Computational simulation method of flow slide catastrophe of rock and soil material

Abstract

The invention relates to a computational simulation method of a flow slide catastrophe of a rock and soil material, belonging to the technical fields of computational rock and soil mechanics, geologic hazard prevention and control and geologic environment protection. Aiming at the limitation that the conventional grid-based computing method is only suitable for small-deformation analysis, the invention discloses a computational simulation method of an entire flow slide catastrophe process of the rock and soil material based on smoothed particle hydrodynamics (SPH). According to the method, a Navier-strokes equation is used as a control equation, solid phase and liquid phase of the rock and soil material are described by using a sub-load face Cambridge model and an incompressible fluid constitutive model respectively, porous medium theory and darcy law are introduced to calculate solid-liquid coupling acting force, and a computation model, which considers the full coupling of water and soil, of the flow slide catastrophe of the rock and soil material, is established. According to the computational simulation method, the entire process of large-deformation flow damage of the rock and soil material can be effectively represented, and the fluidization characteristic of the rock and soil material is captured, so that powerful scientific basis is provided for engineering design, engineering construction, disaster prevention and reduction and the like of high-risk areas of the flow slide disaster, and meanwhile, application of the computational rock and soil mechanics in the technical fields of actual engineering construction, geologic hazard prevention and control and the like is forcefully promoted.

Description

technical field [0001] The invention relates to a calculation and simulation method for flow-slip catastrophe of rock-soil materials, and belongs to the technical fields of rock-soil computational mechanics, prevention and control of geological disasters, and protection of geological environment. Background technique [0002] In recent years, under the combined effects of natural factors such as earthquakes and rainfall and human activities, the frequency of geological disasters has become higher and higher, and the harm to human life and property has become more and more serious. These geological disasters, such as high-speed and long-distance landslides induced by earthquakes, lateral flow after soil liquefaction, debris flow, landfill instability and slippage, etc., are essentially large deformation flow failure problems of rock and soil materials. In order to reveal the dynamic characteristics of the occurrence and development of these geological hazards and to propose c...

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Problems solved by technology

[0004] The purpose of the present invention is to address the current situation of frequent occurrence of rock and soil material flow and slip disasters such as high-speed and long-distance landslides, liquefied soil flow, debris flow, and landfill instability and slippage, and the fact that existing calculation methods cannot simulate large-deformation flow damage. In view of the limitations of the process, a calculation and simulation method for flow-slip catastrophe of rock and soil materials is proposed. Based on the incompressible fluid constitutive and the Cambridge constitutive model of the lower load surface, combined with the solid-liquid complete coupling theory, a solid-liquid two-phase coupling is established. Flow-slip catastrophe calculation model realizes the simulation and reproduction of the whole process of large-deformation flow failure of rock-soil materials

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