超前小导管:小导管注浆适用于拱顶薄层松软带,断层破碎带,有地下水影响的地址不稳定,易于塌落掉块的IV,V级围岩隧道段,它常同台阶法施工配合使用。
Advanced small pipe: Small cathetre pre-injection slurry is suitable for the vault,the fault fracture zone,the address of groundwater influence is unstable,and the LV and V rock tunnel sections that are prone to collapse and fall,and it is used for the constryction of the same stage method.
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