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Transient Groundwater Analysis趣味智力题
A transient groundwater analysis may be important when there is a
time-dependent change in pore pressure. This will occur when
groundwater boundary conditions change and the permeability of the
material is low. In this ca, it will take a finite amount of time to reach
steady state flow conditions. The transient pore pressures may have a
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large effect on slope stability.
This tutorial describes how to perform a transient groundwater analysis in Slide using finite elements. A subquent tutorial will describe how
this affects slope stability calculations.
The finished product of this tutorial can be found in the Tutorial 18
Transient Groundwater.slim data file. All tutorial files installed with Slide 6.0 can be accesd by lecting File > Recent Folders > Tutorials
Folder from the Slide main menu.
Topics Covered
壁画设计•Finite element groundwater epage analysis
•Transient groundwater
Geometry
Model
Start the Slide Model program.
乘机而入Project Settings
Open the Project Settings dialog from the Analysis menu. Set the
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Stress Units to Metric, t the Time Units to Hours and the Permeability
炒汤圆Units to meters/cond as shown.
Click on the Groundwater link on the left side. Leave the Method as
Water Surfaces. Select the Advanced checkbox and choo Transient
Groundwater.
The Method refers to the method ud to obtain the initial state for the
transient groundwater analysis. In this tutorial we will simply specify an initial water table but it is also possible to specify a grid of pore pressures
or even to perform a steady state finite element analysis to get the initial state. This is discusd further in subquent tutorials.
Now click on the Transient link on the left. Here we need to specify the
times at which we wish to obrve pore pressure results. Change the Number of Stages to 5. Enter the times for each stage as shown.
Do not check the boxes to Calculate SF (safety factor). In this tutorial we will only look at the groundwater modelling. A subquent tutorial will combine this with slope stability calculation.
Click OK to clo the Project Settings dialog.
You will now e a blank screen with two tabs at the bottom. One for Slope Stability and one for Transient Groundwater. The first part of this tutorial involves tting up the model geometry. This can only be done in the Slope Stability mode, so click on the tab for Slope Stability.
Boundaries
The model reprents a dam with a toe drain. Here we will define the geometry of the problem.
Make sure that you are in ‘Slope Stability’ view. Select the Add
External Boundary option in the Boundaries menu and enter the following coordinates:
0 , 0
20 , 10
24 , 12
28 , 12
52 , 0
40 , 0
c (to clo the boundary)
Hit Enter to finish entering points. The model will look like this:
Select Define Materials from the Properties menu. Change the name
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of Material 1 to Soil. The rest of the parameters we don’t care about since we are only performing a groundwater analysis, so leave them with the
default values. We will t the groundwater flow parameters later.
