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Rock long-term strength determination method based on numerical fitting

A long-term strength and numerical fitting technology, applied in the direction of strength characteristics, the use of stable tension/pressure test material strength, measuring devices, etc., can solve problems such as fuzzy turning points of strain rate curves, and achieve long-term strength accuracy and data processing. simple effect

Active Publication Date: 2020-09-18
CHINA UNIV OF MINING & TECH
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Problems solved by technology

For the case where the rock rheology is not obvious, the turning point of the constant strain rate curve is blurred, and it is difficult to determine directly visually, and there are certain differences in the characteristics of the ultimate strain trajectory under different confining pressure conditions. The problem

Method used

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  • Rock long-term strength determination method based on numerical fitting
  • Rock long-term strength determination method based on numerical fitting
  • Rock long-term strength determination method based on numerical fitting

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] refer to Figure 1-7 Shown, the rock long-term strength determining method based on numerical fitting of the present invention, it may further comprise the steps:

[0041] Step 1: Sampling on site, making rock specimens, and conducting wave velocity tests, grouping specimens with a difference in wave velocity within 10% into a group; conducting conventional compression tests on specimens to obtain rock compressive strength σ c and as figure 2 For the full stress-strain curve shown, see figure 2 As shown, the rock compressive strength σ c 15.1MPa;

[0042]Step 2: Select the same group of specimens for graded loading creep test, and record the axial compressive strain and time change data of the specimen under different loading stress lev...

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Abstract

The invention discloses a rock long-term strength determination method based on numerical fitting, which comprises the steps of carrying out a conventional compression test to obtain rock compressivestrength and a total stress-strain curve, carrying out a graded loading creep test to determine a creep curve equation of a rock test piece and a final strain value when rock deformation tends to be stable, and taking a stress value corresponding to an intersection point of a final strain value fitting curve and the total stress-strain curve of the rock test piece as long-term strength. Accordingto the method, the intersection point of the final strain fitting curve and the total stress-strain curve is obtained through numerical fitting, the long-term strength of the rock is determined, the problems that inflection points are fuzzy, subjective judgment is difficult and the like in the long-term strength determining process are solved, and the method is simple, effective, accurate and reliable in result, rapid in process and programmable.

Description

technical field [0001] The invention relates to the field of rock mechanics and engineering, in particular to a method for determining long-term rock strength based on numerical fitting. Background technique [0002] The long-term strength of rock refers to the strength of rock under long-term load, that is, when the external load is greater than a certain value, the rock will always undergo creep deformation over time and eventually fail; when the external load is less than a certain value, the rock will creep The deformation rate gradually decreases to zero, and the creep deformation tends to converge. This stress critical value is the long-term rock strength value. Practice has shown that the instability and failure of rock mass is mostly the result of its long-term external load. Therefore, it is necessary to carry out long-term strength measurement research of rock mass to provide scientific basis for rock mass support design and stability evaluation. [0003] In the ...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0071G01N2203/0075G01N2203/0218G01N2203/0676G01N2203/0682
Inventor 徐强姚强岭夏泽于利强王伟男朱柳回新冬
Owner CHINA UNIV OF MINING & TECH
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