Isotropic collapse load as a function of the macroporosity of volcanic pyroclasts

More complex cases and structures of pores may exist where the grains are in turn formed by micrograin agglomerates which in turn have microvacuolas.

2 ISOTROPIC COLLAPSE LOAD

2.1 Rocks with reticular pore structure

Take a ball of macroporous rock with a reticular pore structure and subject it to an external isotropic pressure, p (Fig. 2a).