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Dynamic replacement: the influence of pounder diameter and ground conditions on shape and diameter of the columns

Kwiecień Sławomir, Kowalska Magdalena

Architecture Civil Engineering Environment

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2023

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Vol. 16, no. 1

71--84

EN

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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Ulepszanie podłoża. Terminologia i klasyfikacja metod

Madej J. S.

Inżynieria Morska i Geotechnika

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2015

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nr 3

525--528

PL

Analiza definicji i interpretacji terminów, dotyczących ulepszania podłoża, a stosowanych w odniesieniu do podłoża, jak i do gruntów, takich jak: wzmacnianie, zbrojenie i modyfikacja. Klasyfikacja metod ulepszania gruntów zawierająca tylko cztery kategorie metod: wzmacnianie podłoża poprzez zmianę stanu i poprzez zmianę składu, zbrojenie podłoża i konstrukcje z gruntu zbrojonego.

EN

An analysis of term definitions and interpretations, concerning the ground improvement, connected to a ground and to a soil as well including: treatment, reinforcement, modification and strengthening. The classification of soil improvement methods, consisting four categories of methods: ground strengthening by a state change and by a composition change, ground reinforcement and reinforced soil constructions.

3

Praktyczne aspekty ulepszania podłoża gruntowego pod nawierzchnie lotniskowe spoiwem SILMENT CQ-25

Lewicki P.

Drogownictwo

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2008

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nr 1

26-28

PL

Budimex-Dromex SA testował spoiwo SILMENT CQ-25 do wzmacniania podłoża gruntowego pod nawierzchnie lotniskowe. Badania wykazały, że skuteczność tego spoiwa jest porównywalna do wapna, z tym że efekt jego działania jest stały. Stwierdzono, że lepsze wyniki daje mieszanie tej samej ilości spoiwa w grubszych warstwach (do 45 cm).

EN

Budimex-Dromex Co. tested SILMENT-CQ bond to strengthening of soil subgrade of airport pavement. The tests showed, that effectiveness of this bond is comparable with effectiveness lime but the effect of its activity is continuous. It has been stated that the results are better when the same amount of the bound is mixed with higher layer of the soil (up to 45 cm).