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

Table 2

Basic properties of the field-test soil.

Properties	Value
In-suit soil
Maximum dry density (kg/m^3)	1549
Water content (%)	12
Liquid limit (%)	25.9
Plastic limit (%)	17.3
Void ratio	42.3
Backfill sand
Maximum dry density (kg/m^3)	1730
Coarse sand (0.5∼3 mm) (%)	35
Medium sand (0.35∼0.5 mm) (%)	57
Fine sand (0.25∼0.35 mm) (%)	8
Grade	120