Stability analysis method for hydromechanical coupling of unsaturated soil slope

Abstract

The invention provides a stability analysis method for hydromechanical coupling of an unsaturated soil slope, and belongs to the technical field of rock and soil. According to the stability analysis method, a Barcelona basic model more conforming to the property of the unsaturated soil is adopted for a constitutive model of the unsaturated soil, and the influence of suction force and the influenceof shear strength and compressive strength of a soil body are considered in the constitutive model. According to the strength reduction method for unsaturated soil slope stability analysis, the shearstrength of a soil body is reduced by reducing the cohesive force and the friction angle of the soil body. In addition, the reduction of the compressive strength of the soil body is taken into account by reducing the consolidation pressure in front of the soil body. The stability analysis of the unsaturated soil slope is carried out under the Cosserat continuum frame, and the influence of the microstructure effect of the soil body on the stability of the macroscopic slope is considered to a certain extent. According to the stability analysis method, various influence factors are considered, and the stability analysis accuracy of the unsaturated soil slope is improved.

Description

technical field [0001] The present application relates to the field of geotechnical technology, and in particular, relates to a stability analysis method for hydraulic-mechanical coupling of unsaturated soil slopes. Background technique [0002] There are extensive and a large number of unsaturated soil slope landslide disasters in mountainous areas of our country, especially with the effect of rainfall, landslide disasters of unsaturated soil slopes continue to occur. In order to ensure the safety of engineering construction projects and the safety of people's life and property, the stability research of unsaturated soil slope should be a very important research topic of geological hazards. [0003] At present, the traditional methods for studying slope stability include: limit equilibrium method, limit analysis method, slip line field method, etc. However, these methods do not consider the stress-strain relationship inside the soil. It is a variety of stability analysis m...

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Problems solved by technology

[0006] However, the current strength reduction method for the stability analysis of unsaturated soil slopes often simplifies the seepage of unsaturated soil to the seepage model of saturated soil, and fails to fully consider the mechanical action of solid skeleton and porosity in the stability analysis of slopes. Coupling Effect of Water and Pore Gas Seepage

What's more, the stability analysis of unsaturated soil slopes often ignores the seepage effect of the slope's pore fluid, and does not consider the change of the suction field caused by the rainfall seepage in the used soil constitutive model Effect on slope stability

[0007] In addition, when analyzing the strength reduction method, for unsaturated soil slopes, only the traditional constitutive model of soil mechanics is used to reduce the shear strength of the slope soil, without fully considering the change of soil suction , the simultaneous reduction of the shear strength and compressive strength of the soil

In addition, the strength reduction method for the stability analysis of unsaturated soil slopes is developed and applied on the basis of traditional continuum mechanics, which lacks the consideration of the mesoscale effect of unsaturated soils, and the strength reduction method for slope plastic slip Lack of introduction of regularization mechanism in subtractive finite element simulation analysis

Therefore, the current strength reduction method for the stability analysis of unsaturated soil slopes has obvious deficiencies, and cannot accurately analyze the stability of unsaturated soil slopes.

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