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이행우 ( Lee Haeng-woo ),장병욱 ( Chang Pyoung-wuck ),장웅희 ( Chang Woong-hee ),정인영 ( Chung In-young ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
본 연구는 방조제에서 바닥사석충의 유·무 및 성토충의 길이에 따라 성토충의 침투특성에 미치는 영향을 파악하기 위하여 수리모형실험을 실시하였으며, 아울러 흐름상태가 다른 바닥사석충의 흐름을 정확히 해석하는가를 알아보고자 수치해석으로 성토충의 침윤선을 계산하여 실측치와 비교분석하였다. 본 연구의 결론은 다음과 같다. 1) 성토충에서 측정한 수두와 수치해석으로 계산한 수두가 차이를 보였으며, 이는 바닥사석충의 흐름특성이 흙속의 흐름과는 상이한 것으로 판단된다. 2) 바닥사석충의 유·무에 따라서 성토충의 침투특성이 크게 차이가 났으며 또한 바닥사석충의 길이에 따라서 방조제 침투안정에 영향을 미치는 것으로 나타났다. 3) 향후 연구를 위한 제안으로 방조제의 실제에 부합하는 침윤선 계산 및 침투안정해석을 위하여 바닥사석충의 흐름특성 및 수두손실에 대한 연구가 필요함. One of the major role of the sea dike is protecting farmlands from the storm surges and tidal wave attacks. Furthermore, sea dike makes a bit easier to reclaim the landside of the sea dike and supplies water to the farmland and factory. Although water in the landside of the sea dike is likely to non salt water, it is practically allowed and maintained some extent of salt concentration because of the construction of bottom riprap. Flow in the bottom riprap is an interesting topic to study in order to maintain water with minimum salt concentration in the fresh water. Generally, the change in phreatic line has affected to the overall stability and it may cause a piping and sliding of the sea dike. This paper presents the change in phreatic line through flow in bottom riprap in the sea dike. This study is performed and compared to seepage analysis and prototype hydraulic model test results.
송창섭 ( Song Chang Seob ),반창현 ( Ban Chang Hyun ),장웅희 ( Chang Woong Hee ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
In this study, a series of test was conducted to show the characteristics of freezing-thawing process on soilcrete using the soft clay in a redevelopment paddy area, was treated with cement and several additives such as Beestar, CaSO<sub>4</sub>, MgO, and Polypropylene fiber. From the results of test, it was found that first additives-cement and beestar-was effective for compressive strength, and the resistance against freezing-thawing process was improved by secondary additives, in the order their effectiveness, i.e. CaSO<sub>4</sub>. Synthetic fiber, MgO, and Beestar.
이행우,장병욱,장웅희,김시운,Lee Haeng Woo,Chang Pyoung Wuck,Chang Woong Hee,Kim See-Woon 한국농공학회 2005 한국농공학회논문집 Vol.47 No.4
A series of laboratory tests was carried out fur analyzing of seepage characteristics of two-layers embankment model which consists of gravel and earth fill layers. Gravel layers were built under the earth fill for a half and one-third width of earth fill of the model. Permeability of earth fill was ranged between $5.00\times10^{-5}\~3.00\times10^{-4}\;m/s$.. The tests were performed with hydraulic gradients(i), $0.10\~0.55$. From the test results, hydraulic head of earth fill with gravel layer was 1.6 times higher than that of earth fill without gravel layer. Seepage rate was increased up to $4\~22$ times and safety factor for piping was decreased to $13\~43\;\%$ comparing the earth fill with gravel layer to that without gravel layer. The gravel layer under the earth fill could, in general, give some serious seepage problems to seadike embankment.