日前，杭州天目山项目南线盾构“使命号”成功穿越地铁2号线。至此，天目山项目双线盾构成功下穿地铁2号线，攻克了项目盾构段重大风险源。
天目山项目隧道段采用两台直径13.46米泥水盾构施工，掘进过程中需下穿既有运营的地铁二号线，其中北线距离地铁二号线仅3.5米，南线距离地铁二号线仅3.1米，地铁二号线所处地层为淤泥质黏土等流塑状高压缩性土，隧道底部存在部分中风化晶屑玻屑凝灰岩基岩凸起，且大直径盾构在复杂地层中小净距下穿地铁运营线无经验可循，施工难度极大。
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