Study on the Method for Determining the Thickness of Barricade and the Stress Distribution Law Considering the Influence of Boundary Constraints
Unreasonable boundary reinforcement methods can weaken the bending resistance of the barricade edges dur-ing the filling process,thereby affecting the safety of the mining site.Based on this,in order to determine the reasonable thick-ness of the filling barricade and explore the influence of boundary constraints on the stability of the filling barricade,the barri-cade structure is simplified into four types of thin plate models.Based on the first strength criterion,a method for determining the thickness of the filling barricade under different boundary constraint modes is proposed.Combined with the actual engineer-ing situation of Daye Iron Mine,the stress distribution law of the filling barricade under different boundary constraint modes is discussed,and the theoretical model in this paper was validated through analytical geometry and numerical simulation.The re-sult shows that:① The minimum thickness of the barricade is positively correlated with the filling height and the bulk density of the filling slurry,while negatively correlated with the tensile strength of the barricade.Increasing the tensile strength of the barricade is beneficial for its stability.② There is a significant difference in the distribution of tension stress on the inner and outer sides of the barricade,with the outer side in an X-shaped distribution and the inner side in an O-shaped distribution.The weakening of the boundary bending resistance will lead to the expansion of the tension area,and increasing the boundary ben-ding moment of the barricade can effectively prevent the damage of the barricade.③ The stress distribution law obtained from numerical simulation is highly consistent with the analytical geometric analysis results,further verifying the reliability of the method for determining the thickness of filling barricades in this paper.The results can provide reference for optimizing the pa-rameters of barricades in similar mining areas.
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