A strain beam type two-dimensional borehole stress meter capable of measuring in-situ stress of borehole inner wall

By designing a strain beam type two-dimensional borehole stress gauge, and adopting a cross-shaped strain beam and a micro hydraulic cylinder structure, the problems of single measurement direction and limited data acquisition in existing borehole stress gauges have been solved, realizing flexible and efficient two-dimensional original rock stress measurement and voltage signal output.

CN117309198BActive Publication Date: 2026-06-02SHANDONG KEYUE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG KEYUE TECH CO LTD
Filing Date
2023-09-22
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing borehole stress gauges can only measure the stress of the original rock on the borehole wall in a single direction, and the data acquisition method is limited, making it impossible to measure the stress of the original rock in both the vertical and horizontal directions at the same time, and they cannot output voltage signals.

Method used

A strain beam type two-dimensional borehole stress gauge is designed, which adopts two pairs of strain beams arranged in a "+" shape. The strain beams are supported by a micro hydraulic cylinder and the voltage signal is output by the strain gauge. Combined with a wedge-shaped brake block, it maintains stability, replacing the traditional oil bladder device.

Benefits of technology

It enables simultaneous measurement of the original rock stress in both the vertical and horizontal directions of the borehole inner wall, with flexible and efficient data acquisition, convenient output voltage signal, and good positional stability.

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Abstract

The present application relates to a kind of strain beam type two-dimensional borehole stress gauges capable of measuring the stress of borehole wall, belonging to the technical field of borehole stress measurement.The borehole stress gauge includes a measuring unit and a power unit, the measuring unit includes two pairs of strain beams and a support mechanism, the two pairs of strain beams are arranged in a "cross" shape on the support mechanism, and the strain beams are used to receive the stress changes of borehole wall, the power unit is connected to one end of the support mechanism of the measuring unit, and provides power to lift the two pairs of strain beams along the radial direction of the support mechanism.The strain beam type two-dimensional borehole stress gauge designed by the present application has high measurement accuracy, good stability and convenient application.
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