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Planning of the San Francisco Public Utilities Commission's Channel Tunnel

机译:旧金山公用事业委员会英吉利海峡隧道规划

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摘要

The proposed Channel Tunnel is a critical component of the San Francisco Public Utilities Commission's (SFPUC) Central Bayside System Improvements Project (CBSIP), which is a key element of a $6.9-billion sewer system improvement program to upgrade its aging and seismically vulnerable wastewater facilities. The tunnel will provide gravity conveyance and storage of combined sewage flows from the northeast sector of San Francisco, CA to the Southeast Water Pollution Control Plant for treatment. The tunnel will be approximately 2.7 km (1.7 miles) long and 7.3 m (24 ft) in internal diameter. It will utilize a single-pass precast concrete segmental lining system. Tunneling challenges include excavating with pressurized face tunnel boring machine (TBM) technology through highly variable ground conditions including the Franciscan Complex (rock and melange), clayey/silty sands, stiff to hard clay (Old Bay Clay) and mixed-face conditions. The project will also require several deep shafts that will be technically challenging.
机译:拟议的英吉利海峡隧道是旧金山公用事业委员会 (SFPUC) 中央海湾系统改进项目 (CBSIP) 的重要组成部分,该项目是 $69 亿下水道系统改进计划的关键要素,旨在升级其老化和易受地震影响的废水设施。该隧道将提供重力输送和储存从加利福尼亚州旧金山东北部到东南水污染控制厂进行处理的综合污水流。隧道长约2.7公里(1.7英里),内径7.3米(24英尺)。它将采用单通道预制混凝土管片衬砌系统。隧道掘进挑战包括使用加压工作面隧道掘进机 (TBM) 技术在高度可变的地面条件下进行挖掘,包括方济各会复合体(岩石和混合砂)、粘土/粉砂、硬质粘土(旧湾粘土)和混合面条件。该项目还需要几个深井,这在技术上具有挑战性。

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