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Title |
An Estimation of the Temperature-dependent Thermal Conductivity for Hybrid-fiber Reinforced Shield Tunnel Lining
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Keywords |
하이브리드 섬유보강 쉴드터널 라이닝 ; 열전도 역문제 ; 온도의존적 열전도도 ; Hybrid-fiber reinforced shield tunnel lining ; Inverse heat conduction problem ; Temperature-dependent thermal conductivity |
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Abstract |
This study presents estimation method of temperature-dependent thermal conductivity by using solution of inverse heat conduction problem. Time and depth temperature distribution data from full-scale fire test were used for estimating temperature-dependent thermal conductivity on hybrid-fiber reinforced shield tunnel lining. At short heating time, estimated thermal conductivity sharply decreased within 100℃. On the other hand, it reflected thermal properties of concrete and effect of steel fiber at heating time of measured maximum heating temperature. Thus arbitrary time should be determined to estimate temperature-dependent thermal conductivity in time zone of measured maximum heating temperature. Estimated temperature-dependent thermal conductivity is similar to results of other study.
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