Lateral stability analysis of wedged geomembrane tubes using PFC2D |
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| Authors: | Liqiang Sun Changxi Yue Yuxiao Ren |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China;2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin, China |
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| Abstract: | The geomembrane tubes have been widely used for flood barriers, cofferdams, and breakwaters. To prevent the geomembrane tubes from rolling off or slipping along the ground, the simplest method is to place wedges on their downstream side. The numerical analyses using PFC2D are conducted in this paper to investigate the performance of the geomembrane tubes supported by two types of wedges, named as triangle and fillet wedges. Comparing to the triangle wedge, the fillet wedge reduces 10% of force concentration at the contact point between the geomembrane tube and the top angle. Nondimensional parameters are adopted in the numerical analyses to make the conclusions suitable for the general cases. It is found from the studies that the optimum wedge height to support the geomembrane tubes is 0.12L without depending on the initial pumping pressure nor the wedge types. The initial filling pumping pressure p0 of 0.162γwL and the wedge height hg of 0.15L are suggested to design the system which could extremely sustain external water level of 0.316L. |
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| Keywords: | Breakwater flood control geomembrane tube temporary dykes |
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