Numerical Simulation of Pressure Relief Evolution Characteris-tics in Strong Mining Roadway
The pressure relief of the strong mining roadway is a commonly used roadway protection measure.This article takes the roof cutting of the goaf retaining roadway in a certain mine as the engineering background,and uses Flac 3D software to es-tablish a simulation model of the roof cutting pressure relief of the goaf retaining roadway.The pressure relief effect of the strong mining roadway under different roof cutting heights and cantilever lengths formed after roof cutting is studied.Research has shown that the stress of the surrounding rock on the side of the goaf near the goaf is less affected by the goaf,and a phenom-enon similar to the"leverage effect"may occur;The pressure relief effect of top cutting is significantly linearly related to the top cutting height,with a top cutting height of 3 meters being the optimal top cutting height;The relationship between the pres-sure relief effect and the length of the cantilever is complex,and it is compressed and filled by the deformation of the goaf roof.
mining roadwaypressure reliefleft alley along the goaf
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