土木与环境工程学报

Dynamic Compaction of Backfills and its Dynamic Load Effect on Underlying Concrete Pipe

Abstract

Alula Araya Kassa, Asgedom, Asmare Mesfin and Amare Gebremedhin

In this study, the effect of dynamic vibrational compaction loads on the stability of underlying concrete pipes using finite element modeling (FEM) analysis method is investigated. The FEM is conducted on different reinforced concrete pipe (RCP) classes with variable diameters. And different parameters include; increasing backfill heights above the pipe crown, geometry related material properties, and compaction load locations are considered in the modeling. ABAQUS three- dimensional FEM is used in modeling of RCP and surrounding soils under the action of dynamic vibrational compaction loads. The FEM loads acting on the pipe walls are correlated with loads specified in ASTM C-76 resulted by Three End Bearing (TEB) experimental test known as D-load test. Therefore, the backfill height at which FEM loads equals with the TEB loads that cause 0.25 mm crack on the RCP is the critical fill depth in dynamic vibrational compaction of trench embankment.