Three-dimensional stress test device for single-hole multi-point hollow fiber grating inclusion in rock mass engineering

The invention relates to a three-dimensional stress test device for a single-hole multi-point hollow fiber grating inclusion in rock mass engineering. The three-dimensional stress test device is mainly composed of two or more unit fiber grating cylindrical hollow inclusion stress gauges, rigid connection rods, centering supports, a wavelength demodulator and a computer. The unit fiber grating cylindrical hollow inclusion stress gauges are composed of epoxy resin hollow inclusion bodies, rigid connection end rings, fibers and gratings. The fibers are fixed into axial grooves, radial grooves and spiral grooves in the outer surfaces of the stress gauges in a wound mode. The test device is installed to a drill hole in a rock mass and coupled with the part, located on a drill hole wall, of the rock mass through slip casting fluid, so that testing of three-dimensional disturbance stress distribution and testing of the time-space evolution law of three-dimensional disturbance stress distribution in the rock mass engineering are achieved. As the fiber grating technology and the hollow inclusion technology are coupled, the test device is resistant to corrosion, groundwater interference and electromagnetic interference and high in test accuracy, has high adaptability to complicated geological and hydrological conditions in the rock mass engineering and can be widely applied to three-dimensional disturbance stress tests for underground tunnels and slope rock masses in water conservancy and hydropower engineering, mine engineering, traffic engineering and the like.