Accession Number : AD0448434


Title :   STATIC EXPERIMENTS FOR THE STUDY OF THE INTERACTION OF BURIED STRUCTURES WITH GROUND SHOCK WAVES.


Descriptive Note : Final rept., June 60-Apr 61,


Corporate Author : IIT RESEARCH INST CHICAGO IL


Personal Author(s) : Wiedermann, A H


Report Date : Apr 1961


Pagination or Media Count : 12


Abstract : An experimental program was conducted to evaluate and extend some of the basic assumptions and concepts which were used in the soil-structure interaction theory. These experiments were limited to static experiments. The form of the arching force which acts on buried cylinders that are axially loaded was examined. Compacted Ottawa sand was used. The uniaxial compressive loading characteristics of this soil were observed to be almost linear on the loading part of the cycle. However, when unloaded, the material exhibits some hysteresis characteristics. Experiments were performed on a number of buried models which varied in length and stiffness. The soil mass was loaded pneumatically to 20 psi. Indications were that, for the loading part of the cycle, the assumed form of the arching force was very good. The hysteresis characteristics of the soil require that some modifications of the concept be made. Auxiliary experiments were performed on small samples of soil which were confined in a steel cylinder and compressed axially. These experiments indicated that the side wall friction effects were appreciable. Further experiments with various wall treatments, such as the application of teflon sheets, indicated that a large portion of the frictional effect could be eliminated. (Author)


Descriptors :   *UNDERGROUND STRUCTURES , NUCLEAR EXPLOSION DAMAGE , MILITARY ENGINEERING , SHOCK WAVES , EXPLOSION EFFECTS , GUIDED MISSILE SILOS , AIR FORCE RESEARCH , FRICTION , SOILS , TEST METHODS , STRESSES , STRAIN(MECHANICS) , MODEL TESTS , SAND , CANADA , VULNERABILITY


Distribution Statement : APPROVED FOR PUBLIC RELEASE