PREDICTION OF GEOTECHNICAL PROPERTIES OF COAL SLURRIES USING CONE PENETRATION TEST
Open Access
- Author:
- Zhao, Rong
- Graduate Program:
- Civil Engineering
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- April 12, 2019
- Committee Members:
- Ming Xiao, Thesis Advisor/Co-Advisor
- Keywords:
- Coal slurry
liquefaction
correlated shear modulus
preconsolidation
soil classification - Abstract:
- This thesis presents an experimental research for studying liquefaction potential of coal slurry under seismic motions by cone penetration test and correlations of coal slurry physical and dynamic properties such as shear modulus, pre-consolidation stress, and soil classification. Total of eight cone penetration tests are performed, six before simulated earthquake shaking and two after shaking. Tip resistance, sleeve friction and pore pressure of coal slurry are collected during CPT and used to analyze coal slurry. Friction ratio, as one of the basic parameters of coal slurry, is calculated directly from tip and sleeve resistance. The ratio of cyclic resistance ratio and cyclic stress ratio is used to evaluate liquefaction potential of coal slurry. CPT at different locations in laminar shear box yield varying cyclic resistance ratio based on the tip resistance. Three soil properties of coal slurry are correlated with CPT as the main findings of this research. Shear modulus and shear wave velocity of dried coal slurry are measured from resonant column test and compared with shear modulus correlated from CPT. Pre-consolidation stress of coal slurry is measured from oedometer test of in-situ undisturbed coal slurry samples and compared to the correlated pre-consolidation stress derived from CPT. Soil classification is determined by lab testing such as sieve analysis, hydrometer test, and Atterberg limit test and also compared to the correlated soil classification from CPT. The coal slurry is anticipated to liquefy with an arbitrary ground acceleration estimated based on cyclic resistance ratio. The shear modulus of coal slurry measured from resonant column test is less than correlated shear modulus from CPT results, but in an acceptable range. The correlated pre-consolidation stress from CPT is close to the pre-consolidation stress measured from oedometer test. The correlated soil classification from CPT also agrees with the classification based on laboratory testing.