http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
점성토로 뒤채움된 중력식옹벽에서의 인장균열 및 수평토압 : 비배수 해석
정성교,김형수 한국지반공학회 1997 지반 : 한국지반공학회지 Vol.13 No.4
Coulomb's theory has been usually used in practice to obtain lateral earth pressure against retaining wall. Such theory is based in the assumption that the lateral pressure is a tai angular distribution, since the point of applying the lateral thrust cannot be obtained by using it. However, the results of laboratory and field tests showed that the lateral pressure was not a triangular but a nonlinear distribution. To overcome the drawback of the Coulomb's theory, the different theoretical approaches(Handy, 1985. Kingsley, 1989 : Kellogg, 1993, Chung et at,1993, 1996a) were performed for gravity wall backfilled by cohesionless soil. On the other hand, for retaining wall backfilled by ,cohesive soil, theoretical analyses were carried out only on the basis of the Rankine's or Coulomb's concepts, but the equations showed different results. Here was newly derived the equations of lateral pressures under undrained condition against gravity wall backfilled by cohesive soil. They were based on the Coulomb's wedge, adopted the arching concept. Some of the equations were derived by neglecting tension crack, while the others by considering it. Comparative results for applying different examples showed that the equation considering tension crack might be reasonable. 옹벽에 작용하는 토압을 구하기 위하여 Coulomb이론이 실무에 대부분 사용되고 있지만, 전수평토압의 작용위치를 구할 수 없으므로 토압분포를 삼각형 분포라고 가정하고 있다. 그러나, 수 많은 실내 및 현장실험을 통하여 토압분포가 그렇지 않다는 것으로 규명되었다. 이러한 문제를 극복하기 위한 이론적인 접근이 Handy(1985), Kingsley(1989), Kellogg(1993), 정성교(1993, 1996a) 등에 의하여 비 점성토로 뒤채움된 옹벽에 대하여 수행되었다. 점성토로 뒤채움된 옹벽에 대한 기존의 이론적 접근은 단지 Rankine또는 Coulomb 이론에 근거하여 주로 수행되었지만, 그 이론들은 제각기 다른 결과를 보여주었다. 여기서는 점성토로 뒤채움된 중력식옹벽에 작용하는 수평토압을 위한 이론적 접근이 비배수 조건하에서 수행되었다. 이 접근은 Coulomb의 가정에 바탕을 두고 아칭개념을도입하였으며, 인장균열을 무시한 경우와 고려한 경우에 대하여 각각 이론식이 유도되었다. 그리고, 몇가지 조건에 대한 비교결과에서 인장균열을 고려한 토압이론식의 적용이 합리적일 것으로 사료되었다.
Evaluation of the Undrained Shear Strength of Busan Clay
정성교,Yang-Pyo Hong,이정만,민세찬 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.5
The current paper presents an estimation of the undrained shear strength (su) of Busan clay through a comparison of the results of field vane and laboratory shear test results at two sites in the Nakdong River Delta. The results indicate that because of fabric effects in the clay, determining the effective overburden stress (σv0') and the field vane strength (su,FV) based on the corrected cone resistance (qt) is effective. The ratio su,FV/σv0' varied with the depositional units, independent of the plasticity index (Ip). In comparison to su,FV,combined shear strengths obtained from the consolidated-undrained compression and extension triaxial tests were slightly smaller and occasionally scattered because of the effects of sample disturbance. The laboratory shear strengths rely on the strain rate,regardless of the Ip. The correction factors using two different approaches were larger than those of the existing methods. For practical applications, the qt-based corrected vane strengths with the correction factor (μ) are thus recommended as the mobilized undrained shear strength of the clay (i.e., μsu,FV/ σv0' of 0.23), which is similar to the corrected value of the combined shear strengths for all depths.
명지지구 A블록 추가지반조사 및 기초설계 보고서(요약)
정성교,김성렬,류춘길 東亞大學校 建設技術硏究所 2007 硏究論文集 Vol.31 No.1
낙동강 하구 델타지역에서 아파트 단지를 건설하기 위하여 신호 및 명지지역에서 정밀지반조사와 현장말뚝재하실험을 통하여 건축물의 기초공법에 대한 검토가 다각도로 이루어졌다. 건축물의 기초는 안전을 최우선으로하며 경제적으로 설계하는데 목적을 두었다.
점성토(c-Ф 흙)로 뒤채움된 중력식 옹벽에서 인장규열을 고려한 수평토압 : 배수해석
정성교,남선우,김문규,오병수 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.2
Coulomb’s theory has been usually used in practice for design of retaining walls. This theory assumed that the lateral earth pressure was a triangular distribution, because the point of applying the thrust could not be abtained straightforward. However, the results of laboratory and filed tests proved that the lateral earth pressure was not a triangular distribution. In this study, for gravity walls with inclined backface, backfilled by c - ø soils with inclined surface, an analytical method for earth pressure has been derived. This method applied the flat arching concept and the Coulomb’s wedge, under drained condition, for the cases of considering tension crack. In addition, this paper is dealt with comparing the new analytical solution with existed theories for some cases.
정성교,전건욱 대한산업공학회 2008 산업공학 Vol.21 No.1
A new search procedure, VLT(Vertex Line Tracing) heuristic, for two dimensional irregular shapes nesting problem was suggested in this study. The VLT heuristic was suggested to the nesting problem to overcome disadvantages of the existing NFP(No-Fit-Polygon) method. This VLT heuristic was compared with the results of the existing benchmark problems suggested by Albano, Hopper, and Burke. The results of the VLT heuristic give efficient solutions in the point of the scrap ratio and computation time. A computer program, NestLogic, using C++ for VLT heuristic was also developed for this nesting problem.