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RESEARCH PAPERS

Calculational Modeling of Explosive Fracture and Permeability Enhancement

[+] Author and Article Information
T. R. Butkovich, D. E. Burton, J. B. Bryan

University of California, Lawrence Livermore Laboratory, Livermore, Calif. 94550

J. Energy Resour. Technol 101(1), 28-33 (Mar 01, 1979) (6 pages) doi:10.1115/1.3446857 History: Received October 30, 1978; Online August 19, 2010

Abstract

With its underground explosion computer codes SOC and TENSOR, the Lawrence Livermore Laboratory is developing a capability for computer code prediction of fracture intensity and permeability enhancement far from a free face. Because the codes calculate fracture and not permeability, one must relate experimental measurements to a calculable parameter for fracture. High-explosive experiments in a coal outcrop and a multiple-charge experiment in a coal seam were designed to provide the needed data. Fracture intensity observed around the explosion centers is shown to be related to a calculated damage parameter εf . This parameter is actually the total failure-induced deviatoric strain. Intrinsic permeability, determined from hydraulic conductivity and calculated from results from slug tests in wells near the explosion, correlates at least qualitatively with the calculated residual tensile-fracture porosity, πf . An important observation is that no tensile failure occurs for some distance from the explosion-formed cavity when spherical charges are employed, whereas, tensile failure occurs near the cavity wall when cylindrical charges are used.

Copyright © 1979 by ASME
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