By Steve Redmond, Victor Romero

Each years, specialists and practitioners from worldwide assemble on the prestigious quick Excavation and Tunneling convention (RETC) to benefit concerning the most recent advancements in tunneling know-how, and the signature initiatives that support society meet its becoming infrastructure wishes. inside of this authoritative 1608-page e-book, you will find the a hundred and fifteen influential papers that have been offered supplying necessary insights from tasks world wide. you will achieve from the teachings learned--often the difficult way--from huge and significant tasks in tricky floor conditions.

This publication will take you underground for a pragmatic, up-close inspect headline-making tasks from world wide. almost each point of tunneling is tested. it really is an critical source for layout and building engineers and contractors within the large-scale civil tunnel who are looking to remain at the cutting edge in their career.

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Extra resources for 2011 Rapid Excavation and Tunneling Conference Proceedings (Rapid Excavation & Tunneling Conference, Proceeding)

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Electronic edition published 2011. Contracting Practices and Costs Figure 9. Overlay of GCT3 upper level and GCT4 lower level structures and design sections 30 © 2011 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Electronic edition published 2011. East Side Access Manhattan 31 Figure 10. GCT4 bifurcation structures with binocular shape and cross connection UNWEDGE permits limit equilibrium analyses of the wedges formed at the sidewalls and crown of the excavation.

GCT3 Westbound Wye Excavation At the same time as the roadheader was mining out the GCT Eastbound Wye and the Robbins TBM was driving from 63rd Street to 37th Street, the idea of backfilling the first tunnel with concrete and re-driving the TBM through a mixed face of concrete and rock was introduced. After discussions with MTA CC, the GEC and DJ developed the concrete plug concept using pre-bolting from the existing TBM tunnel. The remainder of the second TBM tunnel initial support was installed behind the cutterhead as the TBM mined through the mixed face.

The new arch geometry is suitable for cast-inplace concrete construction using constant geometry formwork. Figure 7 shows the original geometry, while Figure 8 shows the revised geometry. The revised geometry for the various openings called for Geotechnical and Structural coordination for the design of initial support and for the development of loading conditions for final lining design. Because of the complicated geometry, and especially because of the relative position of the GCT3 and GCT4 Interlocking Structures, extensive numerical modeling was performed to evaluate construction sequences, The performance of initial support systems, and interaction between the GCT3 and GCT4 excavations and between those excavations and the overlying construction.

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