Computational Modeling of Underground Tunnel Response.
Technical rept. 10 Aug 90-10 Sep 94,
TITAN CORP CHATSWORTH CA
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This technical report describes computational modeling of underground tunnel response in support of the Underground Technology Program UTP which is a multi-year investigation into the vulnerability of underground structures. The overall program includes computational modeling, material modeling, laboratory testing, and field testing to improve the ability to predict the response and failure of underground structures subjected to ground shock due to near-surface explosions. The emphasis is on deeply buried tunnels with little or no reinforcement. The computational modeling effort involved three major areas of investigation 1 benchmark activity, 2 parametric study and 3 laboratory test simulation. The benchmark activity was a step-by-step series of idealized problems which addressed various aspects of tunnel response in jointed rock masses. The parametric study considered the systematic sensitivity of loading environment, material characterization and geometric conditions as well as computational approaches on tunnel response. Numerical simulation of the SRI International lab-scale HE experiments on tunnel response in intact limestone was conducted to correlate calculational approaches with data. MM
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