Deep rock mass three-dimensional ground stress measuring device and method

By integrating a distributed fiber optic sensing system and a three-dimensional orientation system, and combining them with a data processing unit, the three-dimensional stress tensor is automatically calculated, solving the problem of high-precision and synchronous measurement of three-dimensional geostress in deep rock masses, and realizing efficient and reliable geostress measurement of deep rock masses.

CN121558227BActive Publication Date: 2026-06-23CHINA COAL RES INST
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Patent Information

Application Number
CN202610085493.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-06-23
Estimated Expiration
2046-01-22

AI Technical Summary

Technical Problem

Existing technologies are insufficient for achieving high-precision, distributed measurement of three-dimensional geostress in deep rock masses, and borehole attitude measurement relies on manual methods, resulting in large errors. This makes it impossible to meet the need for simultaneous monitoring of geostress at multiple depths and in three dimensions.

Method used

A distributed fiber optic sensing system and a three-dimensional orientation system are integrated into the stress meter. Combined with a data processing unit, the borehole orientation data is automatically measured, and the three-dimensional stress tensor is calculated using the borehole local wall stress complete relief method, achieving high-precision, multi-point synchronous measurement.

Benefits of technology

It improves the accuracy, efficiency and reliability of deep rock mass in-situ stress measurement, reduces manual measurement errors and operational complexity, and realizes full-process automation from in-situ data acquisition to stress calculation.

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Abstract

The present disclosure provides a deep rock mass three-dimensional ground stress measuring device and method, and relates to the technical field of geological surveying. The device comprises: a stress gauge integrated with a distributed optical fiber sensor and a three-dimensional electronic compass is installed at a predetermined depth in a borehole; the azimuth and inclination of the borehole are automatically obtained through the three-dimensional electronic compass; the reflected wavelength data is collected through the distributed optical fiber sensor before and after the full stress release operation on the borehole wall surface; the wavelength data and the directional data are transmitted to a data processing unit, which automatically calculates and outputs the three-dimensional ground stress tensor and the principal stress in the geodetic coordinate system according to the principle of full stress release of the local borehole wall surface. Thus, the problems of low efficiency, large error and difficulty in realizing multi-point synchronous in-situ monitoring caused by the complicated manual installation, the dependence on external equipment for posture measurement and the limitations of single-point measurement in the traditional method are solved, and the full-process automatic, high-precision and expandable three-dimensional ground stress in-situ measurement is realized.
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