Water and soil coupling landslide simulation method based on high-order double-set double-phase material point method

Abstract

The invention provides a water and soil coupling landslide simulation method based on a high-order double-set double-phase material point method, and the method comprises the steps: employing two setsof material point division to disperse solid soil particles and pore fluid, and employing a regular background grid to realize the solving of a control equation; under a continuous medium mechanicalframework, establishing a solid-liquid two-phase substance point method control equation for dividing two sets of substances; realizing interaction between solid-liquid biphase material points and background grid nodes through a high-order B spline primary function; and based on the basic function of the B spline, updating the acceleration, speed, position and other information of the solid-liquidtwo-phase material point, mapping the calculated node information to the material point, updating the material information of the latest solid-liquid two-phase material point, and finally outputtingsimulation information. The method can accurately simulate the large deformation damage process and the water-soil coupling mechanism of the water-soil coupling soil landslide, and provides data support for disaster assessment and prevention of the water-soil coupling soil landslide problem.

Description

Technical field [0001] The invention relates to geological disaster simulation technology, in particular to a simulation method of a water-soil coupled landslide. Background technique [0002] Landslides are a kind of extremely destructive sudden geological disasters, and they are one of the three major sources of geological disasters. Soil landslides account for more than 60% of landslides of various scales, and they mostly occur in the rainy season. Soil landslides caused by rainfall Widely distributed and large in scale, it has brought huge disaster losses to civil engineering, water conservancy, transportation and mining projects. [0003] At present, the limit equilibrium method or strength reduction method is generally used to study the stability of soil slopes, that is, to analyze the safety factor of the slope and the initial instability slip surface. However, the formation and development of soil landslides is a complicated dynamic process, and its failure mechanism invol...

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Problems solved by technology

However, the traditional material point method only uses a set of material point divisions, which cannot effectively characterize the water-soil coupling effect of rainfall-type landslides; at the same time, because the traditional material point method uses a linear interpolation shape function, the derivative at the grid boundary is discontinuous, so when the material When a point crosses the grid boundary, it will cause a large numerical error, that is, "grid crossing error", resulting in low accuracy of the solution for pore water pressure and effective stress

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