INFILL OF NUCLEAR RUBBLE CHIMNEYS BY GROUND WATER

摘要

This paper presents some of the preliminary results of a theoretical analysis of the ground-water infill rate of a rubble chimney produced by an underground nuclear explosion. The study was conducted to evaluate effects that various features of the hydrogeology regime have on rate of infill. This model for infill is based on the analogy of a rubble chimney to a small diameter gravity well. The infill history is approximated by integrating production from a series of steady state infill rates based on Dupuit-Forscheimer assumptions. The model has been used for parameter sensitivity analysis. Of the aquifer characteristics, changes of the hydraulic conductivity have the greatest effect on infill;the radius of influence is most sensitive to changes in the specific yield. The effect on infill rate using a rubble porosity that decreases with depth is small, although initial infill is more rapid. The hydrogeology data from two events where infill data are available have been used with this model for verification.