Analyzing and determining method for bridge foundation slope stable slope-angle line

Abstract

The invention discloses an analyzing and determining method for a bridge foundation slope stable slope-angle line. On the basis of the inversion of slope rock-soil physics and mechanics parameters, the action width, embedded depth and load effect modes of a foundation are considered, and the specific position of the stable slope-angle line is analyzed, so that arrangement and engineering design demands for the bridge foundation in a steep slope can be met. The method comprises following technical steps: S1, determining a critical slide surface for the slope parameter inversion; S2, working out the comprehensive cohesive force of a slope rock-soil mass through inverse calculation according to a limit equilibrium state; S3, setting the initial position of the stable slope-angle line; S4, recalculating the slope stability under a bridge foundation loading effect according to the obtained cohesive force of the slope rock-soil mass through inversion calculation; S5, determining whether a safety factor is larger than or equal to a designed safety factor; and S6, obtaining the stable slope-angle line through the analysis.

Description

technical field [0001] The invention belongs to the engineering design field of bridge piers and abutments in mountainous areas, and relates to a method for analyzing and judging the stable slope angle of the slope when the pier and abutment foundation is placed on a high and steep slope. Background technique [0002] The concept of "stable slope angle line" of railway bridge foundation slope was proposed in my country's "Railway Engineering Geological Survey Specification". Therefore, the evaluation of bank slope stability is one of the key points of engineering geological survey and mapping in this kind of area. The code requires that the bridge foundation in loess areas with steep bank slopes is usually set below the stable slope angle to ensure engineering safety, and that bank slope stability evaluations should also be made for steep bank slopes in bedrock areas to provide a basis for engineering foundation settings. However, the code does not make suggestions on the an...

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Problems solved by technology

[0003] Aiming at the problems in the above-mentioned prior art when determining the position of the stable slope angle line that there are few considerations and poor applicability, the present invention provides a new method for analyzing and judging the stable slope angle line of the bridge foundation slope. On the basis of inversion of rock and soil physical and mechanical parameters, consider the foundation action width, embedding depth and load action mode, determine the specific position of the stable slope angle line, so as to meet the needs of bridge foundation layout and engineering design in steep slope areas

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