为了准备建筑的底基和道路需进行挖运土方。

General earthmoving will be done to prepare sub-bases of buildings and roads.

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人工挖孔扩底灌注桩是高层建筑常用的一种桩基础形式，其施工质量的好坏直接影响到建筑的结构安全。

Usually the poured pile by artificial excavation expanding bottom is one foundation pile style of tall building, whose quality can affect the structural safety of the construction directly.

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此外，本文还计算了相当于天然情况各种水深、各种挖深比、各种挖槽底宽下挖槽内的流场。

In addition, the fields of the every kind depth, ratio of dredged depth and bottom width in national condition were calculated in this paper.

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