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- W4308766044 abstract "To quantify the diffusion range of slurry in grouting engineering, an active heating optical fiber (AHFO) monitoring method is proposed. The AHFO is arranged on the coal seam floor. The temperature is taken as the monitoring parameter to monitor the diffusion range and state of slurry in the injected medium. Considering the time-varying characteristics of slurry rheological parameters, the theoretical calculation formula of spherical diffusion radius based on the power-law fluid is deduced. The relationship between the void ratio and grouting diffusion radius is discussed. Considering the influence of the seepage effect, the water cement ratio change matrix in the process of mud seepage is derived, and the influence of the space-time change of the slurry water cement ratio on the temperature gradient of the injected medium is studied. According to the factors affecting grouting diffusion, four groups of small three-dimensional simulation tests and one large three-dimensional grouting test are designed to verify the feasibility of the proposed method. The results show that the relative error of the AHFO monitoring radius is between 3.00 and 14.67%, based on the actual diffusion radius. In the large-scale three-dimensional grouting test, the data from AHFO is used to generate the two-dimensional surface of the grouting diffusion form, and the grouting diffusion range is asymmetric oval. Compared with the theoretical calculation results, the maximum relative error of grouting diffusion radius is 9.6%, and AHFO shows prediction accuracy. With the decrease in the water-cement ratio of slurry, the temperature gradient of the injection medium monitored by AHFO increases, showing an obvious space-time effect. The application of AHFO in the grouting simulation test can effectively analyze slurry diffusion in the injected medium." @default.
- W4308766044 created "2022-11-15" @default.
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- W4308766044 date "2022-11-10" @default.
- W4308766044 modified "2023-10-01" @default.
- W4308766044 title "Grouting slurry diffusion range based on active heating fiber optics monitoring" @default.
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- W4308766044 doi "https://doi.org/10.1038/s41598-022-22076-5" @default.
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