 0.6, 0.7, 0.8
Series 2	PD-07-PD-11	2.0	0.5	0.5, 0.65, 0.8, 0.95, 1.1
Series 3	PD-12-PD-15	2.0	0.1, 0.3, 0.5, 0.7	0.5
Series 4	PD-16	2.0	0.1	0.1
	PD-17		0.3	0.3
	PD-18		0.5	0.5
	PD-19		0.7	0.7
Series 5	PD-20	1.0	0.3	0.3
	PD-21	1.6	0.25
	PD-22	2.0	0.22
	PD-23	2.5	0.2
Series 6	PD-24	1.0	0.3	0.8
	PD-25	1.6		0.62
	PD-26	2.0		0.5
	PD-27	2.5		0.35