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List of products by author: D. Lee
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Application of Liquid Air Refrigerant to Artificial Ground Freezing in Enclosed Subsea Tunnels
Abstract: Subsea tunnels are highly vulnerable to seawater intrusion caused by high water pressure during construction. The artificial ground freezing (AGF) will be a promising alternative to conventional reinforcement methods. Use of brine as a refrigerant is disadvantageous because of its longer freezing time due to the high boiling point. On the other hand, liquid nitrogen, which can freeze saturated...
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Assessment of deterioration in underground structures using field inspection
Abstract: As soon as the infrastructure has been built, the deterioration started. The previous paper is focused on the influence of carbonation for the durability (Choo et al, 2014). This paper is the second part of the deterioration assessment related with the state of filed inspection: crack, leakage, effloresce, exfoliation, spalling, and so on. Based on the design approach of Duracrete, the...
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Effect of sample preparation and freezing temperature on constitutive modeling for frozen soil in subsea tunnel...
Abstract: When high water-pressure is expected during constructing cross passages in subsea bored tunnels, convectional grouting technologies are not appropriately adapted to water cut-off. In this extreme condition, the artificial ground freezing (AGF) technique can be a promising alternative for constructing cross passages through highly-fractured fault zones. An appropriate experiment procedure to...
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Numerical Modelling for Effective Thermal Conductivity of Frozen Soil for Designing Artificial Ground Freezing
Abstract: The artificial ground freezing technique can be a promising tool for constructing cross passages of a subsea tunnel through highly-fractured fault zones. To design the artificial ground freezing method, it is very important to estimate the thermal conductivity of unfrozen and frozen soils. Because the direct measurement of thermal conductivity of frozen soil is a complex and time-consuming task...
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Optimum Freezing Pipe Arrangement for Subsea tunnel Cross Passage Construction
Abstract: Nowadays, linking countries and continents in the global transportation systems becomes an utmost challenge of civil engineering, which attracts a growing interest in construction of subsea tunnels. Among many parts of a subsea tunnel, cross passages connecting parallel twin tunnels, play a role to equilibrate the air pressure generated by passage of high speed trains, and as an emergence...
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