Influence of Backfill Compaction on Mechanical Characteristics of High-Density Polyethylene Double-Wall Corrugated Pipelines

Table 3

Properties of soil used for numerical simulation.

Properties	Lay 01	Lay 02	Lay 03	Lay 04	Lay 05	Lay 06	In-suit soil
Dry density (kg/m^3)	2020	1670	1670	2020	2000	1800	1850
Related density (%)	90	95	95	90	85	90
Elastic modulus (MPa)	10	15	15	7	9	9	30
Poisson’s ratio	0.30	0.26	0.26	0.23	0.30	0.32	0.35
Cohesion (kPa)	0.50	0.25	0.25	0.30	0.35	0.40	0.40
Friction angle (°)	35	31	25	28	30	27	30