Cylindrical In-Situ Tests at Selected Nuclear and High-Explosive Test Sites
Abstract
The development of high confidence ground shock prediction techniques using computer simulation of nuclear bursts over or in real geologic materials is essential for adequate design and evaluation of present and future hardened land based systems. In the past, the calculational technique developed and used in these studies has relied upon material constitutive models developed from laboratory tests of material samples. Crucial to the success of this theoretical ground shock prediction program is a clear verification of the ability of the soil modeling and calculational technique to accurately reproduce ground motions generated by scaled high explosive (HE) detonations in geologies of direct interest to DOD systems. Substantial discrepancies between calculated and observed ground motions have been noted. These are attributable primarily to inadequacies in the laboratory-based soil and rock material models. To overcome some of the shortcomings of the laboratory-based modeling techniques, an in situ material property test has been developed by the Air Force Weapons Laboratory (AFWL). The Cylindrical In Situ Test (CIST) technique permits measurement of the dynamic response of geological materials to a cylindrically symmetric high explosive shock input yielding data from which in situ material properties may be determined for a range of initial loading stresses. Models based on CIST data have resulted in substantially improved agreement between calculated and observed data. Data from CIST 2 conducted in 1972, CIST 10 conducted in 1974, CIST 15 conducted in 1975, and CIST 16 conducted in 1976 are included in this report.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1977
- Accession Number
- ADB017323
Entities
Organizations
- Air Force Research Laboratory