Method for determining rock sealing stress

A technique for determining methods, rocks, applied in the field of geological surveys to achieve high accuracy

Active Publication Date: 2021-09-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Rock sealing stress is considered to be an important cause of rock engineering disasters. However, the understanding of rock sealing stress is still in the stage of conceptualization and phenomenon interpretation. There are no related patents and literature related reports on the determination method of rock sealing stress.

Method used

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  • Method for determining rock sealing stress
  • Method for determining rock sealing stress
  • Method for determining rock sealing stress

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Rock sample processing

[0071] Quartz vein rocks were cut along the rock plane and vertical plane, and the sample size was 20mm×20mm×10mm. The way to establish its coordinate system is as follows: figure 2 shown.

[0072] (2) Determination of rock quartz content by cathodoluminescence

[0073] The quartz content was calculated by cathodoluminescence microscopy and Image J software.

[0074] (3) Obtain sample X-ray diffraction spectrum

[0075] Equipment parameters: Bruker D8 Advance X-ray diffractometer, equipped with Yula ring, using Cu target, wavelength Focus spot, working voltage and current: 40kV, 40mA; optical path: focusing optical path-Ni filter-collimator tube 2.0mm.

[0076] Perform a full spectrum scan of the assay point. Angle range: 10°-158°, scanning step: 0.1°, dwell time per step: 0.15s.

[0077] (4) Select the measurement crystal plane

[0078] Perform a phase search, match the #99-0088PDF card, and select the (132) crystal plane for meas...

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Abstract

The invention provides a rock sealing stress determination method, relates to the technical field of geological survey, and can realize accurate measurement of rock sealing stress and provide a basis for geological survey. The method comprises the following steps of S1, measuring mineral components of rock, selecting the rock meeting test conditions as a sample to be tested, and determining a coordinate system; S2, acquiring an X-ray diffraction spectrum of the to-be-measured sample, and determining a measured crystal face according to the X-ray diffraction spectrum; S3, carrying out a step-by-step scanning test on the measured crystal face; S4, calculating the sealing stress according to the test result of S3; and S5, calculating the main stress size and direction of the closed stress. The method is suitable for the process of measuring the closed stress of the rock.

Description

technical field [0001] The invention relates to the technical field of geological survey, in particular to a method for determining the sealing stress of rocks. Background technique [0002] Closure stress is a kind of self-equilibrium internal stress that remains in the material after the external force or uneven temperature field is eliminated. Closed stress is a common physical phenomenon in the field of metal processing. For example, closed stress often exists in the welding parts of metal materials, which has an important impact on the safety and fatigue strength of metal components. [0003] Similar to the residual stress caused by the mechanical processing and strengthening process of metal materials, the closed stress in rocks is a kind of stress preserved by rock materials in the specific temperature and pressure environment of the geological structure process, and has the property of self-balancing internal stress. Since rock is a heterogeneous, anisotropic and in...

Claims

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Application Information

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IPC IPC(8): G01N23/207G01N23/2055
CPCG01N23/207G01N23/2055
Inventor 王涛佟业蒙王莉黄维李爱国
Owner UNIV OF SCI & TECH BEIJING
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