TY - GEN
T1 - Micromechanics of deformation in Topopah Spring tuff, Yucca Mountain, Nevada
AU - Wang, Runqi
AU - Kemeny, John M.
PY - 1993
Y1 - 1993
N2 - Samples of Topopah Spring tuff from Yucca Mountain, Nevada have been tested and analyzed. Laboratory tests conducted include standard uniaxial and triaxial compression tests, and special 'damage' tests in which samples are loaded to some proportion of their strength and analyzed with SEM microscopy. Based on the SEM analysis of the damaged samples, the micromechanics of rock deformation and failure in Topopah Spring tuff is determined. The results indicated that pores are the major initial microstructures in Topopah Spring tuff. Also, several mechanisms have been found for microcracking under compressive stresses, including pore crackling, the linking of pore cracks, and the formation of en echelon arrays of axial cracks. The macroscopic cracks tend to propagate in the locations with the highest pore density. The final failure of Topopah Spring tuff is due to shear localization near the peak stress. The microbuckling of crack-induced columns has been found to be the major mechanism for inducing shear localization. The heating of Topopah Spring specimens up to 200°C results in no significant microcracking.
AB - Samples of Topopah Spring tuff from Yucca Mountain, Nevada have been tested and analyzed. Laboratory tests conducted include standard uniaxial and triaxial compression tests, and special 'damage' tests in which samples are loaded to some proportion of their strength and analyzed with SEM microscopy. Based on the SEM analysis of the damaged samples, the micromechanics of rock deformation and failure in Topopah Spring tuff is determined. The results indicated that pores are the major initial microstructures in Topopah Spring tuff. Also, several mechanisms have been found for microcracking under compressive stresses, including pore crackling, the linking of pore cracks, and the formation of en echelon arrays of axial cracks. The macroscopic cracks tend to propagate in the locations with the highest pore density. The final failure of Topopah Spring tuff is due to shear localization near the peak stress. The microbuckling of crack-induced columns has been found to be the major mechanism for inducing shear localization. The heating of Topopah Spring specimens up to 200°C results in no significant microcracking.
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M3 - Conference contribution
AN - SCOPUS:0027206181
SN - 0872629503
T3 - High Level Radioactive Waste Management
SP - 1873
EP - 1879
BT - High Level Radioactive Waste Management
PB - Publ by ASCE
T2 - Proceedings of the 4th Annual International Conference on High Level Radioactive Waste Management
Y2 - 26 April 1993 through 30 April 1993
ER -