Method for calculating stability safety factor of concrete gravity dam under multi-dam-section combined skid resistance condition

Abstract

The invention relates to a method for calculating the stability safety factor of a concrete gravity dam under a multi-dam-section combined skid resistance condition and belongs to the field of gravity dam stability analysis. According to the method, a three-dimensional stability analysis calculation model is established on the basis of a three-dimensional rigid body limit balance analysis and strength reduction method by aiming at a situation that key slots are formed or grouting is performed between dam sections of the concrete gravity dam so as to combine slide resistance; by introducing a plurality of reasonable assumption and unbalanced force transfer concepts, the statically indeterminate problem of combined anti-sliding stability of multiple dam sections along a dam foundation surface is converted into a statically determinate problem; on the basis of solving out the independent anti-sliding safety factor of the dam sections, the transfer of unbalanced forces of adjacent dam sections on a river valley side is considered, circulation calculation is performed, and the overall stability safety factor of combined slide resistance of multiple dam sections, the sequence of sequentially achieving limit balance by each dam section and the local stability safety factor of the dam sections are solved out. The method has the characteristics of easiness for realization of programming, reasonable calculation result and the like, and is convenient in popularization and application in practical engineering.

Description

technical field [0001] The invention relates to a gravity dam anti-sliding stability analysis method, in particular to a method for calculating the stability safety factor of a concrete gravity dam under the joint anti-sliding condition of multiple dam sections, belonging to the technical field of gravity dam anti-sliding stability analysis along the dam base surface, and also It can be used as a reference for gravity dam deep anti-sliding stability and slope stability analysis. Background technique [0002] It is an important content in the design of gravity dams to check the stability and safety of the dam body against sliding along the dam foundation. "Code for Design of Concrete Gravity Dams" (SL319-2005) adopts the shear strength and shear strength formulas based on the two-dimensional rigid body limit equilibrium analysis for checking and calculation. Anti-skid has good applicability. With the continuous expansion of China's hydropower construction scale, many gravit...

AI Technical Summary

Problems solved by technology

To solve such problems, the shear strength and shear strength formulas stipulated in the code will obviously no longer be applicable; although numerical analysis methods such as finite element method can also be solved, they are time-consuming and laborious, and it is difficult to popularize and apply them in engineering practice

Images