Finite Difference Method

Question 1

Implicit solution

Answer 1

Solution at each node is not known until the entire solution is known

Question 2

Explicit solution

Answer 2

Nonlinear solutions are produced in the same time as for linear problems

Question 3

Mixed discretisation

Answer 3

accurate modelling

Question 4

How is the 1D consolidation equation solved?

Answer 4

Analytically-exact closed-form solution
Numerically-approximate, either FEM or FDM

Question 5

What are the boundary conditions for a uniform distribution of initial excess pore water pressure

Answer 5

1. when t=0, pwp=0, vertical stress=0???
2. At top boundary z=0 pwp=0
3. Bottom boundary z=2H pwp=0 (where H is the length of the drainage path)

Question 6

For a soil layer in a grid what do the rows and columns represent?

Answer 6

Rows-Depth
Columns-Time