GROUTING SUPPORT,
Abstract
In Project HARDHAT, a low-yield nuclear device was detonated underground in granodiorite at the U. S. Atomic Energy Commission's Nevada Test Site. The primary purpose of this project was to develop improved criteria and procedures for design of underground facilities in rock to provide protection against nuclear attack. The U. S. Army Engineer Waterways Experiment Station determined pertinent physical properties of the granodiorite and developed a grout mixture with matching properties; grouted 47 instrument holes and 2 postshot recovery holes; and from specimens of the field-mixed grout, determined its physical properties at shot time. The grout required a high water content to be pumpable; consequently, its compressive strength and ultrasonic pulse velocity were less than desired. However, the density was almost identical with granodiorite and it is believed that the instruments were well embedded in and bonded to the grout, and that the grouting operation was successful in all respects. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 12, 1963
- Accession Number
- AD0423237
Entities
People
- James E. McDonald
- James M. Polatty