针对平定高速静宁隧道下行线掌子面II级饱和自重湿陷性黄土地层的涌土段及围岩采用“大管棚+小导管超前注浆”预加固工程,对饱和黄土地层劈裂注浆加固的机理进行了分析,对注浆效果、浆体材料及配比进行了现场注浆试验。现场试验表明,采用劈裂法注入水泥水玻璃双液浆加固是可行的。 For the Pingding high-speed Jingning tunnel downstream of the first line of sub-claw face II saturated self-weight collapsible loess formation of the earth and surrounding rock using “large pipe shed + small pipe advance grouting ” pre-reinforcement project, the saturated loess stratum split The mechanism of crack grouting reinforcement was analyzed, and the grouting effect, slurry material and proportioning were grouted on-site. Field tests show that it is feasible to use the splitting method to inject double grouts into cement water glass.