黄金隧道塌方冒顶结构计算及特殊设计

赣(州)韶(关)铁路黄金隧道,因地理位置特殊、地质条件复杂,偏压、富水、溶洞发育,施工难度大。针对隧道埋深70 m,却发生了塌方、冒顶,根据工程类比、结构计算及经济比选后,确定对塌方冒顶段的处理措施。通过对塌方邻近段及坍塌体采用围岩注浆加固、超前管棚注浆、超前小导管注浆、双层初期支护、环形开挖预留核心土法等支护措施,对地表陷坑进行处理,并结合超前地质预报、监控量测等手段,成功通过了塌方冒顶段。

Structure Calculation and Special Design for Collapse and Cave-in Treatment of Huangjin Tunnel

As for Huangjin Tunnel on Ganzhou-Shaoguan Railway,because of its unique geographical position and the complex geological condition,as well as because of the adverse situations such as eccentric pressure,water-rich and karst development,the construction for it was difficult.Aiming at the collapse and cave-in of the tunnel with a burial depth of 70 meters,the treatment measures were determined after engineering analogy,structure calculation and economic comparison.Afterwards the relevant supporting measures were employed,such as consolidating the collapse body and cave-in body and its adjacent area by surrounding rock grouting,advance shed-pipe grouting,advance small duct grouting,double-deck primary supporting,annular excavation with preserved core soil and so on.And the ground surface subsidence was also treated.By using above treatment measures and in combination with geological forecast and monitoring methods,the collapse and cave-in areas have successfully been passed through.