台北捷运新庄线丹凤站至辅大站间隧道在完成钻掘工作后，因某建设公司错估隧道与基地建筑线之实际距离，又于施作中正路侧连续壁时发生坍孔，以致在其抢救过程中，造成位于中正路下方之捷运隧道，因灌浆压力挤压使得隧道上方部分环片向内变形。经现场详细检视受损隧道情形，发现于该建物新建工程之基地投影范围内之环数第439至第471环中，除第462环至第470环因变形量超出钢筋之安全负荷需进行环片补强外，另第459环因环片产生之裂缝在行车方向亦需补强。经结构计算后，本案受损环片自第459环至第470环皆采内衬钢环片进行补强，详载整个事件自开始至处理完成之过程，以作为日后类似工程处理之参考。

After the excavation of the tunnel between the FuJen University station and the Danfeng station of Taipei MRT Xinzhuang line, the construction company underestimated the real distance from the tunnel to the structure line of the base and a series mistakes happened on ChungCheng road when constructed. As a result of these factors, the upper segment loop of at the MRT tunnel beneath the ChungCheng road has been out of shape inwards due to the overpressure of grouting during the process of the urgent steps of salvage. Being careful examination of the damage of the tunnel at the site, the 439th to 471st loops have been unearthed under the projection of the newly constructed project. Besides the 462nd loop to the 470th are overdeformed exceeding the safety range of the steel bar and need to be repaired. In addition, the 459th loop needs to be repaired for the fissure in the direction of movement of vehicles. Under the calculation of the structural mechanics, the damaged loops for the 459th to the 470th are need to be repaired by the means of lining the copper loops. This article reports the process of repairing the deformed tunnels form beginning to end to be a reference of the relevant work projects afterwards.