Arch seat anti-sliding stability safety calculation method for arch dam

Abstract

The invention discloses an arch seat anti-sliding stability safety calculation method for an arch dam, relates to the technical field of arch dam projects and solves the problems that a shear friction formula or pure friction formula is selected to perform arch seat stability analysis according to the level of an arch dam building, stress and damage characteristics of a sliding surface are not considered, and project risk or project diseconomy is caused by safety calculation result distortion in an existing method. The method includes the steps: firstly, determining a sliding mode of a slider as a double sliding mode or single sliding mode; secondly, determining the damage type of each loaded sliding resistance surface as anti-shearing-off damage or anti-shearing damage; thirdly, performing combination to obtain five damage types of the slider and calculating anti-sliding stability of the slider by selecting different formulas; finally, judging whether the slider is stable or not according to safety margin coefficient and evaluating arch seat anti-sliding stability safety. The method follows the basic principle of rock mechanics, deformation damage characteristics of the stressed slider are more really and accurately reflected, and accuracy of calculation results is higher.

Description

technical field [0001] The invention relates to the technical field of arch dam engineering, in particular to a method for calculating the anti-sliding stability safety degree of an arch seat of an arch dam. Background technique [0002] Anchor stability analysis is one of the most important problems in arch dam design, and it is also the most difficult problem to solve. Modern arch dam construction practices show that the real potential danger of arch dams lies in the stability of the abutments on both banks. Therefore, at each stage of arch dam engineering design, whether the abutment has sufficient anti-sliding stability and safety has always been the focus of analysis and demonstration. [0003] Numerical calculation method is the main analysis method widely used at home and abroad. Common numerical calculation methods can be classified into the following three categories: rigid body limit equilibrium method, rigid body spring element method, and three-dimensional nonli...

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Problems solved by technology

[0044] The purpose of the present invention is to propose a calculation method of anti-sliding stability safety degree of abutment which follows the basic principles of rock mechanics, more accurately and truly reflects the type of slip surface and the deformation and failure characteristics of the stressed seat, and solves the existing problems. Methods The shear-friction formula or the pure friction formula are used to analyze the stability of the arch seat according to the level of the arch dam structure, without considering the force and failure characteristics of the slip surface, which is inconsistent with the basic principles of rock mechanics, resulting in the calculation of the safety degree. Engineering risk or engineering uneconomical problems caused by distortion

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