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Technical Papers

elizabeth river tunnel NFPA-502 Fire Protection Case Histories: Elizabeth River Tunnel and the Hugh L. Carey Tunnel
TBM News
September 18, 2018
Read Article
Featured Stories Access shaft for Bertha’s rescue
Groundwater: For Tunneling, It’s All about Control
August 16, 2017
Ventilation
Case Study on Retrofitting
March 1, 2017
News
Tunnel Segment Gaskets: Cast vs. Non-cast
December 12, 2016
News
Choosing the Right Pump or Gunite Machine
December 5, 2016
Technical Papers Permeation Grouting
Ground Improvement for Groundwater Control

Whether the need for ground improvement is known in advance or unexpected, the techniques available are the same. Howeve...

July 25, 2016
Featured Stories
Tunnel Shaft Dewatering Dealing with Stratified Soils Below the Water...

Advancing a tunnel shaft is akin to an archeological dig. The process is relatively slow with the support structure adva...

June 22, 2016
Featured Stories
Cement Grout vs. Chemical Grout: Which One to Use, When,...

Used on a myriad of new and rehabilitation construction projects, cementitious and chemical grouts share a common catego...

June 8, 2016
Featured Stories Grouts and gels
Cement Grout vs. Chemical Grout: Which One to Use, When,...

By Britt N. Babcock, P.E.   Used on a myriad of new and rehabilitation construction projects, cementitious and chem...

May 26, 2016
Featured Stories An advantage of the guided boring method is that it can be used in small jacking and receiving shafts.
Microtunneling or Guided Boring?

How to choose the most appropriate method for your project The debate regarding what method of mining to select for infr...

December 14, 2015
Featured Stories
Cellular Concrete: A Cushion Over A Fault Line

As engineers continue to understand cellular concrete and its variety of material properties, this material continues to...

August 25, 2015
Technical Papers 170 Feet Below Columbus
170 Feet Below Columbus

By Lucian P. Spiteri, P.E., Paul C. Schmall, Ph.D., P.E., Mark Gentile, P.E., and Michael A. Nuhfer, P.E. The OSIS Augme...

August 25, 2014
Featured Stories San Fransisco Central Subway Project
Innovations in Precast Concrete Segmental Linings: Case Studies from Around...

Since their introduction, precast concrete segmental linings have continued to develop and evolve.  In this article...

February 17, 2014
Technical Papers
Cellular Concrete: Filling the Void

Despite the fact that cellular concrete has been in the construction industry for nearly a century, it is not uncommon f...

March 28, 2013
Technical Papers
Specifying Microtunneling Installation Tolerances

Microtunneling has been used in the United States since the mid-1980s as a means of trenchless pipe installation. In the...

January 27, 2013
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