注入泥浆和泡沫的混合液对砂卵石地层进行塑流化改善效果良好。
Injecting the mixing liquid of mud and foam achieves good effects for plastic flow property conditioning of gravel with sand.
北京地下直径线是北京地区首次在砂卵石地层中采用大直径泥水盾构。
The large-diameter slurry shield is the first time to be used in sandy cobble stratum in Beijing Underground Zhijing Line in Beijing area.
在砂卵石地层中勘察钻探时，要解决三个关键性的问题：一是钻进进尺问题；
There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
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.
振动击打：用于松散的砂、卵石、碎石地层的钻进及下套管等。
C. Vibration strike: it is used in drilling and casing with loosen sand, cobble stone and gravel layer etc.
通过实践总结了土钉及锚杆技术在人工填土、砂卵石、砂层、淤泥质土等复杂地层边坡支护施工的处理方法。
The nail-dog and rock-bolt technique is often used in the supporting construction of such complicated slopes as artificial fill, sandy graves strata, sand deposits and muddy soil.
无水砂卵石是一种典型的力学不稳定地层，对盾构存在较大的不良影响。
Waterless sandy cobble is a typical unstable stratum which is unfavorable to shield construction.
砂卵石层是钻进取心困难的地层。
The sand-cobble is often considered as a difficult sampling layer.
砂卵石是一种典型的力学不稳定地层，盾构在此不利条件下安全穿越铁路困难较大。
Gravel is a typically unstable stratum and its mechanical properties is unfavorable to tunnel face stability.
砂卵石是一种典型的力学不稳定地层，盾构在此不利条件下安全穿越铁路困难较大。
Gravel is a typically unstable stratum and its mechanical properties is unfavorable to tunnel face stability.
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