阐述了在松散渣铁层及河岸漂卵石层中快速成孔，形成较大直径的旋喷注浆桩的过程。
The paper describes the building-up process of a large size rotary jet slip-casting pile by quick pore-forming in bulky iron slag layer and in river banks floated pebble bed.
成都地铁一号线一期工程区间隧道大多通过富水砂卵石地层，且含有少量大粒径漂石。
The first stage project of line 1 of Chengdu Metro mostly passes through water-rich sandy cobble ground, which contains a small amount of large boulders.
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