Abstract
In this paper, according to the migration and diffusion law of MICP solution in fracture-pore medium, the migration and diffusion equation of MICP solution in loess fracture-pore medium is derived at first. Then, the migration and diffusion test was carried out by using the self-made MICP solution migration and diffusion device. In the model, the aperture of the fracture of 0.5mm, 1.0mm and 1.5mm was selected, and the calcium ion concentration at different points was measured by atomic absorption method, so as to obtain the distribution map of calcium ion concentration. According to the test results, the migration speed of calcium ions in the direction along the fracture is less than the diffusion speed of the wet peak, and the vertical fracture direction is faster than the diffusion speed of the wet peak. The distribution range of calcium ion concentration increases first and then decreases with the increase of fracture opening. COMSOL software is used to compile the mathematical equation, and the whole process of MICP solution migration and diffusion is numerically simulated. The numerical calculation results are basically consistent with the experimental results, and the derived mathematical equation is reasonable.
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