Method for calculating arch support anti-sliding stability safety degree of arch dam
A technology of anti-sliding stability and calculation method, which is applied in the field of arch dam engineering, can solve problems such as distortion of safety degree calculation results, engineering safety risks, uneconomical problems, etc., and achieve the effect of avoiding the distortion of safety degree calculation results
Active Publication Date: 2021-04-09
POWERCHINA CHENGDU ENG
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[0027] The present invention provides a method for calculating the anti-sliding stability safety degree of the abutment of an arch dam, which solves the partial coefficient of material performance in the existing abutment anti-sliding stability analysis method The determination of γm1f, γm1c, and γm2f is too arbitrary and rough, resulting in distortion of safety degree calculation results, safety risks or uneconomical engineering The problem
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[0056] The present invention will be further described below.
[0057] According to the national standard "Code for Geological Survey of Hydropower Engineering" (GB 50287-2016), the rock mass classification is divided into five categories: I, II, III, IV, and V; structural surfaces can be generally divided into rigid structural surfaces and weak structural surfaces. Structural surface and other two categories. That is to say, the geological category of the different areas on the sliding surface of the possible slider involved in the anti-sliding stability calculation of the abutment can only be one or a combination of several of the above seven categories. According to the statistical data of material parameters of different types of rock masses and structural surfaces, relatively accurate shear (fracture) strength variation coefficients corresponding to various types of rock masses or structural surfaces can be obtained, and then relatively accurate coefficients of variation ...
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The invention discloses an arch support anti-sliding stability safety degree calculation method, relates to the field of arch dam engineering, and solves the problems that the safety degree calculation result is distorted, and the engineering has safety risks or is not economical due to the fact that the determination of material performance subitem coefficients in the existing arch support anti-sliding stability analysis is too rough. The adopted technical scheme is as follows: the arch support anti-sliding stability safety degree calculation method comprises the following steps: firstly, determining a sliding block which possibly slides and a sliding surface of the sliding block; secondly, dividing a sliding surface of the sliding block which is likely to slide into sub-regions according to a rock mass classification line and a structural surface range boundary line, and respectively calculating the area of each sub-region and a material performance subitem coefficient; calculating sliding force on the sliding surface and total normal force perpendicular to the sliding direction, and decomposing the total normal force into normal force borne by each subarea according to the area proportion of each subarea; and finally, judging whether the skewback sliding block is safe or not according to a formula, and calculating the shearing resistance or shearing resistance safety degree of the skewback sliding block. The method is used for analyzing the anti-sliding stability safety degree of the arch support.
Description
technical field [0001] The invention relates to the technical field of arch dam engineering, in particular to a calculation method for the anti-sliding stability safety degree of an arch dam abutment. 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, in the design stage of arch dam engineering, 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 calculation and 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-dimension...
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Login to View More IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14
Inventor 庞明亮张冲张敬赵永刚李竞波潘燕芳王雨
Owner POWERCHINA CHENGDU ENG