The effectiveness of geosynthetic to prevent slope erosion

Slope failure or landslide always related to the slope works at the hilly area. One of the factors that contribute to this problem when slope surface is exposes to the rainfall or surface run-off that eroded particle from slope surface. Suitable protected layer and types of vegetation is important in this final year project. This final year project was carried out to determine the actual value of sedimentation when using protected layer compared to unprotected layer or bare control slope, also carried out the soil classification at the case study. Geogrid were selected to be used in this study and two types of grass were selected as earth cover is Signal grass and Japanese millet. From the shear strength test of soil at Bukit Gambang, the average of shear strength is 183.17 kPa with angle of friction 37.1°. From the soil classification test, this soil is sand soil with absence of fine gravel and little silt and clay. To ensure the successfully of this study, four (4) slope model were develop to determine the sedimentation value of the slope surface. Actual values of sedimentation were determined by using total suspended solid method. This study conclude that slope surface that contain Japanese millet not effective either control or protected slope model. Slope surface that protected with Geogrid shows effectiveness where can reduce sedimentation up to 6.98x lO g/mL per m 2 . Side analysis form this study shows that Signal grass have effectiveness to protect slope surface by reducing 2.72x10 3 g/mL per m 2 sedimentation. The usage of Geogrid with Signal grass totally shows the effectiveness to solve slope surface erosion problem that can reduce sedimentation up to 3.86x1(1 3 g/mL per m2