Method for determining stability coefficient of high subgrade of V-shaped gully

Abstract

The invention discloses a method for determining the stability coefficient of a high subgrade of a V-shaped gully. The method comprises the following steps: (1) calculating the two-dimensional stability safety coefficient FS of a characteristic section in a gully center by the Spencer method of a two-dimensional limit equilibrium method or a two-dimensional finite element strength reduction method at a slope angle beta of the high subgrade of the V-shaped gully; (2) calculating the three-dimensional stability safety coefficient of the high subgrade restricted by a side bank at a slope angle beta; (3) constructing a regression model between the ratio of the three-dimensional stability safety coefficient to the two-dimensional stability safety coefficient at the slope alpha of the side bank to calculate the regression equation of a corresponding three-dimensional effect coefficient; (4) searching a three-dimensional effect coefficient graph to determine the three-dimensional effect coefficient according to the corresponding three-dimensional effect coefficient expression in the graph; and (5) correcting the stability safety coefficient of the high subgrade restricted by the side bank at the slope angle beta, wherein beta is the slope angle; and alpha is the slope of the side bank. The method provided by the invention has the following beneficial technical effects: the planar strain and three-dimensional strain of the high subgrade of a complex geometric structure are comprehensively considered, thus the safety coefficient is more accurate, the structure stability is improved, and the quantity of masonry in the engineering is reduced.

Description

Method of Determining the Stability Coefficient of V-shaped Gully High-Filled Subgrade technical field The invention relates to a high-fill roadbed construction technology, in particular to a method for determining the stability coefficient of a V-shaped gully high-fill roadbed. Background technique The common high-grade highways crossing gullies in mountainous areas often use high-fill roadbeds due to the constraints of terrain conditions and road alignments, and the subsequent stability problems of roadbeds have also become very prominent. In actual engineering, because the two-dimensional limit equilibrium method is effective and relatively reliable, it is often firstly adopted by the engineering community. However, the complex geometry problem of high-fill subgrade in gully areas cannot be simply regarded as a plane strain problem when analyzing its stability. Using the two-dimensional limit equilibrium method to analyze the stability of high-fill subgrades in gully ar...

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Problems solved by technology

In actual engineering, because the two-dimensional limit equilibrium method is effective and relatively reliable, it is often firstly adopted by the engineering community. However, the complex geometry problem of high-fill subgrade in gully areas cannot be simply regarded as a plane strain problem when analyzing its stability. Using the two-dimensional limit equilibrium method to analyze the stability of high-fill subgrades in gully areas is obviously too simplified, and cannot express the authenticity of high-fill subgrades in gully areas, and the safety factor obtained from the analysis will also have deviations

At present, the three-dimensional limit equilibrium method is not very mature, and cannot be used independently for the analysis of the stability of high-fill subgrades in gully areas

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