近日，南京地铁5号线小天堂站至光华门站盾构区间（以下简称“小光区间”）右线盾构机顺利下穿护城河风险点。
小光区间右线全长为1233.718m，设计环数1028环。其中下穿护城河段长度为128.4m，区间隧道处于3‰的上坡，隧道顶板距离现河床底最小覆土厚度约9.2m，其中隧道主要穿越可硬塑粉质黏土、含卵砾石粉质粘土、泥质粉砂岩等地层，且下穿段位于350m小曲线半径。施工过程中，存在地层上软下硬、小曲线半径施工等难题，可能出现隧道轴线难以纠偏及管片侵限等现象，安全风险和施工难度较大。目前，双线已累计掘进超过千米，根据当前施工进度，小光区间将于2021年底实现双线贯通。
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