Metropolitan Tehran is located on the highly cemented granular deposits in upper central to northern parts of the city which is fairly close to the Alborz Mountains with altitudes around 4000m. Due to the specific geological conditions, the deposited alluviums are very non-homogeneous in different zones, but generally the cementation is high to very high contributing to cohesions of up to 160 kPa, mostly resulted from the existence of calcite. The main objective of this paper is to investigate experimentally the effect of calcite content on the cohesion and angle of internal friction. A special chemical analysis method consisting of solution in HCl was conducted to measure the calcite content at 10 different locations in northern Tehran. In order to simulate the effect of calcite content, soil samples with different lime percentages (1, 3, 5 & 7 %) were prepared and cured in the laboratory, and large scale direct shear tests were performed. The results showed considerable effect of cement content (calcite) on the soil behavior and shear strength, in particular substantial increase in cohesion.
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