Full AspenCat Catalog

Simply describes a variety of tunnels, how they are built and how they are used.

A brief introduction to tunnels--their types, shapes, and parts, and how they are built.

Mechanical ventilation of tunnels is costly because of the initial installation and the continued maintenance and operation. However, at some tunnel length corresponding to a particular altitude, traffic configuration and topography there is a need for this forced ventilation. This study was undertaken to help determine the pollution concentration in existing tunnels in Colorado, and predict the length of tunnels which will need mechanical ventilation....

"Simple text and photographs present the digging of a tunnel, including information on the workers and equipment needed"--Provided by publisher.

CC-V 9/92 12.95 GARRETT

Discusses the history, purpose, and construction of the Chunnel, a railroad tunnel that crosses the English Channel, uniting England and France.

The Twin Tunnels project will add an additional lane of highway capacity and improve roadway geometry for about 3 miles of eastbound I-70 from the East Idaho Springs Interchange (milepost 241) to the base of Floyd Hill (milepost 244) where the project ties into an existing three-lane section. The eastbound bore of the Twin Tunnels will be expanded to accommodate the widened roadway section.

The Twin tunnels project proposes to add a third eastbound travel lane on I-70 between the Idaho Springs East Interchange (milepost 241) to the base of Floyd Hill (milepost 244) where a three-lane highway section currently exists. The project is approximately two and a half miles long and includes widening the eastbound bore of the Twin tunnels.