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시화지구 연약점토의 광물학적 특성과 공학적 특성의 상관관계
김낙경,박종식,주용선,Kim Nak-Kyung,Park Jong-Sik,Joo Yong-Sun 한국지반공학회 2004 한국지반공학회논문집 Vol.20 No.9
국내 연약지반 활용을 위한 효율적이고 경제적인 안정처리 공법의 선정과 설계 및 시공을 위해서는 대상지반의 특성을 파악하는 것이 대단히 중요하다. 본 연구는 시화지구 연약점토의 물리적, 역학적 특성과 광물학적 특성을 파악하여 연약점토의 물리적, 역학적 특성과 광물학적 특성과의 상관관계를 알아보는 데 그 목적이 있다. 본 연구에서 는 연약점토의 광물학적 특성을 파악하기 위하여 X선 형광분석, X선 회절분석, 주사전자현미경분석과 에너지분산미분석 실험을 실시하였으며 시화지구 연약지반의 시추조사결과, 실내시험 및 현장시험결과와의 상관관계를 알아보았다. 또한 시화지구 연약점토의 특성을 양산과 군산 지역 연약점토의 특성과 비교하였다. The characteristics of soft clays are very important for the land development plan. This study is to investigate correlations between the engineering properties and the characteristics of clay minerals of the undisturbed clay samples obtained from Sihwa area. This study included X-Ray diffraction analysis, X-Ray fluorescence spectrometer analysis, scanning electron microscopy analysis and energy dispersive X-Ray spectrometer analysis. The correlations between the clay mineral properties and the laboratory and field testing results were investigated. The characteristics of soft clay in Sihwa area were compared with those in Yangsan and Kunsan area.
헬리컬 앵커의 관입토크와 극한인발력 상관관계 도출 시 극한인발력 평가법의 영향
김낙경(Nak-Kyung Kim),나종열(Jong-Yeol Na),김영욱(Young-Uk Kim) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
This study investigated corelation of installation torque and the ultimate uplift capacity of the helical anchor. The investigation involved a seriese of soil chamber tests. Two different methods for determining the ultimated uplift capacity of the anchors were used. The results of the study show that Davisson method illustrated clearer relationship between installation torque and the ultimate uplift capacity of the helical anchor than BS method.
김낙경 ( Kim Nak Kyung ),김성규 ( Kim Sung Kyu ),서효균 ( Seo Hyo Kyun ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
A laboratory model tests has been carried out to measure the ultimate load of vertically embedded cylindrical anchors in sand. For the model test, a dimensional analysis of a general anchors was performed. Details of the dimensional analysis of in-situ anchors were presented in this paper. Based on the results of the dimensional analysis, the model-scaled anchorage system was simulated. Anchor model tests were performed on two types of model anchors. One has been shaft and end plate, called composite anchors, the other has been only shaft. Due to the extended plate of the anchor shaft end, both the shaft friction and the end resistance have substantial contribution to the pullout capacity. The pullout load was applied to the bottom of the model anchor through a high strength steel rod of 4mm diameter. Each ultimate loads were measured and compared with the design load.
김낙경(Kim Nak-Kyung),박종식(Park Jong-Sik),김성규(Kim Sung-Kyu) 대한토목학회 2007 대한토목학회논문집 C Vol.27 No.1
본 논문에서는 FPF(Fibrillated Polypropylene Fiber)로 보강된 다져진 모래질 성토층의 평판재하 시험을 수행하여 FPF 보강토의 하중-침하 거동을 알아보았다. FPF 보강토에 대한 모형 평판재하 시험, 모형사면 시험, 현장 평판재하 시험을 수행하여 사질토에 대한 FPF 보강 효과를 연구하였다. 본 연구를 위해 사전에 수행된 FPF 보강토의 실내 시험 결과를 근거로 하여 사질토 세섬유 보강토에 대한 최적 배합비를 결정하고 이를 재하 시험에 적용하였다. 제안된 평판재하 시험에 따라 FPF 보강토의 하중-침하 거동은 변형이 늘어날수록 지속적으로 하중이 증가하는 하중 경화 현상을 나타냈다. 평판재하 시험 결과를 통하여 사질토에 대한 FPF 보강 효과를 확인할 수 있었다. 섬유 함유량 0.5%, 섬유 길이 5㎝로 보강된 세섬유 보강토의 모형 평판재하 시험 결과로부터 세섬유 보강토의 극한 하중이 무보강 조건에 비해 약 26% 증가함을 확인하였다. 동일한 섬유 보강 조건이 적용된 세섬유 보깅토의 현장 평판재하 시험 결과로부터 극한 하중이 약 21% 증가함을 확인하였다. 또한 모형사면 시험 결과는 세섬유의 보강 효과를 시사했으며 사면 경사 35岵OE 세섬유 보강사변에서는 약 47%, 경사 45岵OE 보강사면에서는 약 90%의 항복 하중 증가 효과를 보였다. This paper presents a load settlement behavior obtained from load tests executed on a thick homogeneous stratum of compacted sandy soils reinforced with Fibrillated Polypropylene Fibers (FPF). Model and field plate load tests and model slope tests for the artificial FPF-reinforced soil layers were performed to investigate the FPF reinforcement. Based on the previous laboratory tests for FPF-reinforced soils, these load tests were carried out under the best mixture condition of FPF. The results of the load tests showed that the FPF reinforcement increased the peak strength and conducted a load settlement hardening behavior at very large strains. The increase in ultimate load at axial strains as large as 10%, from the model plate load test could be as much as approximately 26% at a fiber content of 0.5% by weight of dry soil and at a fiber length of 5㎝. In the same mixture condition of reinforcement, the ultimate load obtained from the field plate load test was approximately 21 % larger than those of soil layers without FPF. The behavior of FPF-reinforced slopes with angles of 35° and 45° was observed compared to those of non-reinforced sandy slopes. The ultimate load increased approximately 47% for FPF-reinforced slope with angle of 35° and increased approximately 90% for FPF slope with angle of 45°.
김낙경(Kim Nak Kyung),김성규(Kim Sung Kyu),서효균(Seo Hyo kyun) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
A laboratory model tests has been carried out to measure the ultimate load of vertically embedded cylindrical anchors in sand. For the model test, a dimensional analysis of a general anchors was performed. Details of the dimensional analysis of in-situ anchors were presented in this paper. Based on the results of the dimensional analysis, the model-scaled anchorage system was simulated. Anchor model tests were performed on two types of model anchors. One has been shaft and end plate, called composite anchors, the other has been only shaft. Due to the extended plate of the anchor shaft end, both the shaft friction and the end resistance have substantial contribution to the pullout capacity. The pullout load was applied to the bottom of the model anchor through a high strength steel rod of 4mm diameter. Each ultimate loads were measured and compared with the design load.