The invention relates to an experimental device for measuring an opening degree of a certain point of a rock fracture and calibrating an
osmotic pressure value by utilizing a magnetic fluid. The experimental device comprises a bearing plate with a plurality of small holes on the periphery, a plurality of threaded non-magnetic steel rods, a non-magnetic pressurizing
steel bar with holes at two ends, an angle
measuring instrument with a universal rotating spherical hinge and arranged on the bearing plate, a pressurizing
air cushion, a
nitrogen cylinder, a transparent acrylic plate, a pressurizing pump, the magnetic fluid and an
electromagnet. The pressurizing pump is used for pressing water into the cracks of a test
rock sample and a rock-like transparent resin plate, the
water pressure is continuously increased, so that the
water flow impacts the
magnet fluid adsorbed by the
electromagnet until the
water flow breaks through the magnetic fluid to produce leakage, and the magnetic fluid begins producing displacement, thereby obtaining the relation among the magnetic force, the crack opening degree, the
osmotic pressure and the magnetic
fluid viscosity. The experimental device disclosed by the invention cannot be interfered by the
electromagnet, the flowing state of the magnetic fluid can be easily observed, the flowing of the concrete can be well simulated, the
rock sample can reach
visualization, and an effect can be easily observed.