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淤泥质地层,具有高压缩性、高灵敏度、强度低等特点,易产生蠕动现象,开挖后自稳能力极差。软弱地层暗挖隧道施工,最核心问题是通过注浆改善土层性质,提高土层的承载力和自稳能力。在施工中,采用劈裂注浆,可以改善土层性质,加固土层,使工程取得良好的效果。劈裂注浆既可适应于渗透性较好的砂层,又可适应于渗透性差的粘土层;它是采用高压注浆工艺,将水泥或化学浆液等注入土层以改善土层性质的一种地基加固方法。文章以重庆金童路南段工程火风山隧道工程为例,针对浅埋暗挖隧道的注浆加固施工工法作出探索,可供参考。
Mud texture layer, with high compressibility, high sensitivity, low strength, easy to produce peristalsis, very poor self-stability after excavation. Weak strata undercut tunnel construction, the core issue is to improve the nature of the soil by grouting to improve the bearing capacity and self-stability of the soil. In the construction, the use of split grouting, can improve the nature of soil, soil reinforcement, the project achieved good results. Split grouting can adapt to the permeability of the sand layer can be adapted to poor permeability of the clay layer; it is the use of high-pressure grouting process, the cement or chemical slurry into the soil to improve the nature of a Ground reinforcement method. Taking the project of Huoshan Tunnel in the south section of Chongqing Jin Tong Road as an example, the article makes exploration for the grouting reinforcement construction method of shallow buried tunnel, for reference.