基于注浆修复的地铁隧道结构穿孔风险评估与应急修复方案研究

Risk Assessment and Emergency Repair Scheme of Subway Tunnel Perforation Based on Grouting Repair

轨道交通隧道受外部施工作业影响导致被击穿的情况越来越多,需明确各类修补措施的优缺点并提出改进方案,建立标准化处理措施,确保既有线安全运营。此次隧道穿孔事故采用了地面深孔注浆+洞内注浆进行围岩加固,使用新型材料改性MPC特种水泥和高强防水涂料恢复隧道结构。使用三维成像和雷达,分别对隧道修复结构和地层进行检测,在结构内部未发现明显缺陷,钢筋清晰可见,地层也未见明显反射,剖面较均匀,岩土体已经密实,修补效果较好。最终得出,隧道中心线两侧30°~50°范围为内侧拉压转换区域,一般短期内隧道自身稳定性可以得到保障,但长期来看则会对衬砌结构耐久性产生严重影响;地面注浆+洞内注浆结合的修复方案,工期短,对周边环境影响较小,对运营影响较小;对于传统材料而言,新型材料在隧道穿孔事故中更具有实用性。

There are more and more cases of rail transit tunnels being broken down due to the influence of external construction operations,it is necessary to clarify the advantages and disadvantages of various repair measures and put forward improvement plans,establish standardized treatment measures,and ensure the safe operation of existing lines.In this tunnel perforation accident,the ground deep hole grouting+cave grouting was used to strengthen the surrounding rock,and the new material modified MPC special cement and high-strength waterproof paint were used to restore the tunnel structure.Three-dimensional imaging and radar were used to detect the tunnel repair structure and the formation,respectively,no obvious defects were found inside the structure,the steel bars were clearly visible,and the formation did not see obvious reflection,the profile was relatively uniform,and the rock and soil body was dense,and the repair effect was good.Finally,it is concluded that the 30°~50°range on both sides of the tunnel center line is the inner tension and pressure conversion area,generally,the stability of the tunnel itself can be guaranteed in the short term,but in the long term,it will have a serious impact on the durability of the lining structure;the restoration scheme combining ground grouting and cave grouting has a short construction period,less impact on the surrounding environment and less impact on operation;for traditional materials,the new materials are more practical in tunnel perforation accidents.