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NATM Excavation and Support Design and Construction of the Caldecott Fourth Bore

机译:Natm挖掘和支持设计和建设Caldecott第四孔

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The two-lane, 1,036 m long (3,399 ft) Caldecott Fourth Bore opened to traffic in November 2013 and along with the original three Caldecott bores provides a key transportation link between Alameda and Contra Costa counties. Seven cross passages connect the new Fourth Bore to the existing Third Bore. This paper describes the design of the initial ground support and final lining for the tunnel. The paper also documents the construction of the tunnel, including the daily support selection process, organization of the construction support team, examples of predicted versus observed ground behaviors, contractual considerations regarding support selection criteria, and the management of community impacts.
机译:两条车道,1,036米长(3,399英尺)Caldecott第四次孔口于2013年11月开放到交通,以及原版三个Caldecott Bores提供Alameda和Contra Costa县之间的关键交通连接。七个交叉段落将新的第四孔连接到现有的第三孔。本文介绍了隧道初始接地支撑和最终衬里的设计。本文还记录了隧道的建设,包括每日支持选择过程,建设支持团队的组织,预测与观察到的地面行为的例子,关于支持选择标准的合同考虑,以及社区影响的管理。

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