TA445 : The stabilization of fine-grained soils using natural materials to prevent the formation of dust due to wind blowing
Thesis > Central Library of Shahrood University > Civil & Architectural Engineering > MSc > 2018
Authors:
Amir Amraei [Author], Behnaz Dahrazma[Supervisor]
Abstarct: Nowadays, arid and semi-arid areas account for about one third of the Earth's surface, and more than a quarter of the world's dry lands are affected by the phenomenon of desertification. Wind erosion and consequent dust are important indicators in the occurrence of desertification and a serious threat to arid areas. Due to its geographical location and dry climatic conditions, Iran has been affected by adverse weather conditions caused by wind erosion and storm infestations at various times. The present study aimed to stabilize erosion-prone soil using a vegetable mulch prepared from Eremurus spectabilis root powder. The effects of concentration and amount of mulch spraying on the soil erosion was investigated and the penetration and reduction of the thickness of the fixed laxyer against wind speeds of 6, 9, 12 and 15 m/s for 5 minutes was studied in the wind tunnel. Finally EC, pH, salinity and other soil elements were tested to evaluate the environmental impact of mulching. The results showed that increasing the amount of mulch spraying results in more mulch penetration in the soil and increasing the mulch concentration, despite reducing the depth of its penetration into the soil due to increasing the amount of adhesion between the soil particles, its greater resistance to wind erosion. baxsed on the results, mulches with concentrations of 0.2, 0.6 and 0.7% can stabilize the soil against the wind stream, up to a maximum of 9, 12 and 15 m/s, respectively. The results of XRD analysis showed that adding mulch to soil increased the amount of SiO2 in the soil and thereby increased the shear strength of the soil, increased yield in the stabilization process and helped to solidify the soil, and the least studied mulch Has had a negative effect on the type and amount of elements in the soil studied, which indicates the environmental compatibility of this type of mulch. The results of the SEM analysis clearly revealed a laxyer of coating on the surface of the soil and created adhesion and cohesion Determine between soil particles by using vegetable mulch. Generally, the mentioned mulching plant, the environmentally friendly mildew Sets and suitable for controlling wind erosion are prone to eroding soils. Generally, the mulch is environmentally friendly and is an appropriate option for controlling the erosion of wind erosion-prone soil.
Keywords:
#Wind erosion #Dust #Soil stabilization #Vegetable mulch #Wind tunnel Link
Keeping place: Central Library of Shahrood University
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