Reciprocating rock fracture friction-seepage characteristic test device and method

A reciprocating rock fracture friction-seepage characteristic test device, comprising an X-axis shear system, a Y-axis stress loading system, a Z-axis stress loading system, and a servo oil source system, and further comprising a pore pressure loading system and a host (6),

• wherein the X-axis shear system comprises an X-axis EDC controller (10), an upper shear box (11), a lower shear box (12), an X-axis left hydraulic cylinder (13), an X-axis right hydraulic cylinder (14), an X-axis left pressure head (15), an X-axis right pressure head (16), an X-axis left pressure sensor (17), an X-axis right pressure sensor (18), and an X-axis displacement sensor;
• the servo oil source system supplies oil to the X-axis left hydraulic cylinder (13) and the X-axis right hydraulic cylinder (14);
• the lower shear box (12), the X-axis left hydraulic cylinder (13), and the X-axis right hydraulic cylinder (14) are separately fixedly mounted;
• the upper shear box (11) and the lower shear box (12) directly face each other and are parallel to each other to form a cavity that can accommodate a rock specimen (7);
• a left connecting hole is formed in the lower edge of the left side wall of the upper shear box (11) and the upper edge of the left side wall of the lower shear box (12) in a mode of forming gaps oppositely;
• a right connecting hole is formed in the lower edge of the right side wall of the upper shear box (11) and the upper edge of the right side wall of the lower shear box (12) in a mode of forming gaps oppositely;
• the end part of a piston rod of the X-axis left hydraulic cylinder (13) is fixedly connected to the X-axis left pressure head (15);
• the X-axis left pressure head (15) acts on the left side of the upper shear box (11);
• a left shear force is applied to the upper shear box (11) through the X-axis left pressure head (15);
• the X-axis left pressure sensor (17) is mounted at the position where the left shear force can be measured and is electrically connected to the X-axis EDC controller (10) through a signal line;
• the end part of the piston rod of the X-axis right hydraulic cylinder (14) is fixedly connected to the X-axis right pressure head (16);
• the X-axis right pressure head (16) acts on the right side of the upper shear box (11);
• a right shear force is applied to the upper shear box (11) through the X-axis right pressure head (16);
• the X-axis right pressure sensor (18) is mounted at the position where the right shear force can be measured and is electrically connected to the X-axis EDC controller (10) through a signal line;
• the X-axis displacement sensor is mounted at the position where fracture surface sliding displacement formed by shearing can be measured and is electrically connected to the X-axis EDC controller (10) through a signal line;
• the X-axis EDC controller (10) is electrically connected to the host (6), a directional valve (40) used for switching oil supply of the X-axis left hydraulic cylinder and the X-axis right hydraulic cylinder and an X-axis electro-hydraulic servo valve (41) used for regulating the oil flow of oil supply of the X-axis left hydraulic cylinder and the X-axis right hydraulic cylinder in the servo oil source system through signal lines;
• the Y-axis stress loading system can load Y-axis stress on the upper shear box, the lower shear box, and the rock specimen;
• the Z-axis stress loading system can load Z-axis stress on the upper shear box, the lower shear box, and the rock specimen;
• the pore pressure loading system comprises a gas cylinder (50), a pressure gauge (51), a pressure reducing valve (52), a fluid inlet pipeline (53), a fluid outlet pipeline (54), and a flowmeter (55);
• the pressure gauge (51) and the pressure reducing valve (52) are mounted on the fluid inlet pipeline (53);
• one end of the fluid inlet pipeline (53) is inserted into the right connecting hole and can be in contact with the rock specimen (7);
• the other end of the fluid inlet pipeline (53) is connected to the gas cylinder (50);
• the flowmeter (55) is mounted on the fluid outlet pipeline (54) and is electrically connected to the host (6) through a signal line;
• one end of the fluid outlet pipeline (54) is inserted into the left connecting hole and can be in contact with the rock specimen (7);
• the other end of the fluid outlet pipeline (54) is directly connected to the atmosphere.