http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
지반조건에 따른 친환경 바이오그라우팅 주입 효과에 관한 연구
김대현(Kim, Daehyeon),박경호(Park, Kyung-Ho),김민석(Kim, Min-Sug),김선학(Kim, Sun-Hak) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.6
본 연구에서는 미생물 반응으로 생성된 탄산칼슘을 현장에서 활용되고 있는 주입장비와 유사하게 제작하여 모래지반 에 주입함으로 지반조건에 따른 주입범위 및 주입효과를 확인하고자 하였다. 본 연구를 위해 2종류의 단층토(SP, SW)를 D 150mm X H 300mm의 모형토조에 상대다짐도 80, 85, 90, 95%로 제작하여 주입실험을 수행하였다. 주입 후 강도개선효과를 확인하기 위해 일축압축강도를 측정하였고, 주입노즐 주변의 구근형성을 통해 주입범위를 살펴보았다. 그 결과, SW시료는 상대다짐도 85% 이상에서 주입률이 10% 이하로 나타났으며, 지반의 상대다짐도에 따라 Bio-grouting의 주입률 및 고결범위 에 영향이 있음을 확인 할 수 있었다. The purpose of this research is to identify the effectiveness of injection with soil conditions by injecting CaCO₃(created by microorganism reaction), which was recreated with equipment in similar situ condition. To analyze our research, we made 2 cases of single-layer (SP, SW) in D 150mm X H 300mm. Layers were made by RC 70, 80, 85, 90, 95% of soil condition. We measured uniaxial compression strength with cone penetrometer and watched injection range by checking a bulb formation around the injection nozzle. As a result, the relative compaction(RC) in more 85% were not injected in SW, we could identify the effect of bio-grouting technology on ground in relative compaction(RC) of injection ratio and cementation range.
광양지역의 항타강관말뚝의 목표신뢰성지수 및 저항계수 산정
김대현(Daehyeon Kim),김현태(Hyeon-Tae Kim),임재춘(Jae-Choon Leem),김성헌(Sung-Heon, Kim),이증빈(Cheung-Bin Lee) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
Recently, the necessity of developing the load and resistance factor design(LRFD) for soft ground improvement method has been raised, since the limit state design is requested as international technical standard for the foundation of structures. In this study, to develop LRFD codes for foundation structures in Korea, target reliability index and resistance factor for static bearing capacity of driven steel pipe piles were calibrated in the framework of reliability theory. The 16 data(in Gwangyang) and the 57 dada(Korea Institute of Construction Technology, 2008) sets of static load test and soil property tests conducted in the whole domestic area were collected along with available subsurface investigation results. As a result, to prepare the introduction of the LRFD from international technical standard, considering the nature of Korea a resistance coefficient from working stress design method was suggested. We created the foundation of the resistance factor design. The result from this research will be the useful information for developing various foundation and soil structure under LRFD.