• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.765-776
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• 2005

As a result of industrial advancement and land development, a number of highway slopes have been gradually formed and numerous problems related to their stability have been frequently caused. Generally, major factors for rock slope stability are lithology, slope inclination, slope height, degree of weathering, precipitation, condition of groundwater and so onl. Many complex factors are mostly involved in the collapse of rock slopes. In this study, a database for 94 collapsed Jungang highway slopes were set up using GIS program through literature search, site investigation, geological map and Korea tectonic province map. The analyses for the collapsed factor including sort of rock(by origin), tectonic province, highway direction, slope gradient and direction, degree of weathering, slope height were carried.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.1351-1360
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• 2005

New construction for public transport in congested urban areas will involve tunnel construction adjacent to existing building or bridge foundations and services due to the lack of surface space. Therefore, careful assessment of the important underground structure-soil-tunnelling interaction is relatively new, currently only limited information is available. In this study, the authors carried out FE analysis and the laboratory model test using the photogrammetric technique and suggested the influence zones associated with the normalised pile tip settlement during new tunnel construction.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.614-625
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• 2008

The project of Construction of Siem Reap bypass road in Cambodia consists of alignment improvement of existing route, extension of width of road and laterite paving. This project is carried out by fast-track method on the design and construction for bypass road of 15.2 km length and 8m width for five months. Though some difficulties for the construction works such as the location of borrow pit and rock source, rainy seasons etc, the construction could be completed successfully owing to the cooperation of related authorities, company and residents. This 2 way Angkor detouring road will function as industrial roads in Siemreap region. These new two roads will not only bring better logistics requirements and safety, but also impact to poverty alleviation and preservation the beauty of the ecological environment of Angkor region. The basic information related to geotechnical engineering of this project is introduced.

• 지구물리
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• 제8권1호
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• pp.23-33
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• 2005

The digital surface model (DSM) is used for several purposes in photogrammetry, remote sensing and laser scanned data such as orthoimage production, contours erivation, extraction of height information. Creation of a surface model from point-clouds (3-D sparse points) that can be derived from stereo imagery and range data (e.g. laser scanned data) can be done with several mathematical interpolation models. In this paper, thin-plate-spline (TPS) is used for digital surface modeling. Determination of suitable weight is an important problem in thin-plate function for a surface. The Voronoi algorithm has been proposed as a method for determination of the weight in thin-plate-spline. In this paper, methods has been tested for different surfaces. The results show that thin-plate-spline can be independent of weight.

• 한국지반공학회논문집
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• 제18권2호
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• pp.107-121
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• 2002

본 연구의 주된 목적은 지리정보체계(GIS, Geographic Information System) 기법을 활용하여 대규모매립지반의 장기적인 침하관리를 보다 효율적으로 수행할 수 있는 새로운 접근방법을 제시함에 있으며, 또한 제시된 GIS 기법 등을 활용하여 선행재하공법이 적용된 인턴국제공항 부지 전체연약층의 향후 예상침하량을 추정하여 보았다. 이 과정에서 공사 중 및 현재까지 측정된 다양한 침하량 계측자료가 분석되었으며, 아울러 Nagaraj 등의 이론을 토대로 한 재압축 지수의 산정과 Mesri & Godlewski가 제시한 과압밀상태에서의 2차압밀계수재압축지수 사이의 비를 정의하는 관계식 등을 토대로 2차압밀계수의 결정이 이루어 졌다.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.176-183
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• 2003

This paper presents a neural network based approach to disseminating information relating to experimental and field observations in engineering. Although the methodology is generic and can be applied to many areas of engineering science, attention is focussed here solely on geotechnical engineering applications. Field data relating to the settlement of foundations presented by Burland and Burbidge (1985) which led to their well known equation for calculation of settlement, now included in most text books, is re-visited. A part of the data, chosen randomly, is used to train an Artificial Neural Network (ANN), which relates foundation settlement to various causes as identified by the authors. Predictions are made for situations for which data were not used in training. These indicate sufficient accuracy when compared to the original field data. Accuracy of predictions is further improved when all the data are included in the training set. The finally trained ANN is shown to represent these data more accurately than the Burland and Burbidge equation. Based on the above heuristic example, an ANN is presented as an alternative to developing equations and design rules in geotechnical engineering practice. Significant advantages are shown to arise by using this methodology. Ease of updating the ANN, as and when additional data becomes available, being the most important one. Loss of transparency, however, seems to be the main disadvantage.

• 한국지반공학회지:지반
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• 제8권2호
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• pp.21-30
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• 1992

말뚝의 주면마찰력은 전체 지지력중 상당한 하중을 지지할 수 있으나 실제 설계시에는 무시되는 경우가 많이 있다. 주면마찰력을 설계에 반영할 경우에도 계산결과의 신뢰도는 매우 낮은 것이 현실이다. 국내의 사정은, 설계 자료로 활용할 수 있는 것은 표준관입시험 결과뿐인 경우가 대부분으로 빈곤하며 특히 국내에 많은 화강암, 편마암의 풍화잔류토에 관해서는 설계자료가 극히 희박해 외국에 비해 열악하다. 최근에 국내에서 개발된 간편한 말뚝재하시험(simple pile loading test: SPLT)의 사용은 선단지지력과 주면마찰력의 별도 측정이 가능하도록 하였다. 본 연구에서는 풍화잔류토 지반에서의 SPLT 결과를 분석하여 N값에 의한 새로운 설계관계식을 제안하였다.

• 한국지반공학회논문집
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• 제27권7호
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• pp.59-68
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• 2011

지반조사 결과 자료는 지반의 불균질성과 낮은 신뢰성을 갖는 일부 자료로 인해 불확실성을 갖게 된다. 이에 따라 지반조사 결과 자료를 활용하여 지반 특성을 해석할 경우 합리적인 공학적 판단을 위해 적절한 통계분석이 요구된다. 본 연구에서는 이상치 분석기법과 교차검증기법을 접목한 통계적 지반 공간 정보 분석 기법을 이용하여 대상지역 지반조사 자료 중 경향성을 상회하는 지반조사 지점을 선별하는 전문가시스템을 개발하였다. 개발 시스템을 이용하여 서울시 여의도 지역의 시추조사 자료를 바탕으로 지층구조 분석을 수행하였다. 그 결과 신뢰도가 낮은 것으로 판단되는 시추조사 자료를 결정하고, 본 지점을 제외한 여의도 지역의 기반암 섬도 분포를 확인하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1997년도 가을 학술발표회 논문집
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• pp.253-260
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• 1997

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.306-313
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• 2005

For seismic response analysis of rockfill dam, dynamic material properties, by field test, are needed. Density and elastic wave profiles have to be known to get an information of the material properties of structure. In this study, various field tests are applied to the example of rockfill dam to get an information of dynamic material properties and seismic safety is evaluated by seismic response analysis with the result of field tests.