7月22日下午，随着一声炮响，隧道内传来阵阵欢呼呐喊声。在历经380多个日夜艰苦卓绝的浴血奋战后，渝昆高铁昭通隧道迎来了进口至1号横洞平导的顺利贯通，极大地鼓舞了全体参建人员的士气。标志着昭通隧道进口至1号、2号横洞 3603米平导段全线贯通。
渝昆高铁昭通隧道采取“2横洞+2斜井+平导”的辅助坑道施工方案，平导全长10028米。这次贯通的平导段长2403米，平导穿越可溶岩地层，地质条件复杂多变，施工安全风险极高。
据悉，昭通隧道进口至1号横洞、2号横洞平导段的全线贯通，标志着又一关键线路施工的如期落地，为下一步进入煤系地层施工提供了巷道式通风条件，同时也打通了进口工区运输生命线。
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