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Wpływ wybranych czynników na geometrię kolumn iniekcyjnych

100%

Wanik L. , Bzówka J.

2012

tom z. 59, nr 3/IV

117-124

W artykule przedstawiono wpływ rodzaju i stanu gruntu, systemu iniekcji oraz parametrów technologicznych iniekcji strumieniowej na geometrię i kształt kolumn iniekcyjnych.

The presented examples show that type and state of the soil, jet grouting system and technological parameters of jet grouting technique influence the shape and geometry of jet grouting columns. The authors hope to create a data base with the information of subsoil conditions in which jet grouting columns are created, technological parameters of jet grouting system used, the data of the shape and geometry of jet grouting columns (after excavation of jet grouting columns) and the values of soilcrete strength parameters that will help engineers in better estimation of the shape and geometry of jet grouting columns.

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

100%

Kwiecień S. , Kowalska M.

tom Vol. 16, no. 1

71--84

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.

Wzmacnianie podłoża gruntowego metodą wymiany dynamicznej

80%

Kwiecień S.

tom nr 5

59--62