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김현태 ( Kim Hyun-tae ),김석열 ( Kim Seog-yeol ),노종구 ( Ro Jong-koo ),홍병만 ( Hong Byung-man ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This paper reviews depositional environments, consolidation characteristic of marine deposits along the Nam-Yang river mouth and then analytical solution of self-weight consolidation is made to find consolidated state. This area has been deposited through the short geological age(22year). It's deposition rate is as high as 70cm/year and the height of deposition may be 3~12m. It's known that this area is in the under-consolidated state from OCR and analytical solution. It is conclude that the under-consolidated state should be considered in prediction of consolidation settlement.
공길용 ( Kong Kil Yong ),김현태 ( Kim Hyun Tae ),노종구 ( Ro Jong Koo ),홍병만 ( Hong Byung Man ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.6
In order to expand agricultural lands in the western and southern coasts of Korean Peninsula, ,coarse soils excavated from hillsides have been used as fill materials for reclamation. In order to tackle with the problems and to confirm availability, research on soil improvement involve mixing cement to the fine wet soils. Required undrained shear strength (c<sub>u</sub>) for fill material was analyzed to be 0.34 ~1.2kgf/cm<sup>2</sup>. It has been known that when cement is added to high water content marine clay, its unconfined compression strength increased to 2kgf/cm<sup>2</sup>. Consolidation results show that pre-consolidation pressure increased to 1.8kgf/cm<sup>2</sup> and 3.4kgf/cm<sup>2</sup> with the addition of 3% and 5% of cement respectively. This result shows that low-height embankments could be constructed without significant compression. Since the effectiveness of improvement may be different site by site, the mix design for each site is necessary in order to optimize it. The process is first to determine aimed shear strength and then optimum mix ratio of cement after carrying out a series of tests.
김석열 ( Kim Seog Yeol ),김승욱 ( Kim Seung Wook ),노종구 ( Ro Jong Koo ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
Recently, the hydraulic fill method is commonly used in many reclamation projects due to lack of fill materials. The method of hydraulic fill in reclamation is executed by transporting the mixture of water-soil particles into a reclaimed land through dredging pipes, then the dredged soil particles settle down in the water or flow over an out flow weir with the water. The amount of the volume reductions of dredged soil is considered the sum of the overall settlement by desiccation shrinkage and self-weight consolidation and the loss of soil particles now over a weir. In the present study, hydrometer analysis was performed with the soil samples obtained before and after dredging to estimate the amount of soil particles residual at reclaimed area and the loss of soil particles, then it was suggested the method of determining the loss ratio of dredged soils from the test results. The hydrometer analysis of in-situ soil samples showed that the loss ratio of dredged soils is lowest at the nearest point to dredge pipe and the highest al the nearest point to out flow weir.