نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 گروه مهندسی عمران، واحد اراک، دانشگاه آزاد اسلامی ، اراک، ایران
2 گروه مهندسی عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک / بخش فنی مهندسی، دانشگاه پیام نور، تهران، ایران
3 گروه شیمی، پژوهش سرای خواجه نصیر قم، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Wind erosion of the soil surface causes dust and threatens human health and the environment. Despite numerous studies on the process of biocrust formation due to calcite deposition due to bacterial activity in coarse soils, not enough studies have been done to use this method to improve saline and alkaline silty fine soils. In this study, Sporesarcina pasteuris bacteria was used to create a biological crust on the silty soil of the Miqan wetland region (saline and alkaline soils) to prevent dust. Soil samples were prepared with different amounts of bacteria (in terms of concentration and amount of bacteria on the surface). Surface erosion of the samples was measured. To further investigate the effect of treatment on the samples, Thaw and freeze tests, scouring, cone penetration, electrical conductivity, pH and SEM, XRD, and EDS analyzes were performed on the treated and untreated samples. To compare the surface stabilization method with bacteria and conventional stabilizers, samples with similar conditions were prepared by spray method of cement and lime, and surface erosion caused by the wind was measured in them. The results of this study showed that MICP improvement for surface crust production is an effective process to control dust caused by wind erosion in the Miqan desert. Using the biocrust process, in 28-day samples, surface resistance increased by 95% and wind erosion rate decreased by 89.8%.
کلیدواژه‌ها [English]
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