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RISS 인기검색어
- 검색키워드
- 저자 : Prasidhi, A.K. (검색결과 2 건)
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Soil treatment using microbial biopolymers for anti-desertification purposes
Chang, I.,Prasidhi, A.K.,Im, J.,Shin, H.D.,Cho, G.C. Elsevier Scientific Pub. Co 2015 Geoderma Vol.253 No.-
Desertification and soil degradation are becoming more serious due to global warming and concurrent extreme climate events. Although anti-desertification efforts have been mounted worldwide, most undertakings have shown poor performance because of failure to consider soil and geotechnical aspects. Soil erosion is accelerated by reductions in soil cohesion and water retention due to the transfer of fine particles from the original ground. Thus, soil internal cohesion must be recovered to ensure effective and reliable anti-desertification attempts. In this study, soil treatment using biopolymers is suggested as an alternative method to prevent soil erosion and for revitalization, taking into consideration engineering and environmental aspects. Even as a relatively small part of the soil mass (i.e., 0.5-1.0%), biopolymers in soil have the positive potential to significantly reduce the erodibility of soil by enhancing inter-particle cohesion. Moreover, biopolymer treatment also improves both vegetation germination and soil water retention characteristics against evaporation, and therefore can provide suitable environments for plants and crops used as a desertification countermeasure in arid and semi-arid regions where annual precipitation is limited. We suggest combining biopolymers with pre-existing anti-desertification efforts (e.g., afforestation and windbreaks) on desert fronts (i.e., boundaries between arid and semi-arid regions) for best efficiency.
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Effect of Water Jet Geometric Parameters on Rock Fracturing
오태민,Awlia K. Prasidhi,조계춘,신종호 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.3
Fluid-driven rock fracturing has been attempted in the fields of mining and civil engineering. This type of rock fracturing isinitiated by applying high-pressure water to target rock. In this study, the fracturing characteristics of hard granite specimens wereexplored through experimental tests using a high-pressure water jet system. Various tests were performed to evaluate the effects ofseveral geometric parameters: standoff distance, indentation depth, and free surface condition. The fracture depth, radius, volume,and angle were measured, and then analyzed to investigate the fracturing characteristics. In addition, we prepared a theoreticalestimate of maximum shear stress via shear stress analysis using a crack-tip stress field model. In these experimental and theoreticalstudies, efficient rock fracturing was demonstrated with a combination of short standoff distance, deep indentation, and nearby freesurfaces. Meanwhile, the fracture angle for infinite free surface boundary specimens was identified as a unique value regardless ofthe standoff distance and indentation depth.
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