An experimental device and experimental method for studying rock stress distribution using magnetic fluid
A technology of rock stress and experimental methods, applied in the direction of measuring devices, hydraulic/pneumatic force measurement, material analysis, etc.
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Embodiment 1
[0028] Embodiment 1: as figure 1 Among them, an experimental device for using magnetic fluid to study rock stress distribution, including a pressing device 1, the outlet of the pressing device 1 is connected to the injection pipe 2, the injection pipe 2 is inserted into the borehole 301 of the sample 3, and the injection pipe 2 is connected to the vacuum pump 5 through the suction pipe 4, the injection pipe 2 is provided with a first valve 6, and the suction pipe 4 is provided with a second valve 7.
[0029] Specifically, the pressing device 1 includes an injection cavity 101 , and a piston 102 is arranged in the injection cavity 101 , and the end of the injection cavity 101 away from the injection tube 2 is connected to a pressure pump 103 through a pipeline.
[0030] The pressure pump 103 can be a hand-held or desktop pressure pump. In this embodiment, a desktop pressure pump is preferred, which can ensure the constant pressure of the pushing material.
[0031] The pipeline...
Embodiment 2
[0058] Embodiment 2: Different from Embodiment 1, in step 5, metal powder or magnetic powder is added to the borehole 301. Since the magnetic fluid in the rock pores has magnetism, the metal powder will accumulate on the surface of the hole wall of the rock borehole. Then use a micro-camera to take 3D images of the inside of the borehole to establish a three-dimensional model of the borehole accumulation. The amount of metal powder accumulated on the surface of the hole wall of the rock borehole reflects the amount of magnetic fluid pressed into the rock pores, and then can be used for analysis. The stress distribution of the rock stress is observed in a straight pipe.
[0059] In step 6, after the measurement is completed, the recovery port 1401 of the recovery chamber 14 of the recovery device is attached to the outside of the borehole 301, and the electromagnet 17 is powered on to recover the magnetic fluid and metal powder in the borehole 301.
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