超近距离爆破会对已有隧道造成不利的影响，是亟待解决的工程实际问题。

The blast with a short distance is harmful to an existing tunnel, which is the key problem in the practical projects.

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本文介绍了内昆铁路新杨柳湾隧道超近距离增建施工成功的具体施作方法和经验。

The method of the new Yangliuwan tunnel construction with small distance has been introduced in this paper.

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