Safety assessment method for arch dam structure

Abstract

The invention relates to a safety assessment method for an arch dam structure, belonging to the technical field of arch dam engineering. The safety assessment method comprises the steps: a, along the dam height direction, dividing the arch ring of the arch dam into a plurality of branch arch rings connected in order from bottom to top; b, dividing each branch arch ring into a left part and a right part by taking the center line of the arch dam as a boundary line; c, selecting the arch ring arc length s, the arch abutment thickness T, the foundation deformation modulus R of a dam foundation corresponding to each left branch arch ring and each right branch arch ring and the born water pressure p as analysis parameters; d, combining the four corresponding analysis parameters into a single macro analysis parameter F; e, setting an analysis standard N; f, structural analysis: if the value of the corresponding F of each left branch arch ring or each right branch arch ring is larger than the value of the corresponding N, the structure is not safe; if the value of the corresponding F of each left branch arch ring or each right branch arch ring is less than the value of the corresponding N, the structure is safe. The safety assessment method for the arch dam structure has higher accuracy.

Description

technical field [0001] The invention relates to a safety evaluation method for an arch dam structure, belonging to the technical field of arch dam engineering. Background technique [0002] Safe and economical use of hydropower resources is an eternal theme and pursuit in hydropower development. Arch dams are dam types with superior safety and economy, and they are also very complex dam types. How to quickly evaluate the structural safety of arch dams Safety, as well as designing an economical arch dam shape under the premise of safety, are the problems that the dam workers strive to solve. [0003] How to quickly evaluate the rationality and safety of the arch dam layout from the macro data in the early stage of design, the dam workers established some macro indicators. Lombardi, a famous Swiss dam engineering expert, proposed to use the flexibility coefficient to judge the thickness of the arch dam empirically, and the flexibility coefficient C=A 2 / VH, where A—area of ​...

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Problems solved by technology

[0005] (1) A in the evaluation parameter is the area of ​​the cross-section of the arch dam. Under the same area, the shape of the valley may be U-shaped or V-shaped. Due to the difference in terrain, the loads acting on the arch dam are different, which cannot reflect Terrain conditions, the obtained macro indicators are not very instructive;

[0006] (2) The existing safety evaluation methods of arch dams have incorporated the concrete volume V of the dam body. The same concrete volume V can be arranged in a variety of shapes. Taking the arch crown beam section as an example, a triangular section can be used, and a triangular section can be used. The trapezoidal section can also be used as a rectangular section. Under different sections, the distribution of concrete is different, and the corresponding structural safety is different;

[0007] (3) The selected evaluation parameters cannot reflect the structural characteristics of the control parts. For the specific elevation arch ring, the size of the applied load, the degree of softness and hardness of the foundation, and the cross-sectional size of the structure are very important. The selected evaluation parameters do not can specifically reflect these structural properties

[0008] In view of the above limitations of the existing macro indicators, they are only suitable for some very rough statistical analysis and estimation, and the guidance for the layout design of the arch dam is not strong, and it is inconvenient to grasp and operate in the design

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