Volume 14
Issue 4
Civil Engineering
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume14/issue4/abs-06.html
FLOW-PUMP TECHNIQUE AS A CONSTANT VELOCITY METHOD OF FLOW MEASURMENT IN SOFT ORGANIC SOILS
Edyta Malinowska
Department of Geotechnical Engineering,
Warsaw University of Life Sciences - SGGW, Poland
ABSTRACT
In this paper the results of the relationship between pore pressure differences and time obtained in laboratory flow-pump technique tests in soft organic soils are presented.
The Soil-Water Characteristic is necessary to predict and calculate the real amount of vertical and horizontal deformations which depend on consolidation process and are relatively large in soft organic soils. The consolidation curve is changeable with the different values of load. In the deformation process of soil skeleton, under loading, the porosity decreases and causes the changes of permeability characteristics. Considerable differences in flow parameters between soft, cohesive and uncohesive soils demand to use various methods of water flow measurement in the subsoil under the engineering constructions. The laboratory methods for permeability measurement should model the main course of in-situ flow for fully saturated soils.
Because of very week organic soils structure and specific properties, such as, high porosity, low shear strength and high initial permeability which decrease during consolidation, the method of flow measurement should be suitable. The results obtained in flow-pump laboratory tests indicated that the constant velocity method is very optimized and proper to measure the flow parameters in soft peats.
Key words: water flow characteristic, consolidation process, deformations, organic soils, peat.
Edyta Malinowska
Department of Geotechnical Engineering,
Warsaw University of Life Sciences - SGGW, Poland
Nowoursynowska Str. 159, 02-776 Warsaw, Poland
email: edyta_malinowska@sggw.pl
Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.