关键词: 斜井井筒, 开裂, 受力分析, 治理方案

Abstract: After the axial crack of main and auxiliary inclined shaft vault was found for the first time in Zhujiamao Coal Mine，the cause analysis and the formulation，selection and demonstration of multiple plans for treatment were started.The proposed treatment schemes mainly include ground rotary jet grouting reinforcement，deep mixing pile method and soil pressure curtain grouting method behind the two sides of inclined shaft. By analyzing the stress state of the shaft，it is proposed that the main reason for the axial crack of the shaft arch and its sustainable development is the insufficient horizontal supporting reaction of the left and right side soil layers of the inclined shaft. After demonstration，it is determined that the axial crack section of the shaft arch should be treated by grouting reinforcement of the left and right side soil layers of the shaft to improve the horizontal supporting reaction of the left and right side soil layers of the arch shaft structure，which.Reduces the soil subsidence on both sides of the treatment scheme at the same time .After grouting reinforcement，the soil layer around the shaft will still have plastic deformation，but the deformation rate is very slow. Moreover，during the grouting reinforcement，the stratum is strengthened by compaction， which reduces the width of the vault crack and spinner crack to a certain extent，and strengthens the support of the shaft wall in the cracked section of the shaft，so as to alleviate the risk degree of shaft wall fracture. Up to now，the crack section of the third shaft vault of Zhujiamao Coal Mine is stable，and the crack of the shaft vault has not expanded.

Key words: inclined shaft, crack, force analysis, governance scheme