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Borehole pressure relief can effectively reduce the accumulation of elastic energy of working face and surrounding rock mass, and reduce the regional impact risk. But in hard coal seam, drilling jam, holding and other dynamic phenomena often occur in drilling, which seriously reduces drilling efficiency. Therefore, aiming at the problem of poor coa...
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Context 1
... the same time, the analysis of three-dimensional geometric model in discrete element simulation is more idealized, which will not cause disturbance and further affect the simulation results [9][10][11][12] therefore, a single-tool drill is established by using Solidworks software. The simplified model is shown in Figure 2. ...
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