Table 1 Compaction standards for fillers...

Table 1

Compaction standards for fillers of surface layer and bottom layer of subgrade bed

Position	Filler	Compaction standard
Position	Filler	Compaction coefficient, K	Subsoil coefficient, K₃₀/(MPa·m^-1)	7 d unconfined compressive strength of saturated soil/kPa	Dynamic deformation modulus, E_vd/MPa
Surface layer	Graded crushed stone	≥0.97	≥190		≥55
Bottom layer	Group A and Group B coarse gravel soil and crushed stone	≥0.95	≥150		≥40
	Group A and B sandy soil (except silty sand) and fine gravel soil	≥0.95	≥130		≥40
	Chemically modified soil	≥0.95		≥350 (550)

Position	Filler	Compaction standard
Position	Filler	Compaction coefficient, K	Subsoil coefficient, K₃₀/(MPa·m^-1)	7 d unconfined compressive strength of saturated soil/kPa	Dynamic deformation modulus, E_vd/MPa
Surface layer	Graded crushed stone	≥0.97	≥190		≥55
Bottom layer	Group A and Group B coarse gravel soil and crushed stone	≥0.95	≥150		≥40
	Group A and B sandy soil (except silty sand) and fine gravel soil	≥0.95	≥130		≥40
	Chemically modified soil	≥0.95		≥350 (550)

Note(s): The bracketed value is the strength required for chemically improved soil considering the freeze-thaw cycle in severe cold areas. Refer to the Code for Design on Subgrade of Railway (TB 10001-2016)

Source(s): Authors’ own work

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