نوع مقاله : علمی- پژوهشی
نویسندگان
1 دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
2 عضو هیأت علمی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This investigation was carried out in an area within Ziarat- Gorgan Forest Management Project. The materials and methods consisted of two stages: 1- Informantion and map collection and preparation, 2-Soil mechanics tests.
Different maps including geology, hydrography, slope percentage, slope direction and soil flow were obtained and made. Overall, 30 soil samples were collected by random – systematic method which were located near the main and secondry roads. The mechanical properties of the soil samples, including natural water content, optimum water content, liquid limit (LL), plastic limit (PL) and particle size distribution were tested. The results showed that the soil moisture was high and sometimes as high as the plastic limit. The liquit limit of half of the soil samples was more than 50 percent. Overall, based on U.S.C.S method, four soil types were determined: CL, ML, MH and CH (C, M, L, H, represents clay, silt, low LL and high, respectively). Finally, based on soil mechanical properties and solpe direction and percentage, the soil stability map was made. The map consisted of three stability classes: 1-Low stability, 2-Medium stability and 3-Approximate stability.
کلیدواژهها [English]
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