Ant Colony Optimization Analysis on Overall Stability of High Arch Dam Basis of Field Monitoring
Table 1
The key concept and parameters of the ACO model corresponding with the arch dam.
Concept
Define corresponding with the arch dam
Parameter discrete
Each group of concrete or rock mechanical parameters corresponds to a group of displacements and these displacements are defined as computed data. As the value of each parameter is continuous, some discrete points are chosen within the range.
Ant
An ant is an agent which moves between parameter discrete points. Each ant can choose a group of parameters during each search.
Objective function is expressed as the sum of the squares of the errors between the computed displacements and the field monitored displacements. is the vector of the mechanical parameters to be analyzed.
Pheromone update
The object of pheromone updating is to study the influence of material parameters on the modified ACO algorithm.
Inversion parameter
To find a group of parameters that contains every parameter and minimizes the value of .
Edge
Relationship of the discrete points between two adjacent parameters, for example, each of 50 discrete points of two adjacent parameters, there are 2,500 edges between parameters.
One cycle
Including two searches: “moveahead” and “moveback,” and output is two times parameters
One tour
A group of parameters, the tour is optimized depending on , average value of all the relating to ants choosing edge (, )