• 제목/요약/키워드: geoenvironmental engineering

검색결과 109건 처리시간 0.029초

불법매립폐기물에서 선별된 토사의 지반환경공학적 특성 분석 (Geoenvironmental Characteristics of Sorted Soil From Unregulated Landfill Wastes)

  • 정하익;김상근;류권;이용수
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2001년도 봄 학술발표회 논문집
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    • pp.605-610
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    • 2001
  • There has been a steady increase in geoenvironmental engineering projects where geotechnical engineering has been combined with environmental concerns. Many of these projects involve some investigation on geoenvironmental characteristics related to waste landfill and waste soil. This study was carried out to evaluate the geoenvironmental properties of sorted soil from unregulated landfill wastes. The physical, mechanical, and environmental Properties of sorted soil were investigated for utilization in civil works.

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비위생매립지 지반환경 정밀조사

  • 김상근;정하익
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2003년도 추계학술발표회
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    • pp.471-474
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    • 2003
  • There has been a steady increase in geoenvironmental engineering projects where geotechnical engineering has been combined with environmental concerns. This study investigate on contaminant around unsanitary landfill situated in urban area and was carried out to evaluate the geoenvironmental characteristics of this site. As a result of this study, groundwater and soil around this landfill site was evaluated for analysis of physical and chemical properties.

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A predicting model for thermal conductivity of high permeability-high strength concrete materials

  • Tan, Yi-Zhong;Liu, Yuan-Xue;Wang, Pei-Yong;Zhang, Yu
    • Geomechanics and Engineering
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    • 제10권1호
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    • pp.49-57
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    • 2016
  • The high permeability-high strength concrete belongs to the typical of porous materials. It is mainly used in underground engineering for cold area, it can act the role of heat preservation, also to be the bailing and buffer layer. In order to establish a suitable model to predict the thermal conductivity and directly applied for engineering, according to the structure characteristics, the thermal conductivity predicting model was built by resistance network model of parallel three-phase medium. For the selected geometric and physical cell model, the thermal conductivity forecast model can be set up with aggregate particle size and mixture ratio directly. Comparing with the experimental data and classic model, the prediction model could reflect the mixture ratio intuitively. When the experimental and calculating data are contrasted, the value of experiment is slightly higher than predicting, and the average relative error is about 6.6%. If the material can be used in underground engineering instead by the commonly insulation material, it can achieve the basic requirements to be the heat insulation material as well.

Nonexistence and non-decoupling of the dissipative potential for geo-materials

  • Liu, Yuanxue;Zhang, Yu;Wu, Runze;Zhou, Jiawu;Zheng, Yingren
    • Geomechanics and Engineering
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    • 제9권4호
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    • pp.531-545
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    • 2015
  • Two fundamental issues exist in the damage theory of geo-material based on the concept of thermodynamics: existence or nonexistence of the dissipation potential, and whether the dissipation potential could be decoupled into a damage potential and a plastic one or not. Thermodynamics theory of elastoplastic damage assumes the existence of dissipation potential, but the presence of dissipation potential is conditional. Based on the dissipation inequality in accord with the second law of thermodynamics, the sufficient and necessary conditions are given for the existence of the dissipation potential separately in total and incremental forms firstly, and proved strictly in theory. With taking advantage of the basic mechanical properties of geo-materials, the nonexistence of the dissipative potential is verified. The sufficient and necessary conditions are also given and proved for the decoupling of the dissipation potential of geo-materials in total and incremental forms. Similarly, the non-decoupling of the dissipation potential has also been proved, which indicates the dissipation potential of geo-materials in total or incremental forms could not be decoupled into a dissipative potential for plasticity and that for damage respectively. The research results for the fundamental issues in the thermodynamics theory of damage will help establish and improve the theoretic basis of elastoplastic damage constitutive model for geo-materials.