Accession Number : ADA295185

Title :   Computational Modeling of Underground Tunnel Response.

Descriptive Note : Technical rept. 10 Aug 90-10 Sep 94,

Corporate Author : TITAN CORP CHATSWORTH CA

Personal Author(s) : Ito, Y. M.

PDF Url : ADA295185

Report Date : 01 JUN 1995

Pagination or Media Count : 32

Abstract : 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)

Descriptors :   *ROCK MECHANICS, *TUNNELS, *EXPLOSION EFFECTS, *UNDERGROUND STRUCTURES, MATHEMATICAL MODELS, VULNERABILITY, MODULUS OF ELASTICITY, EXPLOSIONS, STRENGTH(MECHANICS), LIMESTONE, FAILURE(MECHANICS), SOIL STRUCTURE INTERACTIONS, HIGH EXPLOSIVES, ELASTOPLASTICITY.

Subject Categories : Soil Mechanics
      Structural Engineering and Building Technology
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE