Fracture mechanics investigation of oil shale to aid in understanding the explosive fragmentation process. Final technical report, January 1983-July 1984

Technical Report · Sat Sep 01 00:00:00 EDT 1984

DOI:https://doi.org/10.2172/5725660· OSTI ID:5725660

Chong, K. P.

This report summarizes goals and findings achieved in developing technologies to improve the overall efficiency of oil shale recovery processes. The objectives are to (a) develop theoretical fracture mechanics tools that are applicable to transversely isotropic materials such as sedimentary rock, more particularly oil shale; and (b) develop a fracture mechanics test procedure that can be conveniently used for rock specimens. Such a test procedure would: utilize the geometry of a typical rock core for the test; require a minimum amount of specimen machining; and provide meaningful, reproducible data that corresponds well to test data obtained from conventional fracture mechanics tests. Critical review of the state-of-the-art of fracture mechanics on layered rocks has been completed. Recommendations are made for innovative and promising methods for oil shale fracture mechanics. Numerical and analytical studies of mixed mode fracture mechanics are investigated. Transversely isotropic properties of oil shale are input using isoparametric finite elements with singular elements at the crack tip. The model is a plate with an edge crack whose angle with the edge varies to study the effect of mixed mode fracture under various conditions. The three-dimensional plate is in tension, and stress, energy methods are used in the fracture analysis. Precracked disks of oil shale cored perpendicular to bedding planes are analyzed numerically. Stress intensity factors are determined by (i) strain energy method, and (ii) elliptic simulation method. 47 refs., 12 figs., 1 tab.

• Research Organization: Wyoming Univ., Laramie (USA). Dept. of Civil Engineering
• DOE Contract Number: AS20-82LC10961
• OSTI ID: 5725660
• Report Number(s): DOE/LC/10961-1705; ON: DE85004985
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
OIL SHALES
EXPLOSIVE FRACTURING
FRACTURE PROPERTIES
DRILL CORES
EXPERIMENTAL DATA
IN-SITU RETORTING
MATHEMATICAL MODELS
ROCK MECHANICS
STRESSES
THEORETICAL DATA
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMMINUTION
DATA
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FRACTURING
FUELS
IN-SITU PROCESSING
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
NUMERICAL DATA
PROCESSING
RETORTING
040401* - Oil Shales & Tar Sands- In Situ Methods
True & Modified
040500 - Oil Shales & Tar Sands- Properties & Composition