The Regional Connector Transit Corridor project provides a 3.0 km long connection for existing light rail transit lines in downtown Los Angeles, California. The project involves twin bored tunnels, cut-and-cover tunnels, three deep stations and one sequential excavation cavern that will encounter the Fernando Formation bedrock, which underlines the alluvium. The Fernando Formation consists of a poorly bedded to massive clayey siltstone to silty claystone that is poorly cemented and extremely weak to very weak per ISRM (1978). This paper presents the geotechnical engineering characteristics of the formation based on field investigation and laboratory testing.

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