Rock-soil body discrete element fluid-solid coupling numerical simulation method based on pore density flow

Abstract

The invention discloses a rock-soil body discrete element fluid-solid coupling numerical simulation method based on pore density flow. The method comprises the steps of generating a solid particle random accumulation model, subdividing and identifying a pore network, establishing a pore seepage equation, acting on solids by pore fluid and adjacent solid particles, acting on the pore fluid by solid displacement, and updating pore seepage parameters; repeating the steps until the solid particles are balanced and the seepage of the pore fluid is stable. According to the method, the calculated amount is greatly reduced, the pore fluid state equation is established, the temperature field and the seepage field are naturally coupled through density, the microscopic seepage equation is established by analogy of the macroscopic Darcy law to achieve pore seepage calculation, and the complex macroscopic phenomenon can be efficiently simulated based on the pore scale energy.

Description

technical field [0001] The invention relates to a simulation method of rock-soil body fluid-solid coupling, in particular to a numerical simulation method of rock-soil body discrete element method based on pore density flow. Background technique [0002] Rock and soil is a three-phase complex system composed of solid, liquid and gas. Grouting in geological engineering, oil and gas migration and exploitation in petroleum engineering, water and mud inrush in tunnels, and liquefaction problems are all related to the interaction between fluid and solid. The existence of fluids such as liquid and gas makes the properties of rock and soil have great complexity and variability. It is of great significance to study the migration and interaction of fluids in rock and soil. For a long time, the theory of seepage mechanics and solid mechanics based on macroscopic continuum has been difficult to reveal the microcosmic mechanism of complex macroscopic phenomena. The advantages of defor...

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Problems solved by technology

The former method divides the fluid into discrete fluid units of different densities, and the grid step size is usually an order of magnitude smaller than the particle size. The pressure of fluid units with different densities is different, and the fluid migrates under the action of the pressure difference. Small, this method can simulate very complex fluid phenomena, but the amount of calculation is huge; the latter method considers that the fluid density is constant, and divides the fluid into pore fluid and pore-throat channels, and the fluid migration leads to volume changes, through the bulk modulus Calculate the fluid pressure, the amount of calculation is small, but the method is relatively simplified, and it is impossible to simulate complex fluid phenomena such as turbulence

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