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砂卵石地层具有结构松散、孔隙率大、易坍塌等特点,在盾构掘进过程中自稳能力极差,故在盾构始发前、接收前均采用超前注浆加固措施,通过合理选择注浆材料和浆液的配比、注浆压力、注浆范围等,以达到加固地层保证盾构掘进顺利进行的目的。
The sand-gravel stratum has the characteristics of loose structure, large porosity and easy collapsibility. Because of its poor self-stability during the shield tunneling process, the advanced grouting reinforcement measures before shield tunneling are adopted, Pulp material and slurry ratio, grouting pressure, grouting range, etc., in order to achieve the purpose of strengthening the stratum to ensure smooth progress of shield tunneling.