No methods exist worldwide to test major buildings, in-placeand as constructed, to earthquake motion-time histories up to and including damage and collapse levels. testing complete civil structures at significant earthquake levels can provide much needed information for protection against building… More

Hardened, reliable, quick opening/closing closures for the tunnels in a deep base are essential to the survival and operation of the deep base. it is proposed to (1) generate a number of concepts for such closures, (2) screen those concepts on the basis of their operability, simplicity,… More

A deep based system would probably be located below the water table. it would therefore be subject to some water inflow in all phases of construction and operation, although the rate of inflow would be a function of the geologic formation in which the base is sited. the management, control, and… More

Underground excavations in hard rock subject to dynamic loading caused by nuclear detonation may experience violent collapse (rockbursting) similar to what is observed in deep mining operations. this proposal aims at developing a methodology to determine the circumstances for which rockburst will… More