![]() ![]() The critical slip circle has a safety factor = 1.99. Run Compute and then view the results in Interpret. The model represents a dam with a clay core, a transition zone, and a granular fill outer layer. You can rename Group 1 to “Full Reservoir Steady State”. ![]() #DRAWDOWN BAR FULL#Full Reservoir - Steady Stateįirst, we will analyze a dam with a full reservoir.įrom the Slide2 main menu, select File > Recent Folders > Tutorials Folder and read in the Tutorial 13 Drawdown1.slmd file. See Tutorial 17 for other rapid drawdown methods available in Slide2: The finished file can be found in File > Recent Folders > Tutorials Folder > Tutorial 13 Rapid Drawdown.slmd. The following scenarios will be analyzed: full reservoir, complete drawdown, partial drawdown. This tutorial will demonstrate rapid drawdown analysis using the B-bar method in Slide2. The pore pressure in drained materials will be calculated from the drawdown water table. This determines the change in pore pressure for undrained materials. In this case, the unloading is due to the removal of ponded water to the drawdown level. For a partial drawdown scenario, a drawdown water table is also defined. The final pore pressure at any point is the sum of the initial pore pressure and the (negative) excess pore pressure.ģ. ![]() The change in pore pressure for undrained materials is calculated due to the removal (unloading) of the ponded water according to Equation 1. For a complete drawdown scenario, it is assumed that all ponded water is removed from the model. This defines the initial pore pressure distribution and the initial weight of ponded water.Ģ. In the Slide2 Rapid Drawdown (B-bar method) analysis:ġ. In Slide2, this can be used to simulate the pore pressure changes due to rapid drawdown of ponded water in earth dams. Where B (B-bar) is the overall pore pressure coefficient for a material. If a load is removed quickly from a low permeability material, a “negative excess pore pressure” can be induced. The concept of excess pore pressure using the B-bar method can also be applied to unloading scenarios.
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