Method for calculating slope stability safety coefficient based on strength reduction of humidifying condition

Abstract

The invention discloses a method for calculating the slope stability safety coefficient based on strength reduction of a humidifying condition. The method comprises the steps of testing the dry density rhod, the natural moisture content omega1, and the percentage of saturated moisture content omega2 of a slope soil body sample, testing the cohesive force c and internal friction angles of samples with different moisture contents, and calculating the volume weight gamma of the samples, wherein the formula of internal friction angles is shown in the description; drawing the relation curves of the cohesive force c and the internal friction angles respectively with the moisture content omega, and obtaining a mathematic formula of a fitting relation curve; adopting a dichotomy approximation method and considering the volume weight change, and calculating the moisture content omegaF when the slope is in critical failure; calculating the slope stability safety coefficient F. According to the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition, anti-shearing strength of the slope soil body is reduced based on the humidifying condition, the method better conforms to the engineering practice that the moisture content of the soil body is increased, and thus the strength is lowered due to rainfall infiltration or irrigation or the like, and the shortcoming that a prior strength reduction method is not clear in mechanical concept is overcome. When strength reduction is conducted, the adverse influence of the increase of the volume weight of the soil body on the slope stability is further considered. Therefore, the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition is more scientific and safer.

Description

technical field [0001] The invention relates to the field of loess slope engineering, in particular to a method for calculating slope stability and safety factor based on strength reduction of humidification conditions, which is used for analyzing and calculating the stability and safety factor of loess slope engineering. Background technique [0002] Loess slope stability and safety factor calculation and analysis methods are important scientific issues in the field of geotechnical engineering. At present, there are two main types of slope stability analysis methods: one is the limit equilibrium method based on the rigid body limit equilibrium theory, and the other is One is the numerical calculation method represented by the finite element method. The limit equilibrium method assumes the rock and soil mass of the slope as a rigid body, and does not consider the influence of the deformation of the rock and soil mass itself on the stability of the slope. , the assumption of...

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Problems solved by technology

However, the finite element strength reduction method has the following disadvantages: (1) The mechanical concept of strength reduction is not clear, and the strength reduction cannot reflect the mechanical mechanism of soil failure; (2) In the process of traditional strength reduction method, cohesion and The internal friction angle adopts the principle of proportional reduction, which does not conform to the law of progressive damage and destruction of soil

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