Calculational modeling of explosive fracture and permeability enhancement

Conference · Thu Mar 01 04:00:00 EST 1979 · J. Energy Resour. Technol.; (United States)

OSTI ID:6050442

Butkovich, T R; Burton, D E; Bryan, J B

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 epsilon/sub f/. 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, ..pi../sub f/. 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. 16 references, 8 figures.

• Research Organization: Lawrence Livermore National Lab., CA
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6050442
• Conference Information: Journal Name: J. Energy Resour. Technol.; (United States) Journal Volume: 101:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
COAL DEPOSITS
COAL MINING
COAL SEAMS
COMMINUTION
COMPUTER CODES
EXPLOSIONS
EXPLOSIVE FRACTURING
FAILURES
FORECASTING
FRACTURES
FRACTURING
GEOLOGIC DEPOSITS
LAWRENCE LIVERMORE LABORATORY
MATHEMATICAL MODELS
MINERAL RESOURCES
MINING
NATIONAL ORGANIZATIONS
PERMEABILITY
RESOURCES
S CODES
T CODES
UNDERGROUND EXPLOSIONS
US AEC
US DOE
US ERDA
US ORGANIZATIONS