| Abstract |
Mechanical properties of siltstone such as compressive strength and Young's modulus are commonly used in the design of geotechnical structures. This paper highlights the effect of physical properties (i.e., porosity) and environmental conditions (i.e., water content and confining pressure) on the uniaxial and triaxial compressive strength, Young's modulus, and the strength parameters (i.e., cohesion and internal friction angle) of siltstone. A series of uniaxial and triaxial compression tests were conducted on siltstone formations from Wyoming. In addition, experimental data on siltstone from literature were compiled and integrated into this study. Prediction equations for the compressive strength and Young's modulus were established using regression analysis of the data. The results showed that UCS and Young's modulus decreased with the increase in water content and porosity. Also, triaxial compressive strength showed a positive relationship with the normalized confining pressure with respect to the porosity. Finally, the siltstone cohesion decreased with an increase in water content and porosity, while no relationship for the internal friction angle was observed. |
, Lokendra Khatri 
