Study On Optimization Of Partition Of Concrete Gravity Dam

Gravity dam is a very important hydraulic structure. Under the action of water pressure and other pressure, it remains stable mainly on the stabilizing force generated by the weight of the dam, it offsets the tensile stress of dam heel caused by water pressure with the compressive stress generated by the weight of the dam. The purpose of the stress analysis is to make sure the dam to meet the requirements during the construction period and the using period, especially that the tensile stress of the dam heel meets the concrete tensile strength requirements.Meanwhile, it is to study and resolve design and construction of certain issues, such as the dam concrete partition and label certain parts of the reinforcement to provide the basis.When the gravity dam is built with one concrete material, under the water pressure, the stress distribution of various parts of the dam is very uneven, near the dam heel prone to greater tensile stress, while near the dam toe prone to greater compressive stress. Corresponding maximum tensile stress and maximum compressive stress is the important basis of dam design.How to control the maximum tensile stress near dam heel and the maximum compressive stress near dam toe has been the key issues in the design of gravity dam. In the design and construction of concrete gravity dam,in the past it had proposes the concrete partition,using the different grades of concrete in different areas.However it has not been up the study on optimization of reducing the maximum tensile stress near dam heel and the maximum compressive stress near dam toe.In this paper the ideology of Functionally Graded Material is introduced to gravity dam, applying the concrete materials of different ealsticity modulus in different areas of dam, to make the dam construction materials have the the characteristics of functionally graded,so gravity dam stress distribution can be improved,thus to attain the expected purpose of reducing the maximum tensile stress near dam heel and the maximum compressive stress near dam toe.Using ANSYS finite element software to analysis gravity dam stress distribution in a variety of partitioning schemes, compraing the stress magnitude of the dam key points in the variety of partition cases,to find the most reasonable partitioning scheme.The conclusion from comparative analysis: when using the smaller elastic modulus concrete materials near the dam heel,the tensile stress of the dam heel can be greatly reduced, thus improving the stress distribution of the dam to improve the bearing capacity of the structure, meanwhile it can reduce the amount of work, reduce project costs, to achieve economic applicable results.