Arch dam safety evaluation method based on structural strength, foundation skid resistance and overall stability

Abstract

The invention discloses an arch dam safety evaluation method based on structural strength, foundation skid resistance and overall stability, and relates to the field of arch dam safety control analysis and design. The arch dam structural strength safety coefficient K1 is obtained by calculating the ratio of the strength allowed to be used for arch dam large-size concrete to the pressure stress calculated through the multi-arch beam method revised after considering influences of the calculation parameter and other factors, and the given evaluation standard is more reasonable and credible. The arch dam foundation skid resistance safety evaluation is conducted by giving possible sliding block modes such as large sliding blocks, small sliding blocks and stepped sliding blocks and the application guide and the control index K2 of the calculation formula on the basis of the rigid limit equilibrium method. The arch dam overall safety evaluation method includes the step that overload coefficient control indexes such as structure cracks and nonlinear deformation are given by conducting experimental research on the basis of a three-dimensional nonlinear finite element method and a geomechanics model and further increasing the overload capacity and the overload coefficient K3 of the water unit weight on the basis of the basic combination effect. An arch dam static force design safety evaluation system is formed by K1, K2 and K3 evaluation mentioned above.

Description

technical field [0001] The invention relates to the field of analysis and design of arch dam safety control, in particular to an arch dam safety evaluation method based on structural strength, foundation anti-skid and overall stability. Background technique [0002] For a long time, the safety control of arch dam design in various countries in the world mainly consists of two parts: the safety factor of structural material strength and the safety factor of foundation anti-sliding stability. According to my country's "Code for Design of Concrete Arch Dams" (DL / T5346-2006) and "Code for Design of Concrete Arch Dams" (SL282-2003), the safety factor of the structural material strength of an arch dam refers to the standard value of the compressive strength of the dam concrete and the structural allowable The ratio of compressive stress. Among them, the standard value of the concrete compressive strength of the dam body is the 90-day age compressive strength with a 80% accuracy ra...

AI Technical Summary

Problems solved by technology

[0016] 1) The code stipulates that the shear-friction formula is used to calculate the safety factor of the foundation anti-sliding stability for Class I high dams, and the control requirement that the safety factor is not less than 3.5 is given, but there are huge differences in the properties of the sliding surface and the arch thrust in actual use. This leads to the distortion of the calculated safety value of the anti-sliding stability of the foundation, which is also the reason why the calculated safety factor of the anti-sliding stability of some extra-high arch dam foundations does not meet the 3.5 required by the code

[0017] 2) There is a problem of coordination between the foundation anti-sliding stability calculation formula and the safety index

[0018] 3. The safety degree of structural materials and the safety degree of foundation anti-sliding stability cannot represent the overall and actual safety degree of the arch dam

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