A new constitutive model for fragmentation of rock under dynamic loading

Conference · Fri May 01 00:00:00 EDT 1987

OSTI ID:6527538

Kuszmaul, J S

A constitutive model for rock subjected to blast-induced fracturing is introduced. When the rock experiences tensile loading, microcracking occurs, which degrades the material stiffness. The model includes an effect that occurs at high densities of microcracks: the zones of stress-relieved material around microcracks can overlap. In compression, the rock response is elastic, perfectly plastic. The constitutive model is compared to an earlier model using a simple problem involving loading to failure of a sample of rock under constant strain rate. The new model predicts this failure to be sudden or brittle, as is expected for rocks. The model is also applied to a single-blastwell cratering test in oil shale. The model is used to calculate the extent of fragmentation and the particle sizes of the rubble. The model provides an excellent prediction of the experiment. 16 refs., 6 figs., 3 tabs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6527538
• Report Number(s): SAND-86-2884C; CONF-870867-1; ON: DE87009501
• Resource Relation: Conference: 2. international symposium on rock fragmentation by blasting, Keystone, CO, USA, 23 Aug 1987; Other Information: Paper copy only, copy does not permit microfiche production
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
OIL SHALES
FRAGMENTATION
ROCKS
CHEMICAL EXPLOSIVES
CRATERING EXPLOSIONS
EXPLOSIVE FRACTURING
MATHEMATICAL MODELS
STRAINS
TIME DEPENDENCE
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
COMMINUTION
ENERGY SOURCES
EXPLOSIONS
EXPLOSIVES
FOSSIL FUELS
FRACTURING
FUELS
MATERIALS
040300* - Oil Shales & Tar Sands- Drilling
Fracturing & Mining