Hydraulic fracturing experiment device and hydraulic fracturing experiment method for columnar coal masses under three-dimensional stress

The invention discloses a hydraulic fracturing experiment device and a hydraulic fracturing experiment method for columnar coal masses under three-dimensional stress. The hydraulic fracturing experiment device comprises a stress loading part and a hydraulic fracturing part; the stress loading part comprises a square steel frame, steel cylinders, arc-shaped steel plates, columnar cushion blocks, high-pressure capsules, high-pressure rubber hoses, digital display stress sensors and hand-operating test pumps, wherein the steel cylinders are connected with the square steel frame, the arc-shaped steel plates are respectively connected with the steel cylinders, and each columnar cushion block and the corresponding high-pressure capsule are located in the corresponding steel cylinders; each columnar cushion block is connected with the corresponding high-pressure capsule, and the high-pressure rubber hoses, the digital display stress sensors and the hand-operating test pumps are respectively connected with the high-pressure capsules; the hydraulic fracturing part comprises a fracturing tube, a fracturing pump, a water tank and a water pressure recorder which penetrate through the steel cylinders and the arc-shaped steel plates in sequence. By adopting the technical scheme provided by the invention, compared with the existing prior art, a hydraulic fracturing experiment on columnar samples under the true three-dimensional stress condition can be realized; the hydraulic fracturing experiment device is simple in structure and easy in operation.