In-situ digital three-dimensional borehole wall strain gauge based on complete temperature compensation technology

A technology of temperature compensation and strain gage, applied in the direction of electric/magnetic solid deformation measurement, measuring devices, instruments, etc., can solve the problems of inability to realize full compensation of temperature influence, inability to achieve long-term measurement, and large temperature change range, etc., to achieve integration The long-term monitoring function of chemicalization and disturbance stress, the effect of increasing the acquisition range and measurement stability, and eliminating the effect of temperature
CN105910531AActive Publication Date: 2016-08-31UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2016-08-31

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Abstract

The invention provides an in-situ digital three-dimensional borehole wall strain gauge based on a complete temperature compensation technology, which belongs to the field of rock mass stress measurement and monitoring. The strain gauge comprises an injection-type hollow inclusion strain gauge skeleton, a high-precision self-compensation strain sensor, a double-earth wire and complete temperature compensation measurement circuit, and a local digital acquisition integrated circuit board, wherein the strain gauge adopts an injection-type design to realize mounting; the self-compensation high-precision strain sensor and the complete temperature compensation circuit eliminate temperature influences in long-term monitoring; the double-earth wire circuit compensates a digital circuit leveling range; and the instantaneous acquisition technology of the digital circuit board eliminates resistor heating influences, thereby realizing long-term effectiveness and relevance of monitored data. The strain gauge has two acquisition modes of a manual power-off continuous acquisition mode and an automatic continuous acquisition mode, short-term and long-term monitoring on the three-dimensional strain of the borehole wall through one-time mounting can be realized, and as multiple wireless connection modes and wireless charging interfaces are preserved, real-time transmission of data from a measurement point to a control room can be realized.
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Description

technical field

[0001] The invention relates to the field of rock mass stress measurement and monitoring, in particular to an in-situ digital three-dimensional hole wall strain gauge based on complete temperature compensation technology. Background technique

[0002] In-situ stress is the natural stress existing in rock mass, and it is the most important factor that determines the excavation, design, and stability analysis of underground engineering. The hollow inclusion strain gauge method for ground stress measurement is a three-dimensional ground stress measurement method recommended by the International Society of Rock Mechanics, and is currently the only ground stress measurement method that can obtain the magnitude and direction of the underground three-dimensional principal stress at one time.

[0003] However, most of the current methods of measuring ground stress with hollow inclusion strain gauges use long wires to lead out the measurement signals, and the resistan...

Claims

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