• 한국지반공학회논문집
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• 제24권4호
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• pp.57-66
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• 2008

본 연구에서는 쪼갬 인장시험과 Fang, H. Y. and Fernandez(1981)에 의해 고안된 일축관입시험을 통한 동결토의 인장강도를 살펴보았다. 본 연구는 영하 15도의 환경 속에서 화강풍화토, 표준사와 카오리가 혼합된 사질 혼합토의 일축관입인장강도와 쪼갬 인장강도가 어떻게 변화하는지를 고찰하였다. 동결공시체는 함수비, 점토함량에 따라 다양하게 실험을 실시하였으며, 함수비와 점토함유량에 따라 일축관입인장강도와 쪼갬 인장강도간의 상호관계를 분석하였다. 결과를 요약하면, 평균적으로 쪼갬 인장강도는 일축관입인장강도에 비해서 4배정도 큰 강도를 나타내었다. 함수비가 증가함에 따라 두 인장강도간의 차이가 크게 나타났으며, 그리고 점토함량이 증가할수록 두 인장강도는 모두 감소하는 경향을 나타내었다.

• 대한토목학회논문집
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• 제28권6A호
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• pp.873-880
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• 2008

구조물의 열화 또는 손상상태 점검 시 정기적인 외관조사는 매우 중요한 역할을 담당한다. 이때 실시되는 외관조사는 주로 조사자의 스케치나 일반 카메라를 이용한 사진촬영에 의해 이루어지고 있다. 이럴 경우, 조사에 많은 노력과 시간이 소요된다. 따라서 본 연구에서는 보다 효율적이고 효과적인 조사를 위하여, 터널 외관상의 결함을 자동인식 할 수 있는 시스템을 개발하고자 한다. 이 과정에서 결함 손상인식을 위한 화상처리기술과 데이터 관리 및 분석 시스템이 중점적으로 개발 응용되었다. 이를 통해 콘크리트의 균열, 누수, 백화, 박리, 박락, 손상 등의 결함을 인식하여 데이터를 획득하고, 지속적이고 체계적인 데이터 관리시스템을 구축하여, 터널의 안전성 확보, 기능성 유지, 수명연장 등의 효과를 얻고자 한다.

• 한국건축시공학회지
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• 제3권1호
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• pp.131-138
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• 2003

Contemporary architecture calls for a wide range of surface textures and treatments. A surface compatible with the architect's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. The purpose of study is development of new design form and made elaborateness shape. Architecture finish material not used expenses working hours, personnel expenses, architecture finish material cost. After this, building wall apply a variety shape in concrete surface and Easy to used in field.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 봄 학술발표회 논문집
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• pp.309-314
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• 2003

Impact Echo method has been successful in detecting a variety of defects in concrete structure. This study has the objectives to show important aspects of applying the Discrete Wavelet Transform(DWT) to signal processing of Modified Impact Echo(ModIE) Measurement systems and to the understanding of the seismic wave propagation. The data of ModIE were processed by DWT and compared with the results of conventional ModIE Analysis. Although it is inconsistent in the evaluated thickness of concrete lining, the DWT provides the features of separation, synthesis and de-noising in the original signal. The application of technique by wavelet was explained numerically with ABAQUS and performed experimentally with a real scale model in this work. Further works on the possible ways for creating new mother wavelet are specially needed for the enhancement of seismic signal analysis.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.727-732
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• 2002

Steel Fiber Reinforced Shotcrete(SFRS) has been prevalently used in lining to stabilize tunnel structures as temporary or permanent support. In recent, it is one of the major elements of tunnel construction, and so the quality control of SFRC should be clarified to guarantee the safety. The experimental study has been performed to verify the possible correlations in several chracteristics related to quality of SFRC and examine the applicability of round panel test for in field. The test variables were the type and dosage of accelerator, aspect ratio of fiber, and fiber content. The test results such as compressive strength, flexural strength, flexural toughness, and energy absorption capacity, were exmained and analyzed scrutinizingly.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.746-751
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• 2006

The geumjunggu of the onchunchun which is the upper stream have been maintained as a too much picture to become a concrete lining about existing low flow channel and the reservoir water protecting banks for the reason of the flow of an upper stream steep slope and back of the shortage of the channel area in a suitableness interval. This research made a rating-curve to decide since to ensure against risks to the flood control through the undo of the rivers. And we found the speed of current of a nature undo interval and existing concrete interval and water level change out. A result from this natural disposition we must apply as a data for the research about the plan to be established in the rivers maintenance basis plan of onchunchun.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.711-715
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• 2003

For Taejon LNG Pilot Cavern being constructed to verify the technical aspects for storing LNG in lined rock cavern, efficiency tests of groundwater drainage system composed of many pumps and boreholes were performed around the cavern before and after the construction of concrete lining. Through evaluation of water balance and monitoring of pressures and flowrates, even if the present drainage system is very good for reducing water entries into the cavern, non-negligible water is still flowing in the floor of the cavern concrete due to heavy rainfall. To improve the drainage efficiency, additional drainage holes and some grouting were planned.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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• pp.526-531
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• 1996

Most of existing tunnels in Korea have structural and material defects, such as lack of the thickness in the crown and presence of an opening behind thie lining as a result of its construction. In Japan, it is said that carbon fiver sheet is very attractive for the upgrading damaged tunnel due to its good tensile strength, handability and resistance to corrosion. This report is the summary of the applicability of continous carbon fiber sheet for a repair and reiforcement of existing tummel located in Masan. It is the aim of this study to analyze the site data related to consturcion method used carbon fiber sheet.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.317-320
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• 2004

The setting time is very important factor affecting the quality of tunnel lining and reinforcement of sloped slope etc. Currently, however, the quality criteria of accelerating admixture to improve it is not established well. In this study, evaluation on setting time measuring methods of a cement accelerating admixture was performed. Six types of measuring methods were checked and a proper measuring method of the admixture were proposed as fellows: (1) the temperature of materials used shall be controlled exactly and (2) to evaluate the properties of it, an admixture usage of $5\%$ (ratio of cement weight) is recommended.

• 한국구조물진단유지관리공학회 논문집
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• 제10권4호
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• pp.160-166
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• 2006

본 연구에서는 광섬유 FBG 센서를 이용, 곡률반경을 고려한 이 방향 변위(Two-Way Displacement)를 측정하여 변형각을 환산함으로써 상대좌표를 구하는 알고리즘을 정립하였으며 이를 이용하면 작은 변형에 대해서도 매우정확하게 상대변위를 구할 수 있음을 알 수 있었다. 이를 확인하기 위해 4.5m높이의 H형강에 고안된 이 방향 광섬유센서를 부착하여 횡 방향으로 외력을 가해서 발생한 변위를 수준측량과 일반적인 전자식 변위계로 동시에 측정하여 각각의 측정성능을 비교분석하였다. 그 결과, 광섬유센서의 분해능은 다른 센서시스템에 비해 월등하였으며 이차원 상대좌표의 측정이 가능함을 확인하였다.