• Journal of the Korean GEO-environmental Society
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• v.5 no.4
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• pp.73-79
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• 2004

Mountain side ditch is constructed at the top of cutting slopes around road and it drains the surface water that flowed from upper part. Mountain side ditch is constructed to keep away the influx of the surface water into cutting faces. However, if Mountain side ditch is constructed on the top of cutting slopes, it is cause of trouble. For example, difficulty of quality control and lack of drainage faculty. Therefore, the faculty and establishment propriety of mountain side ditch are evaluated seriously, according to the condition of ground, topography and rainfall in this paper. Results from the study for the numerical analysis of effect of mountain side ditch indicate that safety factor is enlarged about 3% at rainfall.

• Journal of the Korean GEO-environmental Society
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• v.6 no.2
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• pp.15-20
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• 2005

Moutain side ditch is constructed at the top of cutting slopes around road and it drains the surface water that flowed from upper part. About 70% of a country is composed of mountains so occurrence of cutting face by road general observation is necessary. Instability of cutting face is increased by permeation of underground water by rainfall the summer, pore water pressure increases. However, moutain side ditch is constructed on the top of cutting slopes has some troubles. For example, difficulty of qualify control and lack of drainage faculty. Therefore, stability variation of cutting slope is analyzed by hydraulic conductivity and construction depth of mountain side ditch and effective depth of mountain side ditch is decided in this paper.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.1
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• pp.109-115
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• 2008

Malfunction of gutter systems in the slope area accelerate to percolate surface flow into underground and to cause the decrease of soil strength, Overflowing from gutter causes soil erosion from slope surface, secondary it is one of the main reasons to cause disaster in the hillside area. Much researches were reported and are undergoing about flood disaster in the down stream area, but rare in the upper reach(hillside). It is considered that improving function of gutter in the hillside is very important to prevent the disaster caused by rainfall. In this paper, After analyzing relationship between rainfall and disaster on the hillside in Busan, researches about having surface flow run into gutter effectively and preventing from overflowing outside of gutter on the hillside in Busan were carried out. Improved design methods of gutter are suggested to mitigate disaster in the sloping area by analysis of collected data and hydraulic model test.