Efectul capacității portante a terenului de fundare asupra volumului și costului barajelor de greutate folosite la corectarea torenților [The effect of the bearing capacity of the foundation ground on the volume and cost of the gravity dams used in torrent control activity]
2018
Ciornei I.
The paper analyzes the effect of the bearing capacity of the foundation ground on the volume and cost of some dams. Using a theoretical model, were analyzed 125 dams, as resulted from the combination of five categories of useful heights, with five categories of loads in the spillway, and five foundation ground categories with known bearing capacity. In our simulation, we choosed often-used dams that have an upside-down foundation and are made of beton. When deciding the spill area, we took into account the most unfavorable load scheme and the safety factors imposed by norms and basic, plus special loads. In order to achieve an economical optimum, it is necessary to minimize the cost of each work, which translates into a function that aims to minimize the volume of the dam, and also to minimize the area of its section. The external and internal stability conditions became mandatory criteria for the objective function. The 125 dams were dimensioned using a Microsoft Excel spreadsheet prepared accordingly, while the minimization of the section was done using the Solver tool. It has been pointed that the section area and, implicitly, the volume of a 1 m wide dam stripe increases, as the load capacity the foundation ground. These volumes increase with the useful height of the work and the task of the spillway. The obtained results show that the specific investment indicator (determined as the ratio between the cost of the proposed works and the consolidated area) is also influenced by the nature of the foundation ground, and its use for comparing projects located at different conditions, at least in the case of dams, is not recommended.
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