Hollow inclusion crustal stress telemetry system and method

Abstract

The invention discloses a hollow inclusion crustal stress telemetry system and a method and relates to the technical field of geology, energy, deep mineral products and underground geotechnical engineering reconnaissance survey. The hollow inclusion crustal stress telemetry system comprises a hollow inclusion strainometer and a telemetry master computer. A strain foil, an orientator, a gathering module, a transmitting module and a transmitting antenna are arranged inside the hollow inclusion strainometer which is used for measuring, gathering and transmitting strain and azimuthal angles. The telemetry master computer is composed of a receiving antenna, a receiving module, a signal processing module, a data processing module and a data outputting and displaying module. The telemetry master computer is used for receiving, processing and storing parameter information such as the strain and the azimuthal angles. Through wireless transmission long-distance telemetry, the hollow inclusion crustal stress telemetry system and the method have the advantages that the problems of the redundant wiring process of geostress survey, cable winding, drilling cooling and the like are solved, test efficiency and precision are improved, measuring cost is saved, capacity of resisting disturbance is strong, and instruments are easy and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of geology, energy, deep mineral resources and underground geotechnical engineering survey and survey, and in particular relates to a remote measurement system and method for ground stress of hollow inclusions. Background technique [0002] In-situ stress is the fundamental force that causes deformation and destruction of various underground or open-pit rock and soil excavation projects. It is to determine the mechanical properties of engineering rock mass, analyze the stability of surrounding rock, and realize the scientific design and decision-making of geotechnical engineering excavation and support. necessary prerequisite. [0003] At present, the hollow inclusion stress relief method is widely used at home and abroad, with the most mature technology, the most accurate measurement results, and the most costly geostress measurement method. However, the existing hollow inclusion stress relief method for m...

AI Technical Summary

Problems solved by technology

However, the existing hollow inclusion stress relief method for measuring ground stress has the following problems: (1) During the process of measuring ground stress by the hollow inclusion stress relief method, the wire and cable of the hollow inclusion strain gauge pass through the core pipe and the drill pipe, Finally, when passing through the water supply device at the rear end of the drill pipe to release the casing core stress, the cable is easy to rotate with the core pipe and the drill pipe, and the stress on the cable at the bottom of the enclosure is concentrated, causing the cable to be entangled, the strain gauge of the hollow enclosure to be scrapped, and ground failure. Stress measurement; (2) The water supply at the rear end of the drill pipe cannot supply water to cool the borehole due to the cable passing through, and the temperature makes it difficult to stabilize the reading of the strain gauge; (3) The directional device for positioning the direction of the hollow inclusion strain gauge is bulky and requires wires alone, and The wire is slender and easy to break; (4) The method of centralized measurement is adopted, that is, each measuring point is connected to the static strain gauge by a measurement wire, which requires a large number of measurement wires, which consumes a lot of manpower, material resources and time to carry out the measurement. Transportation and connection work, while too long and too many measurement wires will also affect the reliability of the measurement data, causing a lot of inconvenience to the measurement work

(5) In order to continuously record various data during the stress relief process, it is necessary to pass the wire and cable of the test probe out of the drill pipe and connect it to the recording instrument outside the borehole, which limits the depth of stress relief

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