A method for simulating a high-speed railway subgrade grouting microscopic mechanism based on fluid particle coupling

Abstract

The invention relates to a method for simulating a high-speed rail subgrade grouting microscopic mechanism based on fluid particle coupling, which comprises the following steps: step S10, establishinga simplified model of a subgrade, dividing grids, and establishing a fluid phase control equation; S20, acting the fluid on the particles, and carrying out stress calculation; Step S30, acting on theparticles, and updating information such as speed and position of the particles according to the Newton's second law: the soil particles are solved by applying the Newton's second law according to the relationship between force and displacement; and S40, inputting the updated particle speed, position and other information into the CFD, and continuing the next step of calculation. According to theinvention, a computational fluid mechanics and particle mechanics coupling calculation mode is introduced into grouting research; in previous studies, a single particle is generally adopted to simulate a soil body, a function is applied to simulate grout, the whole grouting process cannot be accurately simulated, and the method overcomes the defect that the function is used to simulate the grout,and improves the accuracy of numerical simulation grouting.

Description

technical field [0001] The invention relates to the research technical field of roadbed grouting, in particular to a method for simulating the microcosmic mechanism of high-speed railway foundation grouting based on fluid particle coupling. Background technique [0002] The invention relates to the research technical field of roadbed grouting, and belongs to the research application of CFD-DEM coupling simulation on roadbed grouting. [0003] In recent years, grouting technology has been widely used in the field of engineering construction, not only in railway embankment, but also in urban infrastructure, roads, water conservancy and other projects. As grouting technology is more and more widely used in civil engineering However, the theory is far behind the practice. Numerical simulation of grouting can effectively enrich the grouting theory and make it more reliable in engineering practice. [0004] In the previous academic achievements, scholars at home and abroad genera...

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Problems solved by technology

[0004] In the previous academic achievements, scholars at home and abroad generally use PFC particle flow software to simulate the grouting process, and use simple discrete elements to simulate the soil, simplify the interaction between the soil and the grout, and only consider the effect of the grout on the soil. effect instead of taking into account the effect of the soil on the grout, so that the simulation results of grouting are quite different from the actual engineering results

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