Systematic Cross-Passage Design and Construction Planning for Transit Tunnels

摘要

Long transit tunnels are becoming popular in California's metropolitan areas. Due to their lengths, many cross passages (CP) are required between twin bored tunnels through urban areas in gassy, tar-rich, and seismically active ground. The considerable number of CP, along with varying operating functions, heterogeneous ground conditions (including mixed face) and limited space create a unique design and construction planning challenge. This paper presents a practical, systematic design and planning approach for long tunnels. The paper covers critical aspects of CP design: geological setting, constructability, functionality, system layout and life-safety. This paper discusses key features of the design and construction planning necessary for long transit tunnel CPs, and presents recommendations for an effective CP planning solution including the use of Building Information Modeling (BIM).