To meet the growing demand for earthmoving projects for linear works, such as highways and railways, the Bruckner diagram begins to become impractical, given that surveying more polls are executed.
For example, in a railroad project, surveys are carried out on the slopes and on the platform in order to determine the CBR, or ISC (California Support Index), as well as the limits of liquidity, plasticity, expansion, homogenization factor, etc.
As such, material offerings are rated primarily by their CBR and expansion. In the scenario proposed above, the homogenization factor may be different for materials coming from slopes or cuts in the platform.
The demands of materials within the project also have requirements of characteristics. For example, the sizing of the railway superstructure usually arbitrates a ballast height and sublast with characteristics fixed. As the subbase can have desirable characteristics or not, it adopts reinforcement of the subject, which is calculated with sufficient height to deliver to the subgrade permissible loads to the ground.
Thinking about these difficulties, the DDM program comes as an option to solve this problem.