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Complex foundation extra-high arch dam overall crack resistance design method

A design method and technology for high arch dams, which can be used in arch dams, dams, calculations, etc., and can solve problems such as crack resistance design methods for arch dams that have not yet been seen.

Inactive Publication Date: 2019-09-20
POWERCHINA CHENGDU ENG
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0015] (5) Element-free method
At present, the overall anti-crack design method of arch dams has not been proposed in the engineering field.

Method used

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  • Complex foundation extra-high arch dam overall crack resistance design method
  • Complex foundation extra-high arch dam overall crack resistance design method
  • Complex foundation extra-high arch dam overall crack resistance design method

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Experimental program
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Effect test

Embodiment

[0055] This embodiment takes the Jinping first-class arch dam as an example for illustration.

[0056] The shape design of the arch dam is completed by adopting the existing design method.

[0057] Using the arch beam method to analyze the mechanical characteristics of the arch dam and the results of the high stress area are as follows: figure 2 As shown, there is a tensile stress of 0.5MPa to 0.7MPa in the crackable area of ​​the middle and upper part of the right bank near the right dam heel at an elevation of 1830m (hereinafter referred to as RU area), so this area is a weak area.

[0058] Then the linear elastic finite element method is used for calculation. Stress characteristics and calculation of high stress area: RU area has tensile stress distribution, and the value of tensile stress area near the dam heel at 1780m elevation to 1700m elevation reaches 3.75MPa, see image 3 shown. Stress combination analysis is as follows: set tension-compression stress ratio k=-σ ...

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Abstract

The invention discloses a complex foundation extra-high arch dam overall crack resistance design method, relates to the technical field of hydropower station arch dam design, and provides the complex foundation extra-high arch dam overall crack resistance design method. The method comprises the following steps that A, arch dam body shape design is conducted; B, the arch dam is analyzed by adopting an arch beam method, a linear elasticity finite element method, a nonlinear finite element method and a geomechanical model test method; numerical calculation and physical test results are comprehensively compared, and arch dam deformation, stress characteristics and the overall damage process are analyzed, judged and grasped, so that crack initiation points, crack weak links and reinforcement key objects and parts of arch dam damage are found out; the comprehensive influence of various factors influencing arch dam cracking on arch dam cracking is systematically analyzed; C, arch dam anti-cracking measures are designed in a targeted manner according to different cracking mechanisms of the anti-cracking weak area and the controllable cracking influence factors of the anti-cracking weak area; and D, the effect of the anti-cracking measure is evaluated by adopting a three-dimensional finite element equal numerical analysis method.

Description

technical field [0001] The invention relates to the technical field of hydropower station arch dam design, in particular to an overall anti-crack design method for extra-high arch dams with complex foundations. Background technique [0002] Generally speaking, arch dams have better self-regulation performance. The dam body structure of arch dams has both arch and beam functions. Part of the load bears is pressed to both banks through the arch function, and the other part is transmitted to the dam through the function of vertical beams. Substrate bedrock. During the operation of the dam, when the external load changes or the material of the dam foundation deteriorates, causing the mechanical behavior of the dam body to deteriorate, the arch dam will self-adaptively adjust to complete the stress redistribution, so the arch dam has a strong overload capacity. Even if local cracks occur, the arch dam will rely on self-adjustment ability so that local cracks will not endanger th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E02B7/12
CPCE02B7/12G06F30/13G06F30/23
Inventor 王仁坤周钟薛利军张敬陈丽萍赵永刚饶宏玲
Owner POWERCHINA CHENGDU ENG
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