针对工业广场保护煤柱开采导致井筒破损的问题,以大社煤矿为工程背景,分析工广煤柱开采井筒围岩移动变形特征,揭示井筒破损致因;提出工广内后续工作面开采防治井筒破坏方案,形成相应的施工技术,并成功应用工程实践。研究表明:该矿工广内92606工作面邻近副井,开采引发的井筒竖向附加力是井筒破坏的致因;如不提前采取防治措施,后续92606外工作面开采,将导致副井井筒发生二次破坏;研究提出的不停产单卸压槽防治方案,具有不影响矿井生产、卸压率高、施工简单、成本低等优点。采用壁后注浆、开切卸压槽、架设密集井圈等技术,顺利完成了该矿不停产防治副井井筒破损工程。监测表明,该井筒竖向和环向应力,均小于井壁极限.承载力,处于安全状态,运行良好,达到了预期效果。

Aiming at the shaft damage in mine plant coal pillar mining and its control technology, taking Dashe Coal Mine as the engineering background, the movement and deformation characteristics of surrounding rock in the shaft of mine plant coal pillar mining were analyzed to reveal the causes of shaft damage. The scheme for shaft damage control in the follow-up working face of the project was proposed, and the corresponding construction technology was formed and successfully applied. The research shows that the working face under the mine plant region is adjacent to the auxiliary shaft, and the vertical additional force caused by mining has caused the shaft damage; Without taking preventive measures in advance, the subsequent mining of the working face will lead to secondary damage to the auxiliary shaft. The prevention and control scheme of single pressure relief groove without stopping production was proposed, which has the advantages of not affecting the mine production, high pressure relief rate, simple construction, low cost, etc. After grouting behind the lining, cutting the pressure relief groove, and erecting dense crib ring, the auxiliary shaft damage control project was accomplished without stopping production. The monitoring shows the shaft is in a safe state, as the vertical and hoop stresses are within the ultimate bearing capacity of the shaft wall.