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남정만 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-
A series of torsion shear tests were performed on the Santa Monica Beach Sand to investigate the effect of rotation of principal stress axes, which was able to apply independently vertical stresses, confined pressure and torque, respectively. From results of torsion shear tests, the directions of plastic strain increment vector at failure coincided with the stress vector in physical stress space and showed a good agreement with nonasscciate flow rule in work-space. The experimental results also indicated that the directions of major principal strain increment essentially coincided with the directions of major principal stress increment at small stress levels or in the early stage of tests. As the stress level increased towards failure, the major principal strain increment direction approached and essentially coincide with the major principal stress direction.
남정만,윤중만,이용두 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
An extensive instrumentation systems are designed on twenty-one anchored excavation sites and twelve braced excavation sites to observe the deformation behavior of the earth retention walls. The excavation sites are divided two cases by construction conditions: one is a stable construction site and the other is an unstable construction site. In this excavation sites, the anchor, strut load and the horizontal displacement of walls were measured from load cell and inclinometer. The different behavior of anchored and braced walls are precisely investigated on the basis of field measurements. And an empirical construction criterion is established to judge and ensure the stability of earth retention wall by the relationship between the earth pressure and the horizontal displacement of wall measured from both stable and unstable construction sites.
남정만,김군학 濟州大學校 海洋硏究所 2004 해양과환경연구소 연구논문집 Vol.28 No.1
Recently, the efficient handling of recycled concrete becomes a problem, as re-development of city centers and apartments are .being activated in Korea. The effort to utilize the concrete aggregate as supplementary base course of road, back filling and refilling materials has been launched since the early 1980s, and the utilization method has been constantly studied and reviewed to commercialize it in various countries including the United States and European countries. The concrete waste matters have the attributes that they need a vast area to reclaim, and their biological degeneration is not conducted with time passage. 70∼80 thus, the concrete waste matter's potential utilization is very high. According to the data studied so far, the CBR value of recycled aggregate was 60.5%, the maximum dry density was 1.98 g/㎤ at 11.5% in optimal function ratio, abrasion was 21.8% and absorption rate was 5.65%. As a result of analyses on the domestic laws and on the quality standards through gathering waste concrete from construction sites within Jeju Island, the recycled waste concrete aggregate may e judgingly used as the material for back filling, refilling, road bed filled ground and supplementary base course of road materials.
남정만 제주대학교 해양과학연구소 1996 해양과환경연구소 연구논문집 Vol.20 No.0
The finite element method and the boundary element method are applied to analyze stress and deformation developed in the elastic ground which an urban tunnel with various section is excavated. The anaIytical results by both the finite element method and the boundary element method show relatively good agreement with Mindlin ’s solution. And this paper shows that the boundary element method is more favourable than the finite element method because the work to obtain same accuracy is simple and computing time is short. Also, to establish a reasonable design method for urban tunnel. minute investigation is carried out to variation of stress deformation around tunnel, subsidence and heave of ground etc.