Simulation Study on Static Top Cutting and Pressure Relief Parameters of Expansion Agents
In order to further improve the feasibility of goaf retaining technology,a study was conducted on the method of top cutting pressure relief.Numerical simulation software was used to analyze the static top cutting.It was found that under single hole pressure,there was significant deformation near the drilling wall of the model.As the distance from the drilling wall increased,the deformation decreased,with a maximum deformation of 0.106 mm and a maximum stress value of 125.7 MPa.Under porous pressure,stress concentration is mainly distributed in the double hole connection line and single hole direction of the pressure hole,and a maximum principal stress zone is formed around the double holes.At the same time,the spacing and angle of the top cutting were analyzed,and the optimal borehole spacing was determined to be 0.8 m and the optimal angle to be 65 °,providing reference for the subsequent application of static top cutting technology.
numerical simulationstatic top cuttingcutting angleborehole spacing
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