Abstract
As a kind of rapid filling hydraulic structure, geomembrane tube can effectively act as flood barriers and cofferdams for flood risk management. L-shaped block is used to support geomembrane tube to prevent it from rolling. The contact force between the L-shaped block and the geomembrane tube is analyzed by using particle flow code (PFC2D) software, and the overturning stability of the L-shaped block is calculated. The relationship between the key factors and the overturning stability was established. It is found that the central angle of the L-shaped block has little influence on the overturning stability. The overturning stability decreases with the increase of the initial pumping pressure. Keeping Lw/Lb unchanged, increasing Lb will improve the overturning stability where Lw and Lb are the width and the height of the Lshaped block. Under the ultimate water level, when 1.23 Lbcr < Lw≤1.55 Lbcr, the L-shaped block is in the state of overturning stability where Lbcr is the critical height of the L-shaped block. The initial pumping pressure is less than 0.152γL, the L-shaped block is in the state of overturning stability with Lw/Lbcr =1.0 where L is the cross-sectional perimeter of the geomembrane tube and γ is the unit weight of the filling liquid, on the contrary, Lw/Lbcr must be greater than 1 to ensure its overturning stability.
Highlights
Flood disasters gradually tend to be more frequent and intensive, causing heavy losses to urban underground facilities and aboveground buildings
A lot of analytical solutions have been proposed to studied the cross-sectional shape and the tensile force of the geomembrane tubes resting on rigid foundation (Leshchinsky, Leshchinsky, Ling, and Gilbert,1996; Plaut and Suherman,1998; Cantré and Saathoff,2011)
The cross-sectional shape of the geomembrane tube obtained by the two methods are shown in Figure 4, which further verifies the rationality of applying the PFC2D to calculating the geomembrane tube
Summary
Flood disasters gradually tend to be more frequent and intensive, causing heavy losses to urban underground facilities and aboveground buildings. A lot of analytical solutions have been proposed to studied the cross-sectional shape and the tensile force of the geomembrane tubes resting on rigid foundation (Leshchinsky, Leshchinsky, Ling, and Gilbert,1996; Plaut and Suherman,1998; Cantré and Saathoff,2011). The effects of the foundation strength and solid-liquid fillings on the cross-sectional shape and tensile force of the geomembrane tube have been examined (Guo, Chu, and Nie,2014; Guo, Chu, Yan, and Nie,2013; Guo, Chu, and Yan, 2011; Plaut, and Klusman, 1999). The Mathematica have been applied to study the geometric characteristics and tensile force of the geomembrane tube placed on rigid foundation with arbitrary geometry (Ghavanloo, and Daneshmand, 2008). According to the contact force between the L-shaped block and the geomembrane tube, the calculation method of contact stress and overturning stability will be put forward to study the performance of the L-shape block.
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