ABSTRACT
Some relevant aspects related to the mechanical behavior of volcanic rocks are considered, mainly based on laboratory tests performed on rocks from the Canary Islands. Ranges of variation of the most relevant geotechnical parameters from the point of view of mechanical behavior and some correlations are given for different types of rocks. More attention is paid to the analysis of pyroclastic rocks, as their mechanical behavior is more peculiar. An empirical yield criterion for low density pyroclasts is adjusted to test results.
