Solid-liquid multiphase dynamic numerical simulation method suitable for debris flow

Abstract

The invention relates to a solid-liquid multiphase dynamic numerical simulation method suitable for debris flow, which adopts a numerical simulation model of a solid-liquid multiphase debris flow power process, and comprises the following steps: firstly, acquiring debris flow channel starting, movement and accumulation dynamic information through field scientific investigation and physical and mechanical experiments; Determining high-precision topographic data and object source data in the calculation area through a geographic information system or a high-precision 3D topographic scanner, expressing the high-precision topographic data and the object source data as (x, y, h) grid data through grid coordinate conversion, and respectively representing x, y and h as x, y coordinates and elevation values h of topographic points; Soil and fluid parameters are determined and estimated from a proper amount of soil samples in the channels in the calculation area through indoor physical and mechanical experiments, so that all parameters needing to be prepared in the pretreatment stage of the numerical method are obtained; According to the method, the scientificity and reliability of numerical simulation research in the debris flow dynamic process are improved, the pertinence of disaster prevention and control is improved, the prevention effect is enhanced, and technical support is provided for debris flow disaster reduction.

Description

technical field [0001] The invention relates to the technical fields of mud-rock flow disaster prevention and environmental management, in particular to a dynamic numerical simulation method suitable for mud-rock flow with solid-liquid multiphase. Background technique [0002] Debris flow is a typical solid-liquid two-phase flow with wide solid-phase particle gradation and large bulk density variation range. It is a common geological disaster distributed in mountainous areas. , rapid eruption, ferocious onset, and huge impact, it can not only flow quickly in the ditch, but also rush out of the ditch and enter the river reservoir, causing the water surface to rise and the river to be blocked to form a barrier dam, which seriously threatens water conservancy and hydropower projects. The dam break of Saihu Lake caused a flood disaster in the downstream, endangering the safety of downstream residents and destroying the ecological environment. Moreover, the areas where debris fl...

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Problems solved by technology

[0004] Aiming at the fact that the existing single-phase fluid medium model cannot accurately reflect the dynamic process of debris flow complex multi-phase medium, the present invention provides a simplified fluid density, particle distribution, particle concentration ratio, and force that can replace the single-phase fluid medium equation. Conditions and other defects can accurately couple multiphase media together on the basis of single-phase models, improve the scientificity and reliability of numerical simulation research on debris flow dynamic processes, improve the pertinence of disaster prevention and control, and enhance the prevention effect for debris flow disaster reduction Provide technical support and better serve debris flow disaster reduction Solid-liquid multi-phase dynamic numerical simulation method suitable for debris flow

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