裂隙岩体注浆技术在青岛地铁中的应用

Application of the Grouting Technique in a Fractured Rock Mass in the Qingdao Metro

岩体中节理和裂隙形成的涌水通道严重危害地铁运营期安全。文章以青岛地铁13号线井嘉区间段为依托,运用地质雷达对隧道进行全方位探测,明确富水区域、地下水的补给范围和补给方式,并进行针对性注浆作业。一是在渗水区域上端进行环形注浆,封闭上游涌水;二是针对深层围岩裂隙涌水,采用径向群孔注浆,有效防止串浆,提高注浆效率;三是对初期支护背后及浅层裂隙进行充填注浆,切断初期支护背后的水力联系,增强初期支护的抗渗能力。实践结果表明,运用先深层裂隙、后浅层裂隙的系统注浆方法综合治理围岩裂隙涌水,取得了良好的治理效果。

The joints and fissures of a rock mass easily form passages for water inflow and endanger metro con- struction. Based on the Jingjia section of Qingdao Metro Line 13, a water-rich zone, the scope and means of the ground water supply are determined by geological radar detection. Targeted grouting is conducted; that is to say an- nular grouting is carried out at the upper end of the water seepage area to seal the upstream water inflow. Radial grouting to the group holes is adopted to effectively prevent grout leaking and improve grouting efficiency regarding water inflow in fractured rock masses in deep strata, and filled grouting is implemented at the back of the initial sup- port and the area with shallow fractures to cut off the hydraulic connection and improve the impermeability of the pri- mary support. Practice indicates that good results are obtained by systematic grouting, which insures that shallow fis- sure grouting goes after deep fracture grouting in order to control water inflow from surrounding rock.