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Novel acoustic-emission ground-stress-field measuring technology based on plane stress condition

A technology of plane stress and measurement technology, which is applied in the direction of material analysis using acoustic wave emission technology, can solve problems such as expensive, limited development, cumbersome and complicated operations, etc., to achieve accurate measurement, strong operability, and save measurement costs Effect

Active Publication Date: 2011-01-26
CHINA NERIN ENG +1
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Problems solved by technology

Therefore, this method can only be used in relatively complete rocks. More importantly, this method is very expensive and complicated to operate, so it also limits its development to a certain extent.

Method used

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  • Novel acoustic-emission ground-stress-field measuring technology based on plane stress condition
  • Novel acoustic-emission ground-stress-field measuring technology based on plane stress condition
  • Novel acoustic-emission ground-stress-field measuring technology based on plane stress condition

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Embodiment Construction

[0014] Theoretical Basis of Acoustic Emission Measurement under Plane Stress The measurement of ground stress is often based on the plane state. The in-situ stress measurement borehole is regarded as a circular hole in an infinite thin plate, and the stress direction is parallel to the horizontal plane. According to the calculation formula of elastic mechanics, two pairs of horizontal principal stresses σ 1 and σ 2 , then the normal stress and shear stress on any section are (such as figure 1 shown):

[0015] σ θ = 1 2 ( σ 1 + σ 2 ) + 1 2 ( ...

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Abstract

The invention discloses a novel acoustic-emission ground-stress-field measuring technology based on a plane stress condition, which comprises the following concrete steps of: supposing that the vertical direction is a known principal stress direction sigmaZ, and obtaining the magnitude of a principal stress according to a formula sigmaZ=gammad; in the horizontal direction, sampling a rock sample in the two mutually vertical directions and the directions with included angle of 45 degrees with the two directions; and loading and recording data, analyzing to obtain a Kaiser point, computing the magnitudes and the directions of the two principal stresses in the horizontal direction according to a theoretical computing formula, and adding the supposed sigmaZ to realize the three-dimensional stress measurement of a ground stress. The novel acoustic-emission ground-stress-field measuring technology based on the plane stress condition is a novel ground-stress-field testing technology, can make up for the deficiency of a traditional testing method, simultaneously can greatly save the measuring consumption, has the advantages of strong operability, accurate measurement and the like, is combined with means, such as rock mass mechanical testing, numerical simulation analysis and the like, can supply a powerful scientific basis for geotechnical engineering design and is a brand-new and internationally-advanced ground-stress-field testing technology.

Description

technical field [0001] The invention relates to a geotechnical engineering geostress testing technology, in particular to a novel acoustic emission geostress field measurement technology based on plane stress conditions. Background technique [0002] With the rapid development of the national economy, the stability problems encountered in construction projects such as mining, transportation, and water conservancy construction have become increasingly prominent. A large number of geotechnical engineering examples show that the magnitude and direction of the maximum principal stress in the ground stress have a great influence on the stability of the project, and in many places the horizontal ground stress is higher than the vertical ground stress. In recent years, in-situ stress measurement methods are mainly based on traditional acoustic emission method, hydraulic fracturing method and hollow inclusion strain measurement technology. [0003] When rock materials are subjected...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14
Inventor 许振华乔兰王清来李远
Owner CHINA NERIN ENG
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