Modeling of rock fracture/rock motion

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5660994

Gorham-Bergeron, E

The principal objective of the Rock Fragmentation Research Program is to develop the capability to predict (with modeling) the characteristics of the retort that determine yield as a function of the blast design and the site properties. The development of modeling as a predictive method was chosen primarily to reduce the cost of evaluating retort designs. It could also result in a more flexible tool than design evaluation by field testing. Presently the rock fragmentation modeling consists of calculating the initial explosive fracturing using the dynamic, finite element code, DYNA2D, coupled with a (subsequent) rock motion calculation using a discrete element code, CAROM. DYNA2D calculates explosive performance in the blastwell, shock wave propagation through the material, and material fracturing and initial movement including blastwell expansion). CAROM uses the velocity field, the blasthole pressure, and the fracture zone predicted by DYNA2D to calculate the subsequent motion of the fractured rock. Key achievements are summarized. A new fracture model has been developed and incorporated into DYNA2D. Fracturing calculations using layered rock, a much more accurate description of oil shale, are now being used and show better predictions of overall degree of fracturing than isotropic calculations. The importance of using cores rather than crater size to determine fracture extent has been demonstrated. Analysis of fragmentation tests SB-1 and SB-2 show good agreement between DYNA2D predictions and experimental measurements for stress wave arrival time and initial magnitude and initial material velocity field. Comparisons between experimental measurements and CAROM predictions of initial material motion show good agreement. CAROM predictions of excavated crater profiles agree well with those measured for SB-1 and SB-2. 11 figs., 3 tabs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5660994
• Report Number(s): SAND-85-1372C; CONF-850761-4; ON: DE85013952
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500* -- Oil Shales & Tar Sands-- Properties & Composition
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BITUMINOUS MATERIALS
C CODES
CARBONACEOUS MATERIALS
COMMINUTION
COMPUTER CODES
COMPUTERIZED SIMULATION
D CODES
DRILL CORES
ENERGY SOURCES
EXPLOSIVE FRACTURING
FAILURES
FOSSIL FUELS
FRACTURE PROPERTIES
FRACTURES
FRACTURING
FUELS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
OIL SHALES
ROCK MECHANICS
SIMULATION
WAVE PROPAGATION