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- Title
Experimentelle, analytische und numerische Untersuchungen zur Verdichtungsprognose von Sand bei der Rütteldruckverdichtung.
- Authors
Kimmig, Ivo; Triantafyllidis, Theodoros; Knittel, Lukas
- Abstract
Experimental, analytical and numerical investigations on vibro compaction of sand Loosely bedded non‐cohesive soils are successfully improved in numerous applications through the use of deep vibrators in vibro compaction treatments. However, a reliable, physically sound prognosis of the compaction success can be decisive for the economic implementation of the measures. The propagation of waves, large‐scale plastic deformations, pore water pressure build‐up and material transport as a result of the movement of the deep vibrator are decisive ingredients of compaction success, but cannot be taken into account as a whole in simulations. In order to improve the prediction quality, a procedure is proposed in which a multidimensional strain amplitude is calculated to describe the occurring deformations and then the accumulation of the deformations due to a multitude of cycles (rotations of the vibrator) is estimated with an accumulation model. For this purpose, analytical and numerical approaches are available which consider a limited soil area around the deep vibrator and provide comparable, plausible results both for wave propagation and for the strain amplitude. In order to investigate the deformation behaviour of a sand at strain amplitudes up to the percentage range, hollow cylinder triaxial tests with a cyclic rotation of the base plate were performed, which showed a predominantly homogeneous strain field. By recalculating the laboratory tests with an accumulation model for large strain amplitudes and adjusting the model parameters, it is possible to describe the deformation behaviour in the case of vibro compaction and to use it for the estimation of the grid dimension for the densification points by extending the procedure.
- Subjects
PORE water pressure; SILT; THEORY of wave motion; SAND; IRON &; steel plates; COMPACTING
- Publication
Bautechnik, 2019, Vol 96, Issue 10, p760
- ISSN
0932-8351
- Publication type
Article
- DOI
10.1002/bate.201900038