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A DIC technology-based method and system for on-site rock mass crack propagation pattern recognition in holes

A technology for crack propagation and pattern recognition, which is applied in the field of recognition of crack propagation patterns in on-site rock excavation and unloading, and achieves the effects of fast calculation speed, convenient operation and high accuracy

Active Publication Date: 2019-03-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, DIC technology has only been developed in the field of experimental rock mechanics and rock mesomechanics, but there are no reports on the application of DIC technology in underground engineering and combined with drilling camera technology to study the dynamic propagation mode and path of cracks.

Method used

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  • A DIC technology-based method and system for on-site rock mass crack propagation pattern recognition in holes
  • A DIC technology-based method and system for on-site rock mass crack propagation pattern recognition in holes
  • A DIC technology-based method and system for on-site rock mass crack propagation pattern recognition in holes

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Embodiment 1

[0041] See attached figure 2 , 3 , 4, the present invention is based on DIC technology on-site rock mass crack propagation pattern recognition system in the hole, the recognition system includes a high-definition probe 2, a host 3, a push rod 5, a guide rod 6, and a cable 8; the high-definition probe 2 passes through the cable 8 is electrically connected to the host 3; two guide rods 6 are fixedly connected to the bottom of both sides of the HD probe 2 through black tape 7, and a push rod parallel to the axis of the HD probe 2 is fixedly connected to the center of the end face of the HD probe 2 5;

[0042] The host 3 includes an image viewer 4, DIC analysis and calculation software 12;

[0043] In this embodiment, the guide rod is a glue stick;

[0044] HD probe 2 is a 4D ultra-high-definition fully intelligent in-hole TV (GD3Q-GA type produced by Wuhan Good Technology Co., Ltd.);

[0045] DIC analysis and calculation software 12 is Gom correlate professional V8 software ...

Embodiment 2

[0047] See attached figure 2 , 3 , 4, 5, for a certain large-scale underground phosphate mine, adopt a kind of on-the-spot rock mass crack propagation pattern recognition method based on DIC technology of the present invention to identify its on-site rock mass crack propagation pattern in the hole.

[0048] Basic situation of the mine:

[0049] According to the specific geological data and mining technical conditions of the mining area, the development depth of the mine (the lower phosphorus 5 panel in the middle section of 640) has reached 600-700m from the surface, the vertical depth has exceeded 800m, the average thickness of the ore body is 6.07m, and the dip angle is 20-45. °, the ore body is mined using the strike longwall method. After drilling and coring the phosphate ore body in a certain stope in the panel area, it was found that the phosphate ore body and its surface have a relatively obvious difference in natural gray scale, which is because the mineral particle...

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Abstract

A method and a system for identifying on-site in-hole rock body crack propagation patterns based on DIC technology are disclosed. The method is as follows: horizontal boreholes are bored in an underground engineering rock body excavation site, and by synergistic effect of borehole camera technology and DIC software, a borehole three-dimensional histogram showing fitting plane space distribution of excavation-unloading-induced cracks; and according to an included angle alpha between a crack fitting plane in the borehole three-dimensional histogram and the rock core axis in the borehole three-dimensional histogram, whether the crack is a plate-fracture crack or a shear crack can be determined. The system comprises a high definition probe, a host, a push rod, guide rods and a cable, the high definition probe is connected electrically with the host by the cable, the lower parts of the two sides of the high definition probe is connected fixedly with the two guide rods, and the end surface of the tail of the high definition probe is connected fixedly with the push rod. Through organic bond of the borehole camera technology and the DIC technology, the excavation-unloading-induced cracks and original cracks can be effectively differentiated, the authenticity and reliability of the dynamic monitoring and recognition of on-site rock body excavation-induced cracks can be ensured, and the system has the advantages of convenient operation, reliable monitoring and high precision, and is especially suitable for deep-buried high-stress hard rock containing a certain natural gray level difference.

Description

technical field [0001] The invention relates to a method and a system for identifying a crack propagation mode of excavation and unloading of a rock mass in a field hole, in particular to a method and a system for identifying a pattern of a crack propagation induced by an excavation and unloading of a rock mass in a field hole based on DIC technology. Background technique [0002] During the construction of underground engineering, due to the redistribution of stress due to the excavation of rock mass, a certain range of loosening zone (plastic zone) is formed around the excavation space. In hard rock mines or tunnel chambers prone to rockbursts, damage phenomena such as slab cracks and spall cracks often occur in some stress concentration areas. In addition, according to the action mechanism, structural surface rockbursts can also be divided into slip type, shear fracture type and tension crack type. Slab cracking, spalling, and rockburst are all common failure phenomena o...

Claims

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Application Information

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IPC IPC(8): G01N21/84
CPCG01N21/84
Inventor 李夕兵冯帆李地元宫凤强王少锋陈英
Owner CENT SOUTH UNIV
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