<p>Earth Pressure Balance (EPB) tunneling in mixed ground conditions is a challenging prospect, as it often includes excavation in boulder fields, sections of rock, and/or sticky clay, under high water pressure or changing water pressure. Maintaining a rapid ...

<p>The San Francisco Central Subway project is a challenging modern example of urban tunneling in limited space conditions. This paper discusses the project challenges and solutions at the Central Subway project, with a focus on TBM and continuous conveyor ...

<p>Traffic congestion and environmental factors are creating a demand for greater utilization of underground spaces in urban areas. In mechanized excavation of subway tunnels, the Earth Pressure Balanced Shield (EPBS) has been developed in the recent decades ...

<p>The increased use of underground space for transportation systems and the increasing complexity and constraints of constructing and maintaining above ground transportation infrastructure have prompted the need to develop this technical manual. This FHWA ...

<p>Soft ground tunneling, in urban areas are generally bored using pressurized TBM. Tunnel design involves the need to revalue the classical concepts of deformation response to the excavation and the control priorities, focalized on face and cavity, loose ...

<p>A part of Toulouse&rsquo;s underground line B has been excavated by a 7.8 meters diameter earth-pressure balance machine. A comprehensive monitoring section has been installed in the Compans garden at a point where the tunnel cover is 12.8-meter and is ...

<p>This General Report reviews a total of twenty five papers relating to bored tunnel construction, its influence on ground deformations and tunnel interaction with other geo-structures in the 5th International Symposium on GeotechnicalAspects of Underground ...

<p>The occurrence of occasional sinkholes or very large settlements over EPB driven tunnels has been documented on a number of projects. Primary responsibility for avoiding sinkholes must lie with the tunnelling contractor, and the shield manufacturer. Almost ...