• Title/Summary/Keyword: 지반정수 산정

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Comparison of CPTU and DMT Results on Inchon International Airport Marine Soils (인천국제공항 부지 해성 세립토에 대한 CPTU와 DMT 결과 비교)

  • 김주형;김영웅;조성민;김명모
    • Journal of the Korean Geotechnical Society
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    • v.16 no.6
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    • pp.23-33
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    • 2000
  • 인천국제 공항에 분포하는 해성세립토 지반에서 일련의 CPTU와 DMT를 실시하고 그결과로부터 구한 비배수전단강도($s_{u}$ ), 과입밀도(OCR), 압밀계수($c_{h}$) 등과 같은 지반 정수와 기존의 시험자료 등을 분석하여 두 시험 결과를 비교하였다. 이 분석에의하면, CPTU와 DMT 두시험은 모두 피에조콘 정수, $B_{q}$ )로 분류하여 점성토인 지반에서 보다 신뢰성이 높은결과를 주었으며, 또한 해석방법에 따라 지반정수 산정결과에 큰 편차를 보여, 적절한 해석방법의 선택이 신뢰성있는 지반정수의 산정을 위한 주요한 인자임을 알았다. 그리고, 소성적 성질이 낮은 세립토 지반에서의 CPTU와 DMT를 이용한 비배수전단 강도 또한 과압밀비의 산정은 상당한 오차를 유발할 수 있다고 판단되었다.

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Coupling Analysis and Back Analysis for Soil Stress - Deformation - and Seepage - Deformation Analysis by Back Analysis Method (지반응력변형과 지하수침투 해석에 대한 연성해석 및 역해석 -역해석기법을 이용한 지반변형 해석-)

  • 권호진;변광욱
    • Geotechnical Engineering
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    • v.9 no.1
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    • pp.21-30
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    • 1993
  • To know the importance of soil paramters which are used to estimate the deformation and porepressure of soil, the sensitivity for soil parameters in elastic analysis is analyzed. Using the consolidation teat results of several cohesive soils, soil parameters are estimated by back analysis method, and from the parameters the deformations and porepressures of the soil are estimated by elastic analysis, In elastic analysis for soil-deformation and porepressure, the sensitivity for the Young's modulus is large, and the esimation of Young's modulus is more important in pro- portion to the size of stress. Using the measured results during initial short period in small stress, the soil parameters can be correctly estimated by back analysis method. To decrease the iteration number in back analysis and to get the better paramters, the initial measurements in more nodes are required and the more accurate initial measurements are required.

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Probabilistic Distribution and Variability of Geotechnical Properties with Randomness Characteristic (무작위성을 보이는 지반정수의 확률분포 및 변동성)

  • Kim, Dong-Hee;Lee, Ju-Hyoung;Lee, Woo-Jin
    • Journal of the Korean Geotechnical Society
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    • v.25 no.11
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    • pp.87-103
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    • 2009
  • To determine the reliable probabilistic distribution model of geotechnical properties, outlier and randomness test for analysis data, parameter estimation of probabilistic distribution model, and goodness-of-fit test for model parameter and probabilistic distribution model have to be performed in sequence. In this paper, the probabilistic distribution model's geotechnical properties of Songdo area in Incheon are estimated by the above proposed procedure. Also, the coefficient of variation (COV) representing the variability of geotechnical properties is determined for several geotechnical properties. Reliable probabilistic distribution model and COV of geotechnical properties can be used for probability-based design procedure and reasonable choice of design value in deterministic design method.

Empirical Estimations of Soil Constants Using Standard Penetration Test N Value (표준관입시험 N값을 활용한 지반정수의 경험적 산정)

  • Gang, ByeungJu;Hwang, Bumsik;Cho, Wanjei
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.6
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    • pp.5-12
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    • 2018
  • Domestic design manuals provide various empirical relationships of design parameters of soils with N values from the Standard Penetration Test (SPT), which can be widely used in the basic design process as well as during the construction process. However, the currently used empirical relationships are based on the data from foreign countries and are rarely evaluated with domestic data with currently used site investigation techniques. Therefore, in this study, those empirical relationships and conversion tables are evaluated with the geotechnical information in the Integrated DB Center of National Geotechnical Information and new empirical relationships are newly proposed with the consideration of domestic geotechnical conditions.

Evaluation of Support Requirements for the Single Shell Tunnels from the Case Study of Rock Mass Classifications (국내 암반분류 사례를 통한 싱글쉘 터널 지보량 산정 연구)

  • Kim Hak-Joon;Lee Seong-Ho;Shin Hyu-Seong;Bae Gyu-Jin
    • The Journal of Engineering Geology
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    • v.16 no.3 s.49
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    • pp.283-291
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    • 2006
  • Shotcrete is used as a permanent lining in single shell tunnels even though shotcrete has been used as a temporary lining in NATM tunnels. Therefore, the accurate evaluation of strength parameters is very crucial because the reliable estimation of loads acting on the shotcretes is necessary to maintain the stability of tunnels. The evaluation of strength parameters of the ground far the single shell tunnels should be investigated to adapt the method in Korea because the geological condition of Korea is different from that of other country. Rock classification and strength parameters obtained from 25 tunnel sites were investigated for this study. Support types fur the different rock classes are suggested for the single shell tunnels in Korea based on the NMT because Q-system has been widely used in Korea. The support types in terms of both Q and RMR values are given based on the correlation of Q and RMR values obtained from the case studies.

A Comparison of Soil Characteristics of Excavated Soils in Urban Area (도심지 굴착지반의 지반특성 비교)

  • Kim, Byungchan;Lee, JineHaeng
    • Journal of Korean Society of Disaster and Security
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    • v.10 no.1
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    • pp.35-42
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    • 2017
  • This is a comparative study on the characteristics of excavated soils, which is proceeded using soil strength parameter by literature, geotechnical investigation, standard penetration test by drilling, and downhole test by borehole at six sites in urban areas. The results of these site surveys are used as basic data for the evaluation and development of prediction of ground subsidence risk. Geotechnical properties are estimated with the result of standard penetration test-N value and literature. The dynamic geotechnical characteristics are also estimated with top-down seismic exploration at borehole.