Numerical Simulation Study on the Effects of Joint Support in Mining Structures Using FLAC3D
To investigate the stability of the bottom mining structure under complex geological conditions,taking an example of high ground stress and soft,fractured orebody mining,theoretical analysis and numerical modeling methods were used to construct a numerical model of a typical-sized stope.The impact of stress unloading during mining on the bottom structure and the changes in stability of the bottom support structure during the mining process were analyzed.Research indicates that as mining progresses,stress redistribution gradually shifts towards the bottom structure,with maximum principal stresses reaching 17 MPa along the ore extraction drives.The combined support scheme significantly improves the stress distribution around the tunnel,making the stress distribution within the stope bottom structure more uniform.During different steps of stope mining,stress distribution changes due to stress release,and control measures for stress release in the middle of the tunnel and roof support near the bottoming entry should be strengthened.The findings can provide a reference for optimizing stope structural parameters and support scheme designs in mines using similar mining methods.
Numerical simulationBottom mining structureStability analysisJoint support
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