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유지형 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
Model tests are conducted to evaluate the effectiveness of the passive isolation barrier in reducing the amplitude of vertical and horizontal ground motion. Straight barrier with styrofoam is used at 0.8m distance from the source. The barrier is 0.8m long, 0.5m deep, and 5cm in width. The model sand box is about 3.0m×3.0m dimension and 1.5m deep and is constructed with an absorbing perimeter and bottom of styrofoam to minimize reflection of wave energy. The compressive and shear wave velocities of sands are determined from the criss-hole test performed on the surface. And the spectral analysis of surface wave (SASW) tests are performed to estimate the elastic properties of sands from the dispersion curve of Rayleigh waves. From the analysis of passive isolation tests, it is found that magnification of vertical and horizontal motion are both occurred in front of barrier. It is also found that amplitude reductions are 63% in vertical and 59% in hoizontal motion just behind barries, and 36% in vertical and 59% in horizontal motion at 1.1m distance from the source.
柳知衡 慶一大學校 1999 論文集 Vol.16 No.2
Many structures are constructed on and/or under soil. The stability of structures is based on the behavior of foundation soils caused by applied loads. It is very important to determine exactly the geotechnical properties of foundation soils for the rational design or the analysis of soil foundation. But in case of small or minor project, it is more economical and practical to estimate the required geotechnical property from other properties. The relationship of geotechnical properties are often needed. For this study, the geotechnical properties are collected from geotechnical investigation data of various construction projects in Kyungpook province, Korea. From the regression analysis of collected geotechnical properties, it is proven to have high correlation between properties for sandy soil and cohesive soil respectively. It is also suggested correlation equations between properties for sandy soil and cohesive soil.
柳知衡 慶一大學校 1999 論文集 Vol.16 No.5
Ground vibrations due to various construction working and moving rapid train influence on the residential enviroment and the stability of structures. The research of more effecrive screening method for ground vibrations is required. In this study, three types of screening barrier which are the open trench, bentonite slurry fill, and concrete fill are selected. Numerical models are structured for each type of screening barrier, varying with the frequencyof loading, distance from the source of the vibration, and depth of barrier. Each model is analyzed using FLAC computer program. As the results of numerical analysis, it is shown that the open trench screens surface waves very highly at less than 5% ARE(Amplitude Reduction Factor) which indicates the screening effect. It is found that the screening effect of bentonite slurry fill smoothly increase with the increase of source frequency, starting at two times wave length(λ) of distance from barrir depth of 1.5 λ.
柳知衡 慶一大學校 2002 論文集 Vol.18 No.-
Due to the spatial limitation in the city, it is predicted that underground construction will be dominated the next few decates. The vibration effects of the underground excavation has been analyzing in hopes to minimize the damage done to existing structure. For the minimization of structural damage, the ground motion due to the blasting in the city should be predicted. It is affected by many factors such as the distance from the source, amount of detonation powder, ground profile, conditions, etc. From the regression analysis of ground motions measured in the selected blasting project, the velocities of ground motion in three directions are developed respectively. The regression equation of sound pressure due to underground blasting is also developed.