1月20日，随着“大连4号”盾构机顺利出洞，大连地铁5号线甘井子站至山花街站区间双线顺利贯通。
甘山区间以甘井子站为起点，沿甘井子街由南向北敷设，下穿甘北路后，到达山花街站。区间左线隧道长度678.180米，右线隧道长度668.118米，覆土深度9.28米~12.69米。
在施工过程中，地铁建设者们克服了地层软硬不均、地质夹层不良参数、刀盘刀具螺旋机磨损等掘进困难，成功穿越工业管线密集区、商业房屋、排水暗渠等一级风险源，实现了提前双线贯通。
面对今年的新冠疫情，地铁五号线项目公司在确保人员防疫安全的前提下，持续推进盾构掘进，严把安全质量关，实现了安全质量零事故，为甘山盾构区间双线贯通打下了坚实基础。
甘山区间是大连地铁5号线第9个双线贯通的区间，截至目前，全线土建工程已完成72%。
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