Study on the Stress Evolution Law of Surrounding Rock in Strong Mining Roadway
In order to solve the problem of instability of surrounding rock in tunnels under strong dynamic pressure,numerical simulation software was used to analyze the disturbed stress and displacement of the auxiliary chute.It was found that when the auxiliary chute was subjected to a single mining operation,the peak stress of the tunnel roof was lower than that of the coal pillar,with a peak stress of 23.19 MPa.Under the influence of a secondary mining operation,the peak stress of the coal pillar reached 27.49 MPa,and the stress concentration of the coal pillar under a secondary mining operation was somewhat expanded compared to that under a primary mining operation.At the same time,the auxiliary transportation channel is affected by secondary mining,and the smaller the distance from the working face,the greater the corresponding displacement deformation.The maximum deformation of the roadway roof,floor,coal pillar support,and solid coal support are 465 mm,101 mm,737 mm,and 216 mm,respectively.The original support scheme was reinforced,and after pressure relief and reinforcement,the peak support pressure was 20.35 MPa,and the peak stress was reduced by 9.43％.
numerical simulationsecondary miningsupport and reinforcementpeak stress
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