Simulation method for film formation value of mud of slurry shield machine

Abstract

The invention discloses a simulation method for the film formation value of mud of a slurry shield machine. Through combined usage of a granular distinct element method and a computational fluid dynamic method, a skeleton particle model and a two-phase medium mud model according with Bingham fluid characteristics in skeleton pores are established, and simulation of a film forming experiment of mud is carried out. Meso-structure parameters are obtained through laboratory test, composition of tunnel face skeleton particles is simulated, composition of fine particles in mud is simulated, grouting pressure boundary conditions are applied, value simulation is carried out, and whether a mud film is formed in the tunnel face skeleton particles is determined in a microscopic view. According to the invention, improvement measures can be brought forward to preparation of slurry according to simulation results, so a film forming effect is improved and the method is of guidance meaning to practical engineering.

Description

technical field [0001] The invention relates to a numerical simulation method for mud film formation of a mud-water shield machine, in particular to a numerical simulation method for mud film formation of a mud-water shield machine which combines particle discrete elements and computational fluid dynamics methods, and belongs to fluid-solid coupling analysis technology in geotechnical engineering field. Background technique [0002] With the development of cities along the middle and lower reaches of the Yangtze River across the river, there has been an upsurge in the construction of large-scale cross-river tunnels in my country. Slurry shields are favored for their wide range of applicable geology and high stability of excavation surfaces. The mud-water shield uses pressure mud to support the excavation surface. The formation of mud film is very important for the stability of the excavation surface. Especially in high permeability formations, the mud can easily penetrate th...

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Problems solved by technology

When using finite element or difference method to simulate grouting, it is impossible to describe the relationship between the particle size of fine particles in the mud and the pores of skeleton particles, so it is impossible to simulate the process of mud infiltration or film formation; the simulation of grout is generally assumed to obey Darcy seepage, so then There is a certain difference with the actual flow process of mud

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