engleski

Relations between mineralogical compound and hydrogeological properties of typical fine grained sediments in estern Croatia

As part of the project of determination of purification parameters of fine grained sediments covering the wellfield Cerić, mineralogical and hydrogeological/geomechanical analysis were conducted on core samples from the exploration boreholes. Geomechanical analyses (grain size analyses, Atterberg limits and natural humidity and permeability testing in oedometer) and mineralogical analysis (qualitative mineralogical analysis) were conducted on drilled samples. This research will describe the relations between mineralogical compound and geomechanical properties along with description of analytics. Identification of the hydrogeological properties was carried out based on the AC classification and grain size distribution data. In such qualitative and quantitative treatise on numerous physical characteristics of the soil, triaxial texture diagram of the statistical distribution of sand, silt and clay was used. This study presents a clear functional link between permeability and specific surface area of the sample and numerous correlations between specific surface area and Atteberg limits. The values of liquid limits for every individual sample from exploration boreholes are used to calculate the mass specific surface area. Qualitative mineralogical analysis on non-oriented (powder) samples was also performed using X-ray diffraction. These analyses were performed on a total of 5 samples. Results of mineralogical analyses showed that the tested samples predominantly contain quartz and illite with muscovite which are very often the basic mineralogical elements of clay fraction. From clay minerals, kaolinite and chlorite are also present and to a lesser extent swelling clay minerals (smectite, vermiculite). The results of mineralogical analysis, (according to specific surface area) correspond well with the results of geotechnical tests, which indicate the high quality of some known relations between specific surface area and Atterberg limits.

clay mineralogy, specific surface area, particle size distribution chart, Atterberg limits,

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