283 Figure 2 - The structure diagram of the inserted tooth penetration crushing test equipment (high-pressure): a, physical diagram; b, structural diagram; c, test system This equipment enables rock indentation experiments under high-stress conditions. An indentation force is transmitted to the base through a drive rod. The base is designed with adapter sockets that allow for the replacement of inserts with different geometries, as shown in Figure 3. To investigate the influence of multiple inserts with different shapes on rock failure, spherical inserts and conical inserts, both with a diameter of 5 mm, were designed. Figure 3 - The structure of double-inserted tooth: a, spherical-spherical dual inserts; b, conical-conical dual inserts 2.2 3D Profilometer To accurately obtain the morphology of the fracture craters and differences in breakage angles, a KEYENCE VR-5000 series 3D profilometer was used in this study to scan the specimen surface, as shown in Figure 4. Figure 4 - KEYENCE VR-5000 series 3D profile scanner Drive Screws Stepper motors Reducer Limiters Anti-Force Frame Displacement Sensors Load sensors Flange Confining pressure vent Pressure barrel Inserted tooth Collar Rock samples Axial pressure piston Confining pressure inlet Axial pressure inlet Pedestals (a) (b) Drive Mechanism Rock sample loading and pressurizing device Anti-Force Frame 5mm 5mm Spherical tooth Conical tooth 139kPa 139kPa Pressure volume controller Digital Controller Control Software Data Line High Pressure Hose Pressure volume controller Digital Controller (c) Confining pressure Axial pressure Scanning Software Controller Specimen Stage High-Resolution CMOS Sensor
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