Wireless hollow inclusion strainmeter and method

Abstract

The invention discloses a wireless hollow inclusion strainmeter and a method for measuring ground stress. The wireless hollow inclusion strainmeter for measuring the ground stress is characterized in that a shell body of the wireless hollow inclusion strainmeter is sealed by epoxy resin, a base material of the shell body is composite ceramic, the wireless hollow inclusion strainmeter for measuring the ground stress comprises a strain measurement portion, an emitting portion and a guiding portion, wherein the strain measurement portion, the emitting portion and the guiding portion are all detachable and recyclable, a directional sensor, a power source and an emitting module are sequentially sealed on the rear portion of the wireless hollow inclusion strainmeter, resistance strain rosettes are inlaid in the middle along the same circumference of the wireless hollow inclusion strainmeter at intervals, and the strain measurement portion, the emitting portion and the directional portion of the wireless hollow inclusion strainmeter can be detached and separated. Three groups of strain rosettes and three groups of direction finders are arranged on the wireless hollow inclusion strainmeter. The strain rosettes and the direction finders are used for respectively transmitting collected signals to an amplifier, and then the signals enter an analog to digital (A/D) converter, analog signals are converted into digital signals, a singlechip is used for sampling, and data are sent out through a wireless module. The wireless hollow inclusion strainmeter for measuring the ground stress has integration and telemetering, and can be recovered and repeatedly used.

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 wireless hollow inclusion strain gauge and a method for measuring ground stress. Background technique [0002] At present, the hollow inclusion strain gauge is a kind of measuring device of ground stress which is widely used at home and abroad, has the highest reliability, and is relatively mature. However, the existing hollow inclusion strain gauges have the following problems: (1) During the stress relief process, the wire and cable of the hollow inclusion strain gauge are easy to rotate with the core pipe and drill pipe, resulting in the stress concentration of the cable and being twisted. The inclusion strain gauge was scrapped; (2) The water supply at the rear end of the drill pipe could not provide enough water to cool the borehole due to the cable passing through, which...

AI Technical Summary

Problems solved by technology

However, the existing hollow inclusion strain gauges have the following problems: (1) During the stress relief process, the wire and cable of the hollow inclusion strain gauge are easy to rotate with the core pipe and drill pipe, resulting in the stress concentration of the cable and being twisted. The inclusion strain gauge was scrapped; (2) The water supply at the rear end of the drill pipe could not provide enough water to cool the borehole due to the cable passing through, which made the reading of the strain gauge difficult to stabilize; (3) The directional device for measuring the direction of the hollow inclusion strain gauge was bulky, Wires are required separately, and the wires are slender and easy to break; (4) Too long and too many measurement wires will also affect the reliability of the measurement data and cause a lot of inconvenience to the measurement work

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