Numerical simulation seepage parameter calibration and time conversion method considering cross-scale grid characteristics

By calibrating the fluid bulk modulus through laboratory experiments and small-scale models, the correspondence between the seepage calculation step and the actual time was established, which solved the problem of unclear seepage time in engineering-scale coal body models and realized the laboratory verification of seepage parameters and the physical interpretation of numerical simulation.

CN122452149APending Publication Date: 2026-07-24INNER MONGOLIA RESEARCH INSTITUTE CHINA UNIVERSITY OF MINING AND TECHNOLOGY (BEIJING) +1
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Patent Information

Application Number
CN202610617297.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-07
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing numerical simulation methods for seepage, the seepage calculation results of engineering-scale coal body models lack a clear meaning of seepage time, making it difficult to correspond with actual engineering time. Furthermore, the selection of seepage parameters depends on experience and lacks verification by laboratory tests.

Method used

Coal sample seepage data were obtained through laboratory water immersion tests. A small-scale model was established, the fluid bulk modulus was calibrated, and the correspondence between the seepage calculation step and the actual time was established through cross-scale grid features. Numerical simulation was performed using FLAC3D software to achieve parameter calibration and time conversion.

Benefits of technology

It improves the physical interpretability of numerical simulation results, realizes laboratory test basis for seepage parameters, solves the problem of seepage parameters relying on experience, and enhances the guiding role of numerical simulation in practical engineering.

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Abstract

The invention relates to a numerical simulation seepage parameter calibration and time conversion method considering cross-scale grid characteristics. Firstly, a coal sample is subjected to a water immersion test in a laboratory; then a small-scale coal sample model consistent with the coal sample in size is established, a clear corresponding relation is established between the seepage time of the laboratory coal sample and the seepage calculation step of the small-scale coal sample model in numerical simulation, and the problems that an engineering scale coal body model is high in calculation scale, the coal body size is huge in actual engineering, and seepage parameters are difficult to comprehensively and actually measure are solved. Afterwards, a conversion relation between seepage characteristic length and cross-scale seepage characteristic time is introduced, a relation is established between the small-scale coal sample model and the engineering-scale coal body model, and through the bridging effect of the small-scale coal sample model, the cross-scale seepage characteristic length and the cross-scale seepage characteristic time are calculated; a clear corresponding relation is established between the seepage time of the laboratory coal sample and the seepage calculation step of the engineering scale coal body model in numerical simulation, so that the corresponding actual seepage time can be inversely calculated according to the existing calculation step result of the engineering scale model.
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