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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,윤중만,이용두 제주대학교 해양연구소 2000 해양자원연구소연구보고 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 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 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 nonassociate 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,홍원표 한국지반공학회 1993 지반 : 한국지반공학회지 Vol.9 No.4
세 주응력을 서로 독립적으로 조절할 수 있는 입방체형삼축시험기를 이용하여 모래에 대한 일련의 배수삼축시험이 실시되었다. 실험결과 모래의 응력 -변형률거동과 강도는 중간주응력의 크기에 따라 각기 다른 특성을 보이는 것으로 나타났다. 우선 최소주응력이 일정한 상태에서 중간 주응력이 증가함에 따라 파괴시의 축변형률 e1은 감소하는 경향이 있으며 체적팽창현상은 증가 하는 것으로 나타나고 있다. 그리고 내부마찰각은 축차응력비 b가 증가함에 따라 증가하다 b가 1 부근에 접근하면서 약간 감소하는 경향을 보이고 있다. 한편 Mohrfoulomb규준은 모래의 파괴 강도를 과소산정하는 경향을 보이고 있으나 Lade의 파괴규준은 시험치와 좋은 일치를 보이고 있다. A series of drained triaxial tests on sand was performed using the cubical triaxial appaiatus, in which three principal stress could be loaded independently. The test results indicated that the intermediate principal stress influenced on both stress strain behavior and strength of sand. The axial strain at failure decreased and volumetric strain increased with an increase of the intermediate stress under constant minor principal stress. The internal friction angle of sand increased in general with increase of the deviator stress ratio b(=(G.:-c, )1(G, -G, )) except slight decrease of the internal friction angle as b value approached to 1. Finally Lade's failure criterion presented good coincidence with the exper imental strengttL while Mohr Coulomb failure criterion underestimated the experimental strength.