Transport and geotechnical properties of porous media with applications to retorted oil shale. Volume 4. Appendix D. Temperature and toe erosion effects on spent oil shale embankment stability

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5621136

Chang, N Y; Wu, T H

To evaluate the engineering property of spent shale at elevated temperatures, high temperature triaxial cells were designed and manufactured. The cells were then used in the test program designed to provide the physical and engineering properties of spent shale (TOSCO-II) at elevated temperatures. A series of consolidated drained triaxial tests were conducted at high temperatures. Duncan-Chang hyperbolic model was adopted to simulate the laboratory stress versus strain behavior of spent shale at various temperatures. This model provides very good fit to the laboratory stress-strain-volumetric strain characteristics of spent shale at various temperatures. The parameters of this model were then formulated as functions of temperatures and the Duncan-Chang model was implemented in a finite element analysis computer code for predicting the stress-deformation behavior of large spent shale embankments. Modified Bishop method was also used in analyzing the stability of spent shale embankments. The stability of three different spent shale embankments at three different temperatures were investigated in the study. Additionally the stability of embankments with different degrees of toe erosion was also studied. Results of this study indicated that (1) the stress-strain-strength properties of soils are affected by temperature variation; (2) the stress-strain-strength behavior of spent shale can be simulated by Duncan-Chang hyperbolic model, (3) the factor of safety of embankment slope decreases with rising temperatures; (4) the embankment deformation increases with rising temperatures; and (5) the toe erosion induced by floods causes the embankment slope to become less stable. It is strongly recommended, to extend this study to investigate the effect of internal seepage on the stability of large spent shale embankment. 68 refs., 53 figs., 16 tabs.

• Research Organization: Colorado Univ., Denver (USA). Dept. of Civil Engineering
• DOE Contract Number: AC02-83ER60122
• OSTI ID: 5621136
• Report Number(s): DOE/ER/60122-3-Vol.4-App.D; ON: DE86012030
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500 -- Oil Shales & Tar Sands-- Properties & Composition
040900* -- Oil Shales & Tar Sands-- Waste management
AMBIENT TEMPERATURE
COLORADO
COMPRESSION
DATA
DEFORMATION
EROSION
EXPERIMENTAL DATA
FEDERAL REGION VIII
FINITE ELEMENT METHOD
FORECASTING
GROUND DISPOSAL
INFORMATION
MANAGEMENT
MATERIALS TESTING
MATHEMATICAL MODELS
MEASURING METHODS
MECHANICAL PROPERTIES
MECHANICAL TESTS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
NORTH AMERICA
NUMERICAL DATA
NUMERICAL SOLUTION
SLOPE STABILITY
SPENT SHALES
SPOIL BANKS
STABILITY
STRAINS
STRESSES
TEMPERATURE DEPENDENCE
TESTING
USA
WASTE DISPOSAL
WASTE MANAGEMENT