求翻译：本文结合隧道进口段堆积体的施工特点，有效的形成“U”字型帷幕，保证了地表注浆及管棚的施工质量；并考虑地表注浆及管棚施工对围岩的综合效应，对设计进行优化，合理的安排施工顺序，为进洞施工争取了时间。是什么意思？

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