This example concerns the stability of a reservoir dam under conditions of drawdown. Fast reduction of the reservoir level may lead to instability of the dam due to high pore water pressures that remain inside the dam. To analyse such a situation using the finite element method, a transient groundwater flow calculation is required. Pore pressures resulting from the groundwater flow analysis are transferred to the deformation analysis program and used in a stability analysis. This example demonstrates how deformation analysis, transient groundwater flow and stability analysis can interactively be performed in PLAXIS 2D.
The dam to be considered is 30 m high and the width is 172.5 m at the base and 5 m at the top. The dam consists of a clay core with a well-graded fill at both sides.
This exercise requires a PLAXIS 2D Ultimate license to be able to perform Fully coupled flow-deformation analyses.
The attached *.p2dxlog file contains all the commands to generate the model. With a Bentley Geotechnical SELECT Entitlement [GSE] licence, you can use the commands runner to open the *.p2dxlog file and to execute all commands in one go, see also this instruction.
PLAXIS 2D Tutorial 12: Potato field moisture content [Tutorials]
PLAXIS 2D Tutorial 14: Dynamic analysis of a generator on an elastic foundation [Tutorials]