Environmental Load Estimating Model of NATM Tunnel based on Standard Quantity of Major Works in the Early Design Phase

Lee, Ju-hyun; Kim, Kyong Ju; Kim, Eu Wang; Kim, Heung Rae

doi:10.1007/s12205-017-1795-z

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…In particular, research on sustainable technologies to reduce CO 2 emission among environmental loads is continuously being conducted [5][6][7][8][9]. The construction industry is recognized as a major cause of environmental pollution [10], and it is important to quantify and evaluate the environmental load.…”

Section: Introductionmentioning

confidence: 99%

“…Park et al studied correlation analysis between the environmental load computed through life cycle assessment (LCA) using the database of national highway construction cases and the inventory of available information that can be extracted in the road planning stage [13]. Lee et al developed and validated an environmental load estimating model for the New Austrian Tunneling Method (NATM) tunnel based on the standard quantity of major works in the early design phase [10]. These studies were conducted to develop decision-support tools using quantified environmental loads, or to evaluate environmental loads by applying life cycle cost (LCC) or environmental valuation methodologies.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Optimization Model for Estimating In-Situ Production Quantity of PC Members to Minimize Environmental Loads

Lim

Kim

2020

Sustainability

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CO2 emissions account for 80% of greenhouse gases, which lead to the largest contributions to climate change. As the problem of CO2 emission becomes more and more prominent, research on sustainable technologies to reduce CO2 emission among environmental loads is continuously being conducted. In-situ production of precast concrete members has advantages over in-plant production in reducing costs, securing equal or enhanced quality under equal conditions, and reducing CO2 emission. When applying in-situ production to real projects, it is vital to calculate the optimal quantity. This paper presents a dynamic optimization model for estimating in-situ production quantity of precast concrete members subjected to environmental loads. After defining various factors and deriving the objective function, an optimization model is developed using system dynamics. As a result of optimizing the quantity by applying it to the case project, it was confirmed that the optimal case can save 7557 t-CO2 in CO2 emissions and 6,966,000 USD in cost, which resulted in 14.58% and 10.53% for environmental loads and cost, respectively. The model developed here can be used to calculate the quantity of in-situ production quickly and easily in consideration of dynamically changing field conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Optimization Model for Estimating In-Situ Production Quantity of PC Members to Minimize Environmental Loads

Lim

Kim

2020

Sustainability

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Environmental Performance Analysis and Economic Perspectives of Concrete Girders

2019

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Carbon Footprint Evaluation in Tunnels Excavated in Rock Using Tunnel Boring Machine (TBM)

Rodríguez,

Bascompta,

García

2024

Int J Civ Eng

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The generation of CO2 is an important element in assessing the environmental impact generated in a tunnel construction project, making this knowledge very useful for evaluating different alternatives. In this study, an analysis of the carbon footprint has been carried out, including the main elements during the construction phase of a tunnel employing a tunnel boring machine (TBM). The research proposes several options for an easy and quick calculation of CO2 generation in a design phase. Its determination can be crucial for decision-making before and during the execution of any tunnel in the near future. The estimation models have been validated based on real case studies, defining the carbon footprint of each construction element. The proposed procedure can apply to any tunnel. However, it should be noted that it is an approximate analysis, and the limitations described in each section should be considered. The main CO2 generator found in the construction process is the lining element; the percentage varies between 50% in tunnels with smaller diameters (4–5 m) and 75% for tunnels with larger diameters (9–10 m), followed by the auxiliary elements, 16%, and the operation of the tunnel boring machine itself, 11.2%, while the other parts remain in a range between 1.3 and 5.7%. This knowledge makes it possible to define the aspects on which efforts should be focussed to reduce the carbon footprint of the tunnel construction process.

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Environmental Load Estimating Model of NATM Tunnel based on Standard Quantity of Major Works in the Early Design Phase

Cited by 11 publications

References 15 publications

Dynamic Optimization Model for Estimating In-Situ Production Quantity of PC Members to Minimize Environmental Loads

Dynamic Optimization Model for Estimating In-Situ Production Quantity of PC Members to Minimize Environmental Loads

Environmental Performance Analysis and Economic Perspectives of Concrete Girders

Carbon Footprint Evaluation in Tunnels Excavated in Rock Using Tunnel Boring Machine (TBM)

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