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준설토를 활용한 도로 성토 기술개발을 위한 지오텍스타일 튜브의 국내외 시공현황 분석
성현종(Hyun-Jong Sung),김형주(Hyeong-Joo Kim),고정희(Jeong-Hee Ko) 한국지반신소재학회 2013 한국지반신소재학회 학술발표회 Vol.2013 No.4
This Embankment technology using Geotextile tube presented in this study was first introduced in Korea Ilsan Bridge Project by TENCATE’s technology. As the transportation distance from the quarry location to the construction site of the coastal area roads and embankments is far, the cost of transporting these fill materials is expensive and engineers had encountered construction difficulties, hence, conventional embankment technology must be furthered researched. In this study, we can obtain the basic data for the development of road embankment technology with geotextile tube utilizing dredged soil based on the geotextile tube construction cases being applied practical alternative to the conventional embankment technology, domestically and internationally.
조성경(Sung-Kyeong Jo),성현종(Hyun-Jong Sung),이광형(Kwang-Hyung Lee),김형주(Hyeong-Joo Kim) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
In this study, the optimal shape of a custom-made polypropylene (PP) woven geotextile tube filled with landfill dredged sedment was investigated. An observation on the deformation behavior of the geotextile tube during filling and after dewatering was thoroughly conducted. A T-shaped inlet (patend application number: 10-2013-0090597) developed for this specific experiment was used to deliver the pumped dredged soil to fill the geotextile tube until tube height is equivalent to 50% it’s theoretical diameter. the changes in the gedtextile width and height measurement during and after slurry filling were constantly monitored and recorded. Measurements were conducted using special measuring staff on the outer shell of the geotextile tube. the effective tube height reduction at each measurement point on the geotextile tube ranges from 3,2% to 32% two days after the final slurry injection. In addition, geotextile strain varies depending on the amount of accumulated soil in the cross-section. Maximum strain occurs at the branch point with maximum cross-sectional area, however, the top and bottom geotextile sections shows minimal strain reading.
준설토 채움에 따른 토목섬유 튜브 단면의 형상변화에 관한 연구
조성경(Sung-Kyeong Jo),성현종(Hyun-Jong Sung),김용범(Yong-Beom Kim),김형주(Hyeong-Joo Kim) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.4
According to previous studies riprap protected geotextile tube retaining structures are an excellent alternative for concrete structures because of its cost-effective and environmentally friendly construction methods. In this study, the effects of the changing volume of the dredged fill materials to the shape of the tube after the injection process is analysed. The geotextile tube used in the experiment has a diameter (D) of 0.7m and length (L) of 4.0m. The slurry used is prepared by mixing water and dredged soil on a mixing tank. The water content of the slurry is about 600% during injection. Results of this study can be used as the basis for the optimal shape design of polypropylene (pp) woven geotextile tubes.
수치해석을 통한 앵커의 긴장력과 사면 안전율의 상관관계 도출
김영상,이철주,성현종,Kim. Young Sang,Lee. Cheol-Ju,Sung. Hyun-Jong 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
최근 기후변화로 발생하는 이상강우에 의한 지하수위의 상승은 사면보강을 위해 설치한 앵커의 초기 긴장력의 증가를 유발시킬 수 있다. 한편 사면의 국부적 파괴나 낙석 등으로 인한 앵커 두부(head)의 예기치 못한 손상은 긴장력 상실로 이어져 앵커로 보강된 사면의 안정성을 저하시키는 주된 요인이 될 수 있다. 이와 같은 앵커 긴장력의 변화는 사면의 안정성에 매우 직접적으로 영향을 미치지만 현재의 기술은 앵커 긴장력의 존재 유무만을 간단히 확인하거나 단기간의 긴장력 변화를 측정할 수 있는 기술만이 있을 뿐 영구사면과 같이 장기간 앵커의 긴장력 변화와 사면의 안정성에 대한 직접적이고 효과적인 모니터링 방법은 찾아보기 어렵다. 본 연구에서는 장기간의 앵커 긴장력 모니터링이 가능하도록 개발된 광섬유 센서 내장형 텐던을 이용하여 사면의 안정성을 직접 평가할 수 있도록 초기 긴장력 감소 및 증가와 사면 안전율의 상관관계에 대하여 수치해석적 검토를 수행하였다. 앵커가 시공되어 있는 실제 사면의 사례에 대한 한계평형해석 및 3차원 유한요소해석을 실시하여 사면에 설치된 앵커의 긴장력 변화와 사면 안전율(factor of safety) 변화에 대한 검토를 수행한 결과, 지하수위 상승으로 인한 앵커 긴장력의 증가는 사면 안전율의 비선형적 감소를 동반하며 일정 수준 이하의 앵커 긴장력 감소는 선형적 사면 안전율 감소를 동반하는 것으로 나타났다. Main reasons making the slope reinforced with anchors unsafe are rise of ground water table due to heavy rainfall and sudden reduction of initial tensile force due to damage of anchor head. In this research, numerical analysis was carried out to evaluate the safety of slope reinforced by anchors from the monitoring result of tensile force. Limit equilibrium analysis and 3D finite element analysis were carried out to model the sudden reduction of initial tensile force and increase of tensile force due to soil movement, which was caused by rise of ground water table. From the numerical analysis, it was found that the increase of tensile force due to rise of ground water table comes with nonlinear decrease of safety factor and reduction of initial tensile force due to damage of anchor head accompanied with linear decrease of safety factor. From the results, it can be concluded that safety of the slope can be evaluated indirectly by monitoring the tensile force of anchor using FBG sensor embedded tendon.
준설 토목섬유 튜브의 배수상태에 따른 지지력 변화에 관한 연구
이장백(Jang-Baek Lee),성현종(Hyun-Jong Sung),이광형(Kwang-Hyung Lee),김형주(Hyeong-Joo Kim) 한국지반신소재학회 2014 한국지반신소재학회 학술발표회 Vol.2014 No.4
In this study a cone penetration test on a dredged soil filled geosynthetic tube was performed after the tube attained its final height. The cone penetration was carried at different point locations along the length of the geosynthetic tube under submerged and dry conditions. It was found that the bearing capacity of the soil inside the tube is low when the geotextile tube is submerged in water. The bearing capacity of the tube structure is increased when water is drained.
준설 토목섬유 튜브를 활용한 제방 축조 공법 결정을 위한 영향 인자에 관한 연구
김형주(Kim Hyung-Ju),성현종(Sung, Hyun-Jong) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.10
본 논문에서는 국내외 준설 토목섬유 튜브 공법의 시공사례에 근거한 적용성과 경제성을 분석하여 공법 결 정에 미치는 영향인자에 대하여 연구하였다. 국내사례에서는 준설 토목섬유 튜브를 적용함으로써 40∼50% 정도의 공 사비 절감 효과가 발생하고 국외사례의 경우는 사석 제방단면의 코어 부분을 준설 토목섬유 튜브로 대체함으로써 사 석 물량을 20∼70%이상 절감한 것으로 보고되고 있다. 연구결과 준설 토목섬유 튜브를 활용하여 제방 축조 시 구조 물의 시공규모가 클수록 경제성이 크고, 사석 운반거리는 16∼25km이상인 경우에 공사비 절감효과가 있는 것으로 나 타났다. 따라서 준설 토목섬유 튜브를 활용한 제방 축조 공법 결정 시 시공규모 및 사석 운반거리는 중요한 영향인자 임을 확인하였다. In this paper, the influencing factors for the decision of the embankment construction method utilizing geotextile tube were studied by analyzing the application and economic considerations based on the construction practices of the geotextile tube filled with dredged soil in the domestic and international. In the domestic case, cost savings of 40 to 50% is attained by applying geotextile tubes in the embankment construction and in the international case, the amount of quarry materials was reduced from 20 to 70% by replacing the core of the embankment with geotextile tube. As a result, utilization of geotextile tube filled with dredged soil should be considered in a very large construction site with a quarry-to-site delivery distance of more than 16∼25km. The construction scale and delivery distance were found to be important influencing factors for the decision of the embankment construction method utilizing geotextile tube filled with dredged soil.