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Effect of seepage velocity on formation of shaft frozen wall in unconsolidated aquifer

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Document pages: 11 pages

Abstract: This paper discusses the problem that it is difficult to close the frozen wall of the mine due to the excessive seepage velocity in the aquifer when the artificial freezing method is used to penetrate the aquifer. Based on the hydro thermal coupling theory and considering the influence of the decrease of absolute porosity on seepage during freezing, a hydro thermal full parameter coupling mathematical model considering phase transformation is established. Taking the shaft as the prototype, the freezing process of the shaft under different formation seepage velocity is numerically simulated by using COMSOL multi physical finite element software. The numerical simulation results are verified by comparing with the field measured data. According to the numerical simulation results, the effects of various groundwater leakage are analyzede velocities on the artificial frozen wall formation process with the seepage-temperature field coupling effect is analysed. Based on the analysis results, the recommended principles of the optimization design for a freezing plan are described as follows: first, the downstream area is closed to enable the water insulation effect, and second, the closure of the upstream area is expedited to reduce the total closure time of a frozen wall.

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