Volume 1, Issue 1 (7-2003)
Abstract
(Paper pages 24-41 ) Different methods are used for landslide hazard zonation. Some of the methods are based on specific condition of the area. In this research, applicapibility of a number of landslide hazard zonation methods in Latian Dam watershed is evaluated. For this purpose Latian Dam watershed due to variety in geological condition, engineering geological characteristics, topography, geomorphology, and precipitation was selected. Different thematic layers including geology, distance from active faults, elevation, slope rate and aspect, precipitation, and vegetation cover were prepared. More than 150 single and landslide zones were recorded based on aerial photo interpretation and field survey. The data were analyzed to find out about landslide controlling factors. Considering instability controlling factors, Nilsen, Information Value, Weight of evidence, and Density area methods were used for preparation of landslide hazard zonation in the watershed. The comparison of the prepared hazard zonation maps with landslide inventory map indicates that weight of evidence and information value methods with accuracy of 99.4 and 99.7 percent respectively are most appropriate methods for preparation of landslide hazaed zonation map in similar area in Central Alborz.
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Volume 15, Issue 3 (12-2021)
Abstract
In this research work the effect of glycerol and acetone on the properties of a clay soil with low plasticity (CL) was studied through experimental tests. Contaminated soil was prepared by mixing 10, 15 and 20% pure glycerol or acetone with soil. A set of experimental tests including Atterberg limits, compaction, free swelling, Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), consolidation tests and Scanning Electron Microscopy (SEM) were conducted on uncontaminated and contaminated soil. The results showed that the effect of glycerol on contaminated soil was a reduction of Atterberg Limits, Free Swelling, optimum water content and increasing maximum dry unit weight but the effect of acetone was in the opposite trend of glycerol. These variations in the behaviors of soil were the function of percent of glycerol or acetone. In addition, the results indicated that both glycerol and acetone cause the reduction in the values of compressive strength and CBR number of soil but the reduction due to glycerol was more than the acetone. The results of consolidation test showed that the values of compression index (Cc) and swelling index (Cs) were independent of the percent of chemical fluids. The SEM results also reveal that these two contaminations cause some variations in the physical and mechanical properties of a clay soil becase of changing the structure of soil and the effect of these contaminations on the properties of soil was not the same.
Key words: hydrocarbon contamination, Atterberg limits, free swelling, Unconfined Compressive Strength (UCS), CBR and consolidation test.
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