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.

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。

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By analyzing the mechanical characteristics of the middle-wall, the style of the base of the middle-wall is put forward for the structural stability of the twin-bore connection arch tunnel.

通过对中墙力学特性分析，提出了有利于连拱隧道结构稳定的中墙基底样式。

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