Construction Administration Associate Director Evangelia Ieronymaki’s research advances a structural model that may improve ...

The first opeIation in this method of tunneling is to dig two small pilot-tunnels-or so-called side-wall drifts. These drifts are about nine feet square, the roof and sides ueing timbered ...

This is followed by critical descriptions of the various under ground appliances, such as rock-drilling machines, the methods of blasting, haulage, etc. The great develop ment of tunnels during ...