A Mathematical Model for Calculating the “Brittleness-Ductility” Drop Coefficient of Sandstone in Mining Zones

Figure 2

MTS816 test system. (1) Hydraulic control system. (2) Triaxial experimental platform. (3) Control cabinet. (4) Data acquisition system. (5) Hydraulic oil. (6) Confining pressure cavity. (7) Positioning rod. (8) Sensor interface. (9) Loading device. (10) Specimen. (11) Ring extensometer.