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• W1781163703 abstract "Alluvial soils and overconsolidated clays constitute the most soils of Cyprus. The alluviums show relatively high apparent strength in their dry state. However, with saturation their strength decreases. The clayey parts of the alluviums have low to medium swelling potential. Overconsolidated swelling clays of Cyprus occurred as a result of the alteration of the Troodos ophiolite and the pelagic sedimentary cycles that followed in the post Createceous period. The calcium corbonate content of the clays (marls) originated from the limestones and dolomites of the Kyrenia zone. There is widespread damage to the buildings, major roads and highways all over the country which were founded on swelling clays. Clays of Cyprus can be divided into five groups. 1.Clays of Mamonia Complex, 2.Bentonitic Clays, 3.Clays of Kythrea Group, 4.Mesaoria clay zone and 5.Alluvial clays. Large parts of Nicosia is covered by man made fills, alluvial soils and swelling clays Swelling clay problems occur continuously every year due to the soil expanding in the winter and shrinking in the summer. Nicosia is almost flat lying at about 110 - 160m above the mean sea level and is located between the Kyrenia and Troodos ranges. Several streams are flowing from south and north. The soils of Nicosia are; Man made fills, Alluviums, Mesaria Clay Zone, Kalavasos Formation and Kythrea Group. The Kythrea group is widespread in the north of Nicosia. Alternation of sandstone-siltstone-marl-claystone are widespread within the group. The group is only observed in the Turkish Republic of Northern Cyprus and its overconsolidated clays exhibits low to high swelling potential. Mesaria Clay Zone is widespread in the south of Nicosia and consists of gravel-sand-claystones. Overconsolidated Nicosia clays exhibits low to very high swelling potential. Nicosia is covered by extensive alluvial deposits of up to a thickness of 22 m. SPT, UD, and core samples taken from the boreholes are tested in the laboratory for mechanical (grading) analysis, moisture content, unit weight, specific gravity, Atterberg limits, and CaCO 3 content. X-ray diffraction (XRD), Scanning Electron microprobe (SEM) and Energy Dispersive X -Ray (EDX) analysis are also conducted. The properties of Nicosia walled city soils are determined by boreholes drilled in five different locations between 2001 and 2007. The soils are man made fills, alluviums, Nicosia clays, Kalavasos Formation and Kythrea group. Man made fills and alluviums are present from the surface to between 7.20 m and 22.00 m depth. The water table is between 4.90 m and 10.00 m. There is no swelling and shrinkage within the walled city. The highest liquid limit ( LL) values of the analyzed samples are present in yellowish to light grey weathered, oxidized Nicosia clay (marl). Clay and montmorillonite contests are increasing within these samples. CaCO 3 contents are higher in the light coloured samples. The Liquid limit ( LL) values are decreasing with the increasing amount of CaCO 3 . The lowest SPT N values are present in the fine grained alluvium deposits. The SPT N values of Nicosia clays ( marls) are between 33 and 75. The semi quantitative X-ray diffraction (XRD), Scanning Electron microprobe (SEM) and Energy Dispersive X -Ray (EDX) analyses indicated that the predominant clay mineral is montmorillonite (smectite), illite and chlorite or kaolinite are the other abundant clay minerals. Calcite is the major mineral of the clays (marls), quartz and feldspar are also present at high amounts. Montmorillonite (smectite) with an amount ranging between 10 and 30%. illite and chlorite or kaolinite with an amount ranging between 5 and 10%. Calcite with an amount ranging between 30 and 65% is the major mineral of the alluviums and Nicosia clays (marls). The other minerals are quartz ranging between 2 and 6%, feldspar ranging between 4 and 15 %, and dolomite ranging between 2 and 9%. EDX analysis for the Nicosia clays indicated that Si, Al, K and Mg peaks are together. Therefore predominant clay minerals are montmorillonite (smectite) and illite. The high amount of Fe %10 it could be the result of the ofiolitic Fe minerals. Despite the overconsolidation character the soils have high porosity. Keywords: Atterberg limits, montmorillonite, calcium carbonate, Nicosia clays ." @default.
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• W1781163703 date "2012-05-01" @default.
• W1781163703 modified "2023-09-26" @default.
• W1781163703 title "Lefkoşa surlariçi zeminlerinin özellikleri" @default.
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