FEM analysis on stability of shaft frozen wall in rich water sandstone

摘要

Based on the theory of three-dimensional elastic-plastic seepage, the prediction of sandstone displacement and stress distribution law of the shaft frozen wall in Xiaozhuang Coal Mine was calculated.The prediction of sandstone displacement of frozen wall is performed by FEM numerical calculation.The results indicate that the biggest radial displacement was 2.036 × 10-3 m when the thickness of frozen wall and roadway height were 2.5 m and 4 m, respectively, which could meet the requirements of safety regulations that the radial displacement should not exceed 50 mm and would not cause damage to the frozen pipe.The result showed that the design of frozen wall thickness and roadway height was proper, which can ensure the construction smooth.The actual monitoring data were basically consistent with predictive value.The study shows that FEM calculation could well predicate the radial displacement of frozen wall, and it is a quilt effective way of research to predicate stability of surrounding rock.