Abstract
Sandbags are often used to hold back floodwaters. Recently, water-filled tubes have been introduced as an alternative temporary flood barrier. Some failures have occurred due to rupture or excessive movements. The results of a numerical investigation of these tubes are presented here, along with some test results. The two-dimensional analysis uses the finite-difference program FLAC. The cross-section of the tube is modeled with beam elements, and the Mohr–Coulomb soil model is adopted. External water of varying heights is applied on one side of the tube, and a wedge is placed on the downstream side to inhibit rolling or sliding. The cross-sectional deformations, underseepage flow rates, and pore pressure beneath the tube are determined, along with the critical floodwater height. The numerical results compare well with those from the experiments. This research demonstrates that water-filled tubes can provide an effective alternative to sandbags for holding back floodwaters.
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