The short- and long-term compressive behavior of high-density polyethylene geonet and geocomposite under inclined conditions Available to Purchase

The short- and long-term compressive behaviors of a high-density polyethylene (HDPE) geonet at five inclined conditions—horizontal (0°), 1(V)-to-9(H) (6.3°), 1-to-5 (11.3°), 1-to-4 (14.0°), and 1-to-3 (18.4°)—were evaluated. The results of the short-term tests indicate that the compressive strength decreases linearly with inclined angle, whereas the compressive strain increases. The long-term compressive behavior (i.e. creep) was evaluated using the stepped isothermal method (SIM) at applied stresses of 10%, 20% and 30% of the normal compressive strength. The creep strain increases with inclined angle at all applied stresses. At 10% applied stress the primary creep deformation is obtained, while the secondary and tertiary creep stages are detected at the two higher stresses. The relationship between compressive behavior and the rollover of upper ribs of the geonet is established. The geometry of the geonet, particularly the inclined angle of the ribs, is found to be critical to the short- and long-term behavior of the geonet. In addition, the short- and long-term compressive behavior of the geocomposite was evaluated at horizontal (0°) and 1-to-4 (14.0°) to investigate the effects of thermally bonded geotextiles. The results are different from those of the geonet alone owing to the localized interface friction between the needle-punched nonwoven geotextile and ribs.