INFLUENCE OF INTERFERENCE ON FAILURE MECHANISM OF CLOSELY CONSTRUCTED CIRCULAR FOOTINGS ON REINFORCED SAND

摘要

The influence of reinforcement on the failure mechanism and displacement fields of soil of spread and interfering circular footing on cohessionless granular soil has been studied in this paper. The analyses pursued using finite difference method based on commercially available code, FLAC3D (Fast Lagrangian Analysis of continua). The behavior of soil is assumed to be based on Mohr-coulomb criterion with non-associated flow rule by assuming 0≤ψ≤Φ. To ensure the reliability of numerical method to predict accurately results, numerical results of spread circular footing were compared with the available data from other experimental research. This comparison shows satisfactory agreement. Parametric studies were performed subsequently. The results indicate that the footing interference causes some directional difference in the soil displacement field and failure mechanism of closely spaced footings subjected to vertical loads without eccentricity with respect to spacing between two neighboring footings. In addition, the results show that there exists a significant improvement in the behavior of interfering footings reinforced with reinforcement layers.