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Rock long-term strength qualitative test method based on acoustic emission event occurrence rate

A technology of event occurrence and long-term strength, which is applied in the direction of strength characteristics, material analysis using acoustic wave emission technology, and testing material strength by applying stable tension/pressure. It can solve the problems of not considering the time effect of materials and improve safety performance. Effect

Inactive Publication Date: 2020-11-03
BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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Problems solved by technology

However, previous studies have not considered the time effect of materials under stress

Method used

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  • Rock long-term strength qualitative test method based on acoustic emission event occurrence rate
  • Rock long-term strength qualitative test method based on acoustic emission event occurrence rate
  • Rock long-term strength qualitative test method based on acoustic emission event occurrence rate

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Embodiment 1

[0031] This embodiment discloses a qualitative test method for the long-term strength of rock based on the occurrence rate of acoustic emission events, including the following steps:

[0032] Step 1: Preparation and placement of rock sample 1, see attached Figure 2(a)-Figure 2(b) As shown, the specific implementation is as follows:

[0033] In this embodiment, the rock samples are selected from limestone with a buried depth of about 800 meters in a metal mine, and the rock samples are processed into a cylinder with a diameter of 50 mm and a height of 100 mm; Not more than 0.25°

[0034] Step 2, carry out longitudinal wave velocity measurement;

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Abstract

The invention discloses a rock long-term strength qualitative test method based on an acoustic emission event occurrence rate, and te method comprises the following steps: applying a load to a test piece, and acquiring stress data in the whole loading process; respectively judging the acoustic emission events of the test piece in different full-load stages to obtain acoustic emission event occurrence rates in different stress states; for different full-load stages, considering the time efficiency, and determining that the stress is the long-term strength of the rock when the occurrence rate ofan acoustic emission event is reduced firstly and then increased. According to the technical scheme, the long-term strength of the rock under the action of the constant load can be qualitatively determined, and the safety performance of engineering under the action of the long-term load can be effectively improved.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering, in particular to a qualitative test method for long-term rock strength based on the occurrence rate of acoustic emission events. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, more and more deep-seated projects have been built in China, such as the Sichuan-Tibet Railway, Jinping II Hydropower Station, etc. The establishment of deep engineering disturbed the original state of stress balance, resulting in obvious stress concentration near the excavation site of the engineering. Accompanied by the excavation of the project, disasters such as chipping, roof fall and rockburst occur frequently. In addition, some disasters still occurred some time after the excavation was completed. How to determine the long-term stability of rock o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N29/14
CPCG01N3/08G01N29/14G01N2203/0003G01N2203/0019G01N2203/0066G01N2203/0252G01N2203/0266G01N2203/0658G01N2291/0232G01N2291/0289G01N2291/106
Inventor 侯奎奎王剑波胡忠强程力刘焕新朱明德张皓钦
Owner BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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