Application Research of Expanding Agent Induced Cracking and Roof Cutting in Roadway Retaining Along the Gob
In order to solve the problem of difficult control of surrounding rock deformation caused by the instability of the overlying rock structure along the goaf,this paper uses a combination of numerical simulation and on-site application to study the static top cutting technology of static crushing agents.The top cutting effect under different top cutting angles and heights is studied,and the optimal top cutting height is determined to be 14 m and 70 °.Based on the simulation scheme,application practice is carried out.It was found that the maximum displacement of the top and bottom plates was 79 mm,and the displacement of the two sides was 60 mm.The plan has achieved the expected goal and the deformation of the surrounding rock has been effectively controlled.
numerical simulationapplication practiceretaining tunnels along the goafcutting height
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