Rock stratum grouting water blocking test device and method under mining coupling condition

A rock stratum grouting water blocking test device under a mining coupling condition, comprising a solution box, a test box, a pressing plate replacement box, a grouting pump, a recovery pool and a water pump, wherein the solution box is connected with the test box through a liquid injection pipe, the bottom of the test box is connected with the pressing plate replacement box, the pressing plate replacement box is connected with a bottom plate, and the bottom plate is connected with a control panel;

• longitudinal pressing plates, a transverse pressing plate, and a temperature sensor, a weight sensor and a stress sensor are provided inside the test box;
• the longitudinal pressing plate at the bottom of the test box is provided with fracture and scales, a top of the test box is provided with a cover plate, and the cover plate is provided with a plurality of liquid injection holes, one or more of liquid injection holes are connected with the solution box through the liquid injection pipe;
• a left side panel of the test box is provided with a water drain hole and a plurality of grouting holes, and a right side panel is provided with a plurality of water injection holes, and the water injection holes are connected with the water pump through a water injection pipe;
• the water drain hole is connected with a recovery pool through a water drain pipe, and one or more of grouting holes are connected with the grouting pump through a grouting pipe;
• a pressure gauge is installed on the grouting pipe, each of the water drain pipe and the water injection pipe is provided with a water pressure gauge and a flow meter;
• each of the liquid injection pipe, the grouting pipe, the water drain pipe, and the water injection pipe is provided with a valve;
• the longitudinal pressing plate is provided with a plurality of opening holes, and the positions of the opening holes are opposite to the positions of the liquid injection holes in the cover plate;
• the middle of the cover plate is provided with a hydraulic prop which connects the cover plate with the longitudinal pressing plate;
• and
• the longitudinal pressing plate is rotated by means of a roller, a width of the fracture is adjusted to be 1-3.5 mm, an angle of the fracture is adjusted to be 0°-50°, and a roughness factor of the fracture is adjusted to be JRC=8-10, 14-16, 18-20.