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다공질암의 동결융해 현상에 대한 이상물체 모델의 적용성 연구
한희수,백용,Han, Heui-Soo,Back, Yoog 한국터널지하공간학회 2010 한국터널지하공간학회논문집 Vol.12 No.5
동결융해과정이 지속적으로 반복되면서 발생되는 응력이력현상으로 인해 암반내의 피로현상이 누적되면서 암반내 누적 변위가 증가할 뿐 아니라 강도 역시 지속적으로 감소된다. 동결융해로 인한 응력의 hysteresis 현상은 대기온도의 영향에 의한 것으로, 일반적으로 점탄성 거동을 하게 된다. 그러므로, 이상물체를 이용한 암반해석을 위해, 일반적으로 점탄성 거동해석에 사용되는 Kelvin 모델을 적용할 수 있다. 또한 다공질암의 동결융해에 따른 열화 과정을 정량적으로 파악하기 위한 새로운 지표를 설정하고자 동결-융해 실험을 실시하였다. 본 연구에서는 다공성 응회암을 이용 동결-융해 실험을 실시 암석의 열화과정의 분석을 시도하였다. 실내실험 결과, 공극률의 변화를 정량화하여 열화특성을 설명하였다. 탄성계수 및 일축압축강도 등 암석의 물성변화를 공극률을 이용 열화 특성 함수로써 표현하였다. The accumulated displacements and fatigues of rock are increased by the stress-hysteresis, induced from repeated frost-thawing. Also the shear strength is decreased by them continuously. The stress-hysteresis is affected by the atmospheric temperature changes, whose behavior is visco-elasticity, usually. Therefore, to do ideal body analysis, Kelvin model could be used to analyze the frost-thawing behavior in winter. In general, rock slope failure occurs by the deterioration of rocks, which is caused by the repetition of freezing-thawing process. In order to keep the safety of such rock mass structures the deterioration process of rock needs to be described quantitatively using some meaningful parameters. In this work, the deterioration process in freezing-thawing cycle of tuff, which is a famous soft porous rock, is investigated through laboratory tests and successfully described as a differential equation for the change of porosity. And then, the deterioration of the mechanical properties of rock, such as Young's modulus and uniaxial compressive strength, are quantitatively described as a function of the porosity.
Safety Analysis of Plant Concrete Structure by Time Domain Reflectory
Heui-Soo Han(한희수),Yong-Gil Kim(김용길),Nam-Soo Kim(김남수) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Most civil structure performance assessment, e.g., damage, failure, and non-destructive inspection approaches, are difficult to execute on hard-to-reach elements of a structure. These routine methods are also time-consuming, with uncertainties involved and not cost-effective because of technologies limits. In civil engineering field, the monitoring of element of a long-type structure by Time Domain Refectory (TDR) or Fiber Optic Sensor (FOS) is aimed at early detecting of the safety of structure through the analysis of obtained deformation data at numerous points along the axis of the element. This study presents reasonable relationships to estimate the concrete safety and deformation based on TDR data to analyze concrete temperature variance. To measure the temperature variance in civil structure, TDR composed of two copper lines is installed in concrete specimen, From the laboratory test, TDR system could make the correct information about temperature variance of concrete curing. Therefore it is concluded, at first the mechanism of correct concrete curing could be acquired by TDR system, secondly from curing data, construction process in field could be controlled properly, it would be much more effective to apply at health monitoring system in civil structure compared to conventional sensor or FOS systems.
Safety Analysis of Plant Concrete Structure by Time Domain Reflectory
Heui-Soo Han(한희수),Yong-Gil Kim(김용길),Nam-Soo Kim(김남수) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Most civil structure performance assessment, e.g., damage, failure, and non-destructive inspection approaches, are difficult to execute on hard-to-reach elements of a structure. These routine methods are also time-consuming, with uncertainties involved and not cost-effective because of technologies limits. In civil engineering field, the monitoring of element of a long-type structure by Time Domain Refectory (TDR) or Fiber Optic Sensor (FOS) is aimed at early detecting of the safety of structure through the analysis of obtained deformation data at numerous points along the axis of the element. This study presents reasonable relationships to estimate the concrete safety and deformation based on TDR data to analyze concrete temperature variance. To measure the temperature variance in civil structure, TDR composed of two copper lines is installed in concrete specimen, From the laboratory test, TDR system could make the correct information about temperature variance of concrete curing. Therefore it is concluded, at first the mechanism of correct concrete curing could be acquired by TDR system, secondly from curing data, construction process in field could be controlled properly, it would be much more effective to apply at health monitoring system in civil structure compared to conventional sensor or FOS systems.