Experimental device and method for measuring opening degree of certain point of rock fractur and calibrating osmotic pressure value by utilizing magnetic fluid

Abstract

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.

Description

technical field

[0001] The invention relates to the field of rock fissure experimental devices, in particular to an experimental device and method for measuring the opening of a certain point of a rock fissure and calibrating the seepage pressure value by using a magnetic fluid. Background technique

[0002] Tunnel water leakage is a common disease in built tunnels. Water leakage makes the road surface slippery, threatening driving safety; water leakage increases the humidity in the tunnel; water leakage in cold regions can also cause various freezing injuries, further deteriorating the operating environment of the tunnel. Tunnel water leakage is a prominent problem to be solved in tunnel design, construction and operation. In the process of repairing leaks in tunnels, the first step in repairing leaks is to quickly determine the parts that are most likely to leak first, and to take appropriate measures to remedy them. After determining the best location for leak repair, d...

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