| ?Tunnel water-inrush in tunnel is a phenomenon that means groundwater in the bottom aquifer breaks mine seam or relatively impermeable layer between aquifers along faults, joints and other structural plane inrush mine suddenly, under the combined effects of factors such as the water pressure and rock pressure, when the mine was exploited Tunnel water-inrush is a induced geological disasters which related with engineering and mining activities. It is engineering geological problems. Large inrush of water is not only flooded mine tunnel , but also can cause collapse and rock unstable, or even result in disastrous results like personal injury and construction scrapped. So it has important guiding significance in improve mine safety and guarantee officers and properties for us selecting scientific method to study the water-inrush changes and movement law in tunnel.I understand the research status in water-inrush from domestic and foreign scholars after reading large amount of literatures. And find that there is a relatively small number scholar to study water-inrush simulation, in which Northeastern University and China University of Mining and Technology are stay on top. They simulate the water-inrush combined the finite element method and FLAC software, the solution is relatively homogeneous. So the paper adapts Lattice Boltzmann Method to simulate tunnel water-inrush, which has a lot of great research result in many fields.We study a two-dimensional tunnel water inrush process at first. The principle of lattice Boltzmann method was introduced by introducing D2Q9 model. In order to improve the reliability and accuracy of simulation, we choose the G2Q9 model is to handle incompressible fluid like water, which was proposed by Guo. We choose different solutions to deal with boundary treatment according different boundary conditions. The bounce-back scheme on a straight boundary and the BFL scheme on a curved boundary were adopted respectively. Because of the complex of tunnel structure, we use separated-coupled algorithm to handle the corresponding boundary in order to reduce computation and improve the efficiency of operations. Finally an example simulation was to verify our theory.Then we simulate two methods that rescue the water inrush and proposed block-style simulation model and emission-style simulation model. For block-style simulation, we established a corresponding inrush block model, using the BFL to process the border. We get the press, speed, flow and other result of tunnel at different time according to the completion of retaining wall. After analysis these results, we think that the results is in line with our expectations. We also established the corresponding drainage model for emission-style simulation and use force to simulate the principles of pumps. And finally the results that instruct the press graph, speed chart ,flow charts and others was got by comparing the two conditions that are under the pressure and stress-free. The results meet our expectation.Finally, in order to understanding about the role that simulate water inrush based on LBM method more clearly, we select D3Q15 model for three-dimensional water inrush simulation which based on the first and second chapters. A simulation case is also verifies our theory at last.How to simplify the complex tunnel, how to select the appropriate Boltzmann models, how to deal with the grid boundaries, how to improve the efficiency of the program, how to get a satisfactory simulation results, all are the focus of the study. This study has also provided the reference and research basis for mine development, comprehensive management and related technology research. |
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