Abstract: Thinly layered rocks are widely distributed in mining and underground engineering.Study of deformation and failure mechanism of thinly layered rocks is of great significance to the safe construction and operation of this kind of rock engineering.Using selfdeveloped 3D printing apparatus for geotechnical materials which is based on wetmaterial extrusion deposition molding method,3D printing experiments were conducted for thinly layered rock with different bedding orientations.The rocklike samples with angle θ of 0°,45° and 90° between bedding plane and long axis were obtained successfully.Uniaxial compression tests were conducted,strain field of the samples were monitored using DIC method.The mechanical parameters,evolution of spatial strain field,and failure mode of the printed samples with different bedding orientations were investigated.The results indicate that the printed samples using the proposed method can simulate the mechanical properties and failure mode of the thinly layered rock.Influenced by the relation between bedding orientation and loading direction,significant variation can be induced in the strength and failure mode of different printed samples.Peak strength of the printed samples with θ values of 0°,45° and 90° are 1.88,1.55,3.32 MPa,respectively,the Young′s modulus are 0.37,0.32,0.98 GPa,respectively.Using DIC method,the controlling effects of the relation between the bedding planes and loading directions on the failure process and modes can be better revealed.Research results in this paper can provide knowledge to the application of 3D printing technique in rock mechanics study.

Key words: thinly layered rock,3D printing technique,spatial strain field,bedding orientation,mechanical property