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Sinkhole (now filled with concrete) caused by ground loss during Bertha Tunneling
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More Trouble for Bertha TBM, Sinkhole, Tunneling Suspended

January 22, 2016 rockman Project Related Comments Off on More Trouble for Bertha TBM, Sinkhole, Tunneling Suspended

The Bertha TBM creating the Alaska Way Viaduct Replacement Tunnel and the Seattle Tunnel Partners JV just can’t seem to catch a break. After being stopped for nearly 2 years to replace the entire cutterhead […]

DelDOT Indian River Inlet Bridge in late 2007 or early 2008
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Delaware sues geotechnical firm MACTEC for $19.6M

January 30, 2011 rockman Project Related 1

The lawsuit filed in Sussex County Superior Court claims breach of contract by Florida-based Figg Bridge Engineers and its subcontractor, Atlanta-based MACTEC Engineering related to alleged geotechnical engineering errors. It also accuses MACTEC of providing […]

Business centre on Krasnoselskaya. Moscow, Nizhnaya Krasnoselskaya str. Retaining systems-secant piles, sheet-pile, bracing and excavation.
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Unconservative designs with AASHTO LRFD for deep excavations

May 14, 2013 rockman Available Resources Comments Off on Unconservative designs with AASHTO LRFD for deep excavations

Dimitrios at Deep Excavation LLC wrote this article a couple of months ago for his monthly newsletter. He contends that for multi-level braced excavations, the AASHTO LRFD code could produce unconservative results. From his article: […]