The San Vicente Pipeline Tunnel Project involves the construction of an 8.5-foot-diameter water pipeline in an 11 mile tunnel in San Diego, California. The tunnel is located in extremely variable geologic conditions of strong granitic and volcanic rocks, weak sedimentary rocks, abrasive conglomerates, and mixed face conditions. One reach of the tunnel is a 5,200-foot mixed face reach that includes Friars Formation Conglomerate overlying granitic rock. Due to the variable ground conditions in this reach, the use of a TBM was deemed too risky and the contract documents required drill-and-blast and hand mining methods. Although it was not required, the contractor elected to construct this reach using NATM methods. This paper describes the geology of the 5,200-foot mixed-face reach, the design evaluation, and the construction challenges faced on this project.
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机译：San Vicente管道隧道项目涉及在加利福尼亚州圣地亚哥的11英里隧道中建造8.5英尺直径的水管。隧道位于强花岗岩和火山岩，弱沉积岩，磨料集团和混合面条条件极具变量的地质条件下。隧道的一个接触范围是5,200英尺的混合面达到，包括Friars形成集团覆盖的花岗岩岩石。由于该覆盖范围的可变地面条件，使用TBM的使用越来越危险，并且合同文件需要钻孔和爆炸和手工采矿方法。 Although it was not required, the contractor elected to construct this reach using NATM methods.本文介绍了该项目5,200英尺的混合面积，设计评价和施工挑战的地质。
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