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

Abstract

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.

Description

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AI Technical Summary

Benefits of technology

This patented solution allows for accurate measurements while maintaining stable performance even when there may have problems like rocks cracked or debris falling into holes that can affect measurement results. It uses an elongated tubular body made up of several layers of fibers arranged around it to create a space inside itself where pressure tests occur without being influenced from external influences. By adding extra reinforcement material (fiberglass), this design improves resistance against damage caused by water flow and groundwalls. Overall, these improvements improve the overall effectiveness and applicational range of the proposed method.

Problems solved by technology

This patented describes different types of stress measurements made from rocks (geomechanics) caused by external forces like tunneling movements, exploitation, mineral production processes, and environmental impacts including soil movement, sedimentary basement deformation, and earthquake activity. These techniques have their own advantages over previous ones due to specific physical principles involved. However, they also face challenges related to each technique's limitations.

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