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.
这些砂卵石层一般具有埋深不大、变形小、承载力高、厚度大的特点。
These sand gravels stratum have the characters of shallow cover, small transform, high bearing capability and big thickness.
在没有良好的持力层（基岩或砂、卵石层）和成熟经验可借鉴的情况下，对第四系土层大直径超长桩（钻孔灌注桩）的承载特性进行了分析。
The bearing characteristic of large diameter and super-long pile in quaternary soil layer is analyzed in the case of no good bearing layer (such as rock, sand and cobble layer) and no ripe experience.
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