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- 저자 : 유지형 (검색결과 215 건)
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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.
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유지형,곽기봉,김대성 한국도로학회 2015 한국도로학회논문집 Vol.17 No.6
PURPOSES: This study intends to develop an inorganic soil pavement material using industrial by-products and to evaluate its applicability as a road pavement material. METHODS: In this study, a compressive strength experiment was conducted based on the NaOH solution molarity and water glass content to understand the strength properties of the soil pavement material according to the mixing ratio of alkali activator. In addition, the strength characteristic of the inorganic soil pavement material was analyzed based on the binder content. The performance of the soil pavement was evaluated by conducing an accelerated pavement test and a falling weight deflectometer (FWD) test. RESULTS: As a result of the soil pavement material test based on the mixture ratio of alkali activator, it was identified that the activator that mixed a 10 M NaOH solution to water glass in a 5:5 ratio is appropriate. As a result of the inorganic soil pavement materials test based on the binder content, the strength development increased sharply when the amount of added binder was over 300 kg; this level of binder content satisfied 28 days of 18 MPa of compression strength, which is the standard for existing soil pavement design. According to the measured results of the FWD test, the dynamic k-value did not show a significant difference before or after the accelerated pavement testing. Furthermore, the effective modulus decreased by approximately 50%, compared with the initial effective modulus for pedestrian pavement. CONCLUSIONS: Based on these results, inorganic soil pavement can be applied by changing the mixture proportions according to the use of the pavement, and can be utilized as road pavement from light load roads to access roads.
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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.
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유지형,이승원,김대성 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.2
TDR(Time Domain Reflectometry) is a method of locating the depth to a shear plane or zone in a landslide. TDR uses an electronic voltage pulse that is reflected like radar from a damaged location in a coaxial cable. To monitor slope movement, coaxial cables are grouted in boreholes and interrogated using a cable tester. Characteristic cable signatures can be stored and compared over time for changes, indicating slope movement. In this study, there were conducted two types experiments for analysis of TDR signal. The first type is shear experiment which is obtain relationship of shear displacements and TDR signals. The other one is crimp experiment which is obtain relationship of coaxial cable crimp depth and TDR signals. As the results, it is found that relationship of shear displacements and the TDR signals is polynomial. Also coaxial cable crimp depth and TDR signals were linearly decreasing as the coaxial cable is increasing. And growing the deep of crimp, Increase decline rate of reflection signal is increasing by coaxial cable length. Because loss is growing by the pulse energy. 본 논문에서는 동축케이블과 TDR(Time Domain Reflectometry : 시간영역반사법) 기법을 이용하여 실내실험을 통하여 전단변위에 따른 반사 신호의 변화를 분석하여 전단변위와 반사 신호의 상관관계를 도출하였으며, 크림프(crimp) 실험을 통하여 크림프의 깊이에 따른 동축케이블 길이와 반사 신호의 상관관계를 도출하였다. 전단변위에 따라 반사 신호의 변화가 가장 큰 지점의 값에 대한 회귀 분석을 실시한 결과 전단변위에 대한 반사 신호가 2차 다항식의 관계를 가짐을 알 수 있었다. 또한 크림프 깊이에 따른 케이블 길이와 반사 신호와의 상관관계는 선형적인 관계를 나타내고 있으며, 크림프의 깊이가 커질수록 케이블의 길이에 대한 반사 신호의 감소폭이 증가함을 알 수 있었는데, 이는 크림프를 지나는 동안 펄스 에너지의 손실이 증가한다는 것을 나타내며, 크림프의 깊이가 깊을수록 펄스 에너지의 손실이 더 증가한다는 연구결과를 도출할 수 있었다.
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