EJPAU 2011. Malinowska E. FLOW-PUMP TECHNIQUE AS A CONSTANT VELOCITY METHOD OF FLOW MEASURMENT IN SOFT ORGANIC SOILS

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2011
Volume 14
Issue 4

Topic:

Civil Engineering

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Malinowska E. 2011. FLOW-PUMP TECHNIQUE AS A CONSTANT VELOCITY METHOD OF FLOW MEASURMENT IN SOFT ORGANIC SOILS, EJPAU 14(4), #06.
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

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