The Influence of Dynamic Replacement Method on the Adjacent Soil

Sękowski, J.; Kwiecień, S.; Kanty, Piotr

doi:10.1007/s40999-017-0231-6

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…The direction of the aggregate propagation is best visible when the floating columns (not reaching the load-bearing layer) are formed -see Fig. 18 -they are characterized with semi-circular bases [7]. With further drops of the pounder the diameter of the zone with the replacement material that is being pushed down, increases until its bottom reaches the bearing layer.…”

Section: Discussionmentioning

confidence: 99%

“…Dynamic replacement columns are used to improve mainly very soft and soft organic and fine soils (for weak coarse soils vibratory methods or dynamic compaction are better suited). The DR execution process improves the bearing capacity and stiffness of the subsoil [7] by, simply, replacement of the soft soil with a stronger one. The time of consolidation is noticeably reduced as well [8].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Kwiecień

Kowalska

2023

Architecture, Civil Engineering, Environment

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Dynamic replacement (DR) is a ground improvement technique that has been used now for almost 50 years. During the formation of a DR column a crater is created which is then filled with a coarse material and compacted again. The length, diameter and shape of such a column cannot be observed directly, which makes the design and execution more troublesome. In the article presented are the dimensions and shapes of 18 columns from eight different test fields. They were formed by means of pounders of various masses (9 or 11.5 Mg) and dimensions (1.00 or 1.05 m in diameter, 1.8 or 2.0 m in height). Based on the observations and measurements, it was concluded that the shape and diameter of a DR column is influenced by the parameters of the soft soil that is supposed to be improved (its thickness, physical state and location in the profile), as well as by the diameter of the pounder. It was revealed that, as the length of the columns increased, the column shapes changed from: a cylinder, through a truncated cone, a barrel to an asymmetric barrel. The diameters of all of the columns were 1.4–2.8 times larger than the diameters of the used pounders and the largest values were noted along the depth of the weakest layer. The presented results may be useful to the profession. When the thickness of the weak soil, its type and state are known and the technological parameters are similar to the ones presented in this paper, it is possible to predict the shape and diameter of the columns depending on the diameter of the pounder.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Kwiecień

Kowalska

2023

Architecture, Civil Engineering, Environment

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“…They depend on the distance from the column, elapsed time, and the type and the initial condition of the soil. During the strengthening process, the soil softens in close vicinity of the column, but then soil parameters increase over time [ 5 ]. Some authors have observed the strengthening of the surrounding soil [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Load Plates Diameters, Shapes of Columns and Columns Spacing on Results of Load Plate Tests of Columns Formed by Dynamic Replacement

Kwiecień

2021

Sensors

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The dynamic replacement method is used to strengthen the subgrade of objects, usually up to 5 to 6 m thick. After the improvement process, acceptance tests in the form of load testing are carried out. Interpretation of the test results can cause some difficulties. Dynamic replacement results in a situation where columns of different shapes, loaded with plates of diameters usually smaller than the head diameter and in the vicinity of adjacent columns, are subjected to load tests. In order to demonstrate the influence of these factors, a spatial model of soil strengthened by dynamic replacement, comprising four material zones, was calibrated on the basis of load testing. The following models were used in the analysis: linear-elastic, elastic–perfectly plastic (Coulomb–Mohr) and elastic–plastic with isotropic hardening (Modified Cam-Clay). This formed the basis for 105 numerical models, which took into account the actual shapes of the columns made at various spacings, subjected to load tests with plates of various diameters. The analyses of the settlements, calculated moduli and stress distribution in the loaded system showed how the results were significantly influenced by mentioned factors. This implies that the interpretation of the results of load tests should be based on advanced spatial numerical analyses, using appropriate constitutive models and including the considered factors.

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Application of Dynamic Replacement to Lateritic Clay

et al. 2023

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The dynamic replacement (DR) method is a widespread alternative in several countries around the world as a technique to improve soils with low bearing capacity, compressible, collapsible, etc. It is an established method used on soft clays, silts, sandy silt, and/or sedimentary sandy soils with low bearing capacity. However, there are no published scientific reports on the use of this method on saprolite and/or laterite soils typical of tropical regions.Therefore, this paper aims to validate the use of the Mohr-Coulomb failure criterion using the finite element method (FEM) as a tool for predicting the elastoplastic behavior of lateritic clayey soils improved by the dynamic replacement method. For this purpose, 6 plate loading tests were performed on DR columns with and without cement-improved soil reinforcement layers (fine sand + Portland cement) with different heights and different DR column depths were numerically simulated in FEM based on the Mohr-Coulomb criterion. It was concluded that the use of the Mohr-Coulomb plastification criterion in FEM generated numerical simulations compatible with the responses of plate load tests performed in the field. In general, it was observed that the

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The Influence of Dynamic Replacement Method on the Adjacent Soil

Cited by 7 publications

References 12 publications

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Influence of Load Plates Diameters, Shapes of Columns and Columns Spacing on Results of Load Plate Tests of Columns Formed by Dynamic Replacement

Application of Dynamic Replacement to Lateritic Clay

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