Boundary and Initial Conditions
The boundary and initial conditions are defined as follows:
1. All boundaries around the foundation rock satisfy the adiabatic conditions:
0
.
0
n
T
(This means that there is no change in temperature in the direction
normal to the planes).
Where T is the transient temperature, n the outer unit normal.
The dam and foundation that are exposed to the atmosphere satisfy the following
condition (as defined previously).
B
f
T
T
h
n
T
K
Where K is the thermal conductivity, h
f
is the film coefficient and T
B
is ambient
temperature.
2. Initial condition. The initial temperature for all nodes of foundation is assigned
from rock temperature. The initial temperature of each layer of the dam is set to be
equal to the placement temperature.
3. Structural boundary conditions. The foundation rock is infinite and no horizontal
movement is allowed; thus the foundation rock is restricted in all horizontal
directions (This means that there are rollers on vertical boundaries and pins at the
bottom boundary) and the vertical direction movement is restricted in the bottom
9
boundary. For three dimension structural analyses, the RCC body is free at
contraction joint, and constrained at plan of symmetry, where the monolith block
is 60 meter and the design thickness is 30 meter, see Figure 8 for 2D and 3D
structural boundary conditions.
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