大连华昌变电站电缆隧道出现了严重的底鼓、衬砌裂缝等病害，采用现场测量、钻芯取样等方法对隧道的病害情况进行全面检测，并对病害产生的原因进行分析，认为病害是由地下水作用、原支护结构强度不足和施工质量差等因素综合引起的，决定采用电缆临时移位、底板钻孔注浆后凿除、加设钢筋混凝土内衬的整治方案。目前该工程已竣工，隧道结构稳定，电缆运行正常，取得了较好的整治效果。实践证明： 大连华昌变电站电缆隧道的病害整治方案是可行的。

Floor structure heaving and lining cracks occurred at an operating cable tunnel of Huachang Substation in Dalian, China. These disasters of the cable tunnel are detected by means of site measuring and core drilling; and then the causes of the disasters are analyzed. It is concluded that the groundwater, the insufficient strength of the primary supporting structure and the bad construction quality comprehensively give rise to the tunnel diseases. Countermeasures, such as temporary translocation of the cables, cutting of floor after borehole drilling and the reinforced concrete lining, are taken. The practice shows that the tunnel structure is stable and the cable runs just fine after using the abovementioned measures.