نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 کارشناسی ارشد عمران-ژئوتکنیک، دانشگاه سمنان
2 گروه خاک دانشکده مهندسی عمران دانشگاه سمنان
3 دانشیار گروه خاک دانشکده مهندسی عمران دانشگاه سمنان
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In drainage columns, the pores are gradually cloged due to the entry of fine particles from the surrounding soil into the drainage column. 4 drainage columns were tested with the help of cells, which included single -material columns and mixed columns. On each sample, 8 tests have been performed. The materials used in these columns consist of 3 sand sizes of 0.5, 0.75 and 1 cm. In order to investigate the function of sediment levels, the soil is mixed with water, which is the percentage of mixing with water of 0, 5, 7.5 and 10 % of water weight. In all experiments, the flow of water has been dragged into the drainage columns with a head of 1 meter and after passing through the column. The amount of deposition in the drainage columns, to the type of material, the ratio of effective porosity, the ratio of ineffective porosity, the ratio of the porosity, the friction between the materials inside the column with the fine soil mixed in the water, the cavities in the surface of the materials, roughness and geometrical shape of the materials .Deposition in drainage columns reduces void ratio, reduces current passing, increased internal friction, and creates communication bridges between the fine soil and thus obstruction and elimination of column drainage function. The pre -and -after -test soil grading indicates that the particles passing through the sieve 200 are generally passed through the samples and the highest weight of the particles is precipitated, the particles greater than 0.5mm
کلیدواژه‌ها [English]
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