盾构隧道最小转弯半径是多少？两条盾构隧道间最小间距是多少？
推荐回答（2个）
盾构隧道的最小转弯半径主要与预制管片环宽、楔形量有关，而这两个值预制管片环宽、楔形量与怎个工程线路的线形有关。目前地铁小盾构s=1.2mm，D=6200mm，δ=49.6mm，γ=arctan(δ/D)=arctan(49.6/6200)=0.00799998弧度。s—每环衬砌环中心线长度；θ—拟合曲线转角；γ—每环楔形环的楔形角；δ—每环楔形环的楔形量；D—管片外径。
根据《地铁设计规范》(GB 50157-2003)：正线平面曲线半径在通常情况下≥300m而≤3000m，当相邻坡度差≥2‰设置线，竖曲线半径通常采用3000m和5000m两种。
关于盾构隧道最小间距，常规小盾构是为5.8米（净距），即线间距12米，特殊情况下通过工程处理，可以做到最小1米，目前最近的为2011年天津的某一工程，最小距离做到了900多，但是最后实施结果是失败了，盾构机被埋掉。事后原因分析，主要是施工工程筹划安排有问题。
截止目前施工的盾构最小转弯半径为250m，极限可到200m。但目前盾构设备可以做到30的转弯半径。两条盾构隧道最小间距为2D.
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