• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2003.08a
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• pp.315-322
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• 2003

최근 들어 시화호 주변에 연구개발 및 주거를 목적으로 하는 사업지구가 활발하게 계획 또는 시공되고 있는데, 모든 건설공사에서와 마찬가지로 안전하고 경제적인 설계 및 시공을 위해서는 실내 및 현장지반조사를 통하여 지반의 공학적 특성에 대한 정확한 평가가 반드시 선행되어야 한다. (중략)

• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.577-579
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• 2006

본 논문에서는 불연속면과 터널라이닝과의 교차부에 대한 효과적인 지반공학적 검토를 위하여 불연속면의 경사를 고려할 수 있는 3차원 수치해석을 수행하였다. 불연속면이 존재하는 경우, 콘크리트 라이닝에 발생하는 휨압축응력이 불연속면을 주변을 따라 불연속면이 없는 경우에 비해 상대적으로 크게 나타났으며 이는 불연속면의 존재로 인한 응력집중현상에 기인한다. 최대휨압축응력은 측압계수와 함께 증가하였으며, 불연속면을 고려하였을 경우 그 증가폭이 확대되었다.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03a
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• pp.199-210
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• 2004

제주도는 신생대 제 3기~4기에 형성된 화산섬으로서 수십 차례에 걸친 화산분출에 의해 형성되어 지리적으로 한반도의 최남단에 위치하고 있으며, 우리나라에서 가장 큰 섬이다. 섬 중앙의 한라산을 중심으로 쉴드 화산체를 이루고 있는 제주도는 동서의 길이가 약 74km, 남북의 길이가 약 34km되며 섬 전체 면적이 1,825$\textrm{km}^2$인 타원형의 모양을 하고 있다. 제주도의 중앙부에는 수 차례의 화산활동에 의해 형성된 약 1,950m 높이의 한라산 정상에는 지름이 약 575$\times$400m, 깊이가 100m에 이르는 분화구가 있으며, 돔상의 조면암이 분화구 주변에 관입 되어 있다.(중략)

• Proceedings of the Korean Geotechical Society Conference
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• 2002.10a
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• pp.85-95
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• 2002

A substantial portion of the cost of deep excavations in urban environments is devoted to prevent ground movements and their effects on adjacent buildings and utilites. Prediction of ground movements and assessment of the risk of damage to adjacent structures has become an essential part of the planning, design, and construction of a deep excavation project in the urban environments. This paper presents damage assessment techniques for buildings and utilities adjacent deep excavation, which can be readily used in practice.

• Journal of the Korean Geotechnical Society
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• v.17 no.4
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• pp.191-198
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• 2001

국내 도로포장의 주요 파손형태는 주변환경 및 반복 교통하중 조건에 의한 소성변형(rutting), 피로균열, 반사균열, 온도균열 등이 있는데, 포장이 설계수명에 도달하기 이전에 주로 발생하며 이로 인한 도로포장의 유지관리에 막대한 국가예산이 낭비되고 있는 실정이다. 본 연구에서는 토목섬유 아스팔트 포장 시스템을 체계적으로 정립하기 위해 휠트래킹 시험과 균열저항성 시험을 수행하여 토목섬유 아스팔트 포장의 소성변형 및 균열 저항성을 분석하였다. 이러한 실험결과를 통해 아스팔트 포장에서의 토목섬유 보강 효과가 평가되었다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.5 no.4
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• pp.301-312
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• 2003

This paper considers the stresses and pore pressures induced in soft ground due to tunnelling and it presents and discusses the approach methods for estimating the stability of the tunnel and its heading during drained and undrained condition. In practical, the undrained analyses of the face stability of shield tunnelling in soft soil, are carried out based on the field data measured during tunnelling and the results are also evaluated.

• Proceedings of the Korean Geotechical Society Conference
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• 2005.03a
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• pp.1476-1483
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• 2005

This paper presents the results of small scale model tests on the behavior of propped wall and ground movements during deep excavation. Small scale model tests were performed in order to investigate the effects of various influencing factors on the deep excavation, such as stiffness of ground and unsupported span length. The results of model tests indicated that the wall behavior is significantly influenced not only by the stiffness of ground but by the over-excavation, and that the wall behavior can be reduced by decreasing the unsupported span length and increasing the stiffness of ground.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 1996.03a
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• pp.11-24
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• 1996

최근 들어 지하공간 활용에 대한 필요성이 강하게 대두되면서 지하암반 굴착공사가 매우 활발하게 진행되고 있다. 오래 전부터 공사되었던 지하철 및 산악터널 뿐만 아니라 오늘날에는 지하암반의 특수성을 이용한 지하공간 사업 즉, 지하양수 발전소, 핵폐기물 저장소, 유류 비축기지 등이 건설 중에 있으며, 지하공간과 관련된 대형 프로젝트가 구상되고 있다. (중략)

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.4C
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• pp.163-174
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• 2009

Mechanical device using the load cell or strain gage sensor can be influenced by tempearute changes because temperature change can cause a shift in the load cell or straing gage output at zero loading. In this paper, micro cone penetrometers with 1~7mm in diameter, are developed by using an optical fiber sensor (FBG: Fiber Bragg Grating) to compensate the continous temperature change during cone penetration test. Note the temperature compensated method using optical fiber sensor which has hair-size in diameter, and is not affected by environmental conditions because the measured data is the wavelength shifting of the light instead of the intensity of the electric voltage. Temperature effect test shows that the output voltage of strain gage changes and increases with an increase in the temperature. A developed FBG cone penetrometer, however, achieves excellent temperature compensation during penetration, and produces continuous change of underground temperature. In addition, the temperature compensated FBG cone shows the excellent sensitivity and detects the interface of the layered soils with higher resolution. This study demonstrates that the fiber optic sensor renders the possibility of the ultra small size cone and the new fiber optic cone may produce more reliable temperature compensated tip resistance.

• Journal of Korean Tunnelling and Underground Space Association
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• v.19 no.6
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• pp.1045-1058
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• 2017

This paper is a study on railway tunnel behavior characteristic of shallow overburden under the existing road. In order to understand the behavior characteristics of the ground deformation during tunnel excavation, a horizontal rod extensometers were installed in the passage area of the shallow overburden tunnel under the road, and the measurement and analysis were carried out. To compare the in situ measurement, three dimensional numerical analysis with ground condition and construction step was carried out using MIDAS NX. As a result of the field measurement, large preceding settlement occurred where the poor ground condition with shallow overburden excavation has been conducted. As a result of the numerical analysis, the largest settlement occurred at the shallow overburden point where the ground condition was poor. Therefore, in the shallow overburden section where the soil condition is poor and a sufficient depth can't be secured and the arching effect of the ground around the tunnel can't be expected, careful attention should be paid to the application of stiffness reinforcement measures and to minimize ground loosening.