| Summary: | 碩士 === 國立暨南國際大學 === 土木工程學系 === 105 === Two kinds of erosion control geosynthetics were used in this study. Under two rainfall intensities (100、65 mm/hr) and three slope gradient (30、45、50 degree).Wooden sand boxes with 1.98m long , 0.65 m wide and 0.25 m high, was used with soil moisture sensors and a pore water pressure sensors to monitor the interior soil moisture response to the rainfall infiltration. The current study features the measurement of solid and water exhaust from the slope subjected to rainfall. This substantiates the investigation into the relation between the soil moisture response and the solid exhaust process.
This study found that the saturation near the toe and the resulting unstable zone accounts for the start of the retrograde slope failure. This study judged that dissipation of the suction (or negative pore water pressure) in the soil slope resulting in the shear strength reduction of the soil is the trigger for shallow slope failures.
This study found that geosynthetics would decrease soil losses, and the erosion resistance effect has the best effect at 45 degrees. However, the erosion control geosynthetics can reduce the peak value of pore water pressure and the rising rate of water content, and can effectively intercept rainwater on the geosynthetics surface.The pore water pressure is related to the failure scale of the slope, and the erosion control geosynthetics can reduce the pore water pressure .
Key words : Erosion control geosynthetics 、shallow slopes 、rainfall 、artificial rainfall test 、pore water pressure 、water content
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