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首页> 外文会议>North American Tunneling Conference 2002, May 18-22, 2002, Seattle, Washington, USA >Predicted and actual risks in construction of the Mercer Street Tunnel
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Predicted and actual risks in construction of the Mercer Street Tunnel

机译：美世街隧道施工中的预测风险和实际风险

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摘要

The Denny Way/Lake Union CSO Control Project includes three short tunnels constructed under active railroad tracks and the Mercer Street Tunnel constructed in a densely populated urban setting. Tunneling was conducted in recent glacial and modern fill deposits. During planning and design, tunneling risks were evaluated. These included groundwater inflow, ground settlement, running sands, boulders, methane, highly plastic silt, railroad ballast, and buried obstructions such as wooden piles, railroad trestles, shoreline sea walls, concrete, and other construction debris. Risk registers were prepared to evaluate the potential severities, ramifications, frequencies, mitigation measures, and expected costs. A Monte Carlo simulation addressed the probabilistic aspects of these risks. These studies led to key decisions incorporated into the project contract documents. During construction of the tunnels, some of the predicted risks were realized and managed. A comparison between the predicted and actual risks has been assembled and is the subject of this paper.
机译：Denny Way / Lake Union CSO控制项目包括在活动铁轨下建造的三条短隧道和在人口稠密的城市环境中建造的Mercer街隧道。在最近的冰川和现代填充矿床中进行了掘进。在规划和设计过程中，对隧道风险进行了评估。其中包括地下水流入，地面沉降，流沙，巨石，甲烷，高塑性淤泥，铁路道ast以及诸如木桩，铁路栈桥，海岸线防波堤，混凝土和其他建筑垃圾等掩埋的障碍物。准备风险登记册以评估潜在的严重程度，后果，发生频率，缓解措施和预期成本。蒙特卡洛模拟解决了这些风险的概率方面。这些研究导致将关键决定纳入了项目合同文件。在隧道施工过程中，已实现并管理了一些预期的风险。已对预期风险和实际风险进行了比较，这是本文的主题。

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