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손호웅,Shon, Ho-Woong 배재대학교 공학연구소 2002 공학논문집 Vol.4 No.1
The vertical distribution of pore water pressure in the highly saturated sand layer under the oscillating water pressure (water wave) is studied theoretically and experimentally. By experiments it is shown that the water pressure acting on the sand surface propagates into the sand layer with the damping in amplitude and the lag in phase, and that the liquefaction, the state that the effective stress becomes zero, occurs under certain conditions. These experimental results are explained fairly well by the same theoretical treatment as for the ground water problems in the elastic aquifer. The main characteristics of liquefaction clarified by the analysis are as follows: 1) The depth of the liquefied layer increases with the increase of the amplitude and the frequency of the oscillating water pressure. 2) The increase of the volume of the water and the air in the layer increases the liquefied depth. Especially the very small amount of the air affects the liquefaction significantly. 3) The liquefied depth decrease rapidly with the increase of the compressibility coefficient of the sand. 4) In the range beyond a certain value of the permeability coefficient the liquefied depth decrease with the increase of the coefficient. 변동수압에 의한 해저 포화 사질층의 연직 간극수압 분포를 이론 및 실험적으로 연구하였다. 실험에 의해 모래표면에 작용하는 수압은 모래층으로 전달되며 진폭이 감쇠하고 상이 지연되며, 유효응력이 0이 되는 액상화 현상이 특별 조건에서 발생한다. 이러한 실험결과는 탄성 대수층에 대한 지하수문제와 같은 이론으로 잘 설명된다. 해석에 의한 액상화의 주요 특징은 다음과 같다: 1) 액상화 심도는 진폭 및 변동수압의 주파수 증가에 따라 증가한다. 2) 수량을 증가시키고 모래층 내의 공기가 많아짐에 따라 액상화 심도가 증가한다. 특히, 공기의 적은 양도 액상화에 크게 영향을 미친다. 3) 압축율이 증가함에 따라 액상화 심도는 감소한다. 4) 투수 계수값이 어느 특정값 이상이 되면 투수계수값이 증가함에 따라 액상화 심도가 감소한다.
손호웅,Shon, Ho-Woong Korean Society of Earth and Exploration Geophysici 2005 지구물리 Vol.8 No.3
A discussion of a method has been used with success in terrain modelling to estimate the height at any point on the land surface from irregularly distributed samples. The special requirements of terrain modelling are discussed as well as a detailed description of the algorithm and an example of its application.
손호웅,Shon, Ho-Woong 배재대학교 공학연구소 1997 공학논문집 Vol.2 No.1
본 논문에서는 토목.건축 구조물의 시공감리를 위한 지구물리탐사방법의 적용 가능성을 연구하였다. 이를 위하여 제주도 삼양지역에 건설된 삼양수원지의 지하 차수벽의 시공상 부실공사 여부를 지구물리학적인 방법중 전기탐사(전기비저항, 자연전위법)를 중심으로 연구하였다. 수원지 내부에 2개의 물리탐사 측선을 배열하고 부실 시공에 의한 해수유입 여부를 알아내기 위해 각 측선에서 간조와 만조 때 각각 1회씩 전기비저항값을 측정하였으며, 정확성을 높이기 이해 각 측선에서 자연전위법(self-potential method) 탐사를 간조와 만조에 전기탐사와 함께 실시하였다. 탐사결과 얻어진 전기비저항값과 전위차로부터 수원지에서의 시간에 따른 지하구조를 해석함으로써 부실 공사 여부를 해석하였다. 연구결과 만조와 간조 때의 전기비저항값의 차이 및 분포로부터 지하를 통해 해수가 유입됨을 알 수 있었으며, 각 측선에서의 자연전위값의 이상치를 보이는 것은 해수의 유입경로를 보여주는 것으로 판단되어 삼양수원지의 해수침입원인은 부실 공사와 사후처리의 미흡으로 인한 것으로 판단되었다. 본 연구결과 비파괴검사의 일환인 전기비저항탐사와 자연전위탐사 등 지구물리탐사방법이 구조물의 시공감리에 유용함을 시사하고 있다. It is not possible to define the earth's interior because of it complicity. However, it can be interpreted directly and/ or indirectly. Geophysics is the subject of this study. To study the possibility of construction supervision by geophysical method, geophysical prospecting was performed and studied at the SamYang pumping well area in Cheju Island, where, although underground dam was constructed, the saline water invade the pumping well area. This study focuses on the construction supervision by electrical measurements. Two electric resistivity survey lines are installed in the pumping well site, and at each line electric survey was conducted at ebb and flow tides. To increase the data quality SP (self-potential) survey was also performed. As a result the geophysical exploration methods explained the defect of construction well, and It shows that geophysical probe can be a useful tool for the construction supervision.
고밀도 레이저 측량, 지반조사 및 고유진동수 측정에 의한 첨성대 구조물의 안정성 평가
손호웅(Shon Ho Woong),이성민(Lee Sung Min) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Structures show the phenomona of deformation and lowering of function with time-lapse. Among the causes, long-time weathering exposed to natural and artificial environments, and changes of geotechnical conditions or accumulation of initial deformation elements are the most important factors. This study aims the structural assessment of cultural property, ChumSungDae, located in Kyeongju city, Kyeong-Nam Province, Korea. It was built about 1,300 years ago, and has undergone deformation and ground-subsidence with time-lapse. Non-destructive evaluation techniques were applied to the ChumSungDae to protect it. Because of this reason, 3D precise laser scanning surveying to measure the displacement, and geophysical exploration to study the subsurface distribution of geotechnical parameters, were adopted. Also, natural frequencies were measured from real and model of ChumSungDae to study the characteristics of vibration. Following results by the above methods were achieved: 1. From the analyses of reverse engineering by 3D laser scanning, ChumSungDae overall declines 0.7°eastward, 1.9°northward, totally about 2°to the North-East direction. It moved maximum 29mm to the East, 171mm to the North and 173mm to the North-East direction. 2. Results of electric DC resistivity and GPR show the anomaly zone to the North-East direction which coincides with the surveying. Subsurface distribution of shear wave velocity(Vs) and compressional wave velocity(Vp) achieved by surface and refracion seismic method show the subsurface physical boundary. 3. Natural frequencies were measured from real and 1/10 scale-reduced model of ChumSungDae Natural frequency was 17Hz when there is no deformation in the model. With the increase of declining angle, natural frequency was down to 14Hz. Natural frequency of real ChumSungDae were 4.52Hz in the North-South direction and 4.59Hz in the East-west direction.