مقايسه فني و اقتصادي دو روش تسليح دايك هاي ساحلي (با استفاده از نرم افزار PLAXIS)

Technical and economical comparison between two reinforcement methods of coastal dykes (Using PLAXIS F.E.M. Numerical Model)

One of the important parameters in design of coastal dykes is reinforcement of slope of body and base of dyke. In this paper, with pointing on two customary reinforcement methods of coastal dykes, the reinforcement of hendijan coastal dyke (with 40 kilometers length at Khozestan province) has investigated. In first method, geo-textile materials situated inside the slopes of dyke body horizontally. The length of geo-textile reinforcement materials and the spacing between layers have been investigated in more details. In second method, reinforce the dyke foundation by utilize a geo-textile layer over the foundation bed. In this method the effect of using reinforcement material in prevention the failure of dyke bed have been investigated. The results of these two methods has compared with each others. The First method is reinforcement by utilize geo-textile filaments in parallel layers in dyke body. The second method, utilize a layer of geo-textile in the bed of dyke. Presented analyzes simulated by PLAXIS FEM model (Developed by Delft University of Netherlands). Utilized different material parameters have used as for available materials at project site in south coasts of Iran. In this paper, decrease of lateral slope of dyke as for suitable stability, is most cared. The results of analysis indicate better efficiency and economic profit by utilize a layer of geo-textile in the bed of dyke. Because of poor soil layer material in dyke bed layer, the results show that using reinforce material in bed has more effect in final strength and endurance of the dyke.