Preliminary Study on Size Effect of Fractured Rock Mass with Sand Powder 3D Printing

The size effect has a significant on the mechanical behavior of rock, thereby fundamentally influencing stability rock excavations. main challenge associated with experimental research fractured mass lies in difficulty specimen preparation to represent influence and fracture material. In order preliminarily explore feasibility 3D printing technology field mechanics, specimens different sizes characteristics were produced using sand powder technology. uniaxial compression test was combined digital image correlation method (DIC) study properties deformation failure specimens. finds that: (1) elastoplastic printed are similar soft rock. Specimen angle have effects Under conditions, compressive strength (UCS) Elasticity Modulus should be decreased increase size, influences characteristics. (2) crack initiation position mode various affected by inclination varying degrees. (3) is closely related defect level inside mass. originates from heterogeneity results verify applying masses provide an innovative for study. Preliminary exploration provides powerful reference this field. proves mechanics tests contributes understanding