Ferris Wheel Series, Flat Top I Event: Project Officers Report - Project 9.1. Grouting Support,

In the Flat Top I event, 20 tons of high explosive, stacked in a spherical shape with the centroid at the ground surface, was detonated at the U. S. Atomic Energy Commissions Neveda Test Site NTS. The primary purpose of this project was to study cratering and ground-shock phenomena of a detonation in hard rock. The U. S. Army Engineer Waterways Experiment Station WES determined pertinent physical properties of the dolomitic limestone and developed grout and concrete mixtures with similar properties, grouted seventeen drill holes and a grout pad, supervised the placing of concrete in major depressions about ground zero, and from field-cast grout and concrete specimens, determined their physical properties on detonation date. Author