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Non-contact ground stress testing device and method based on drilling microscopy digital photography

A test device, non-contact technology, applied in the direction of measuring devices, measuring force, instruments, etc., can solve problems such as low precision, non-reusable probes, and harsh environmental requirements

Active Publication Date: 2015-07-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a non-contact ground stress testing device and method based on drilling microscopic digital photography, which solves the problem of complex operation, harsh environmental requirements, low precision, and susceptibility to temperature, Rock viscosity, electromagnetic interference, probes cannot be reused, and high cost

Method used

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  • Non-contact ground stress testing device and method based on drilling microscopy digital photography
  • Non-contact ground stress testing device and method based on drilling microscopy digital photography
  • Non-contact ground stress testing device and method based on drilling microscopy digital photography

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Embodiment 1

[0054] Embodiment 1: The non-contact ground stress testing device 1 is located in the test device installation borehole 2, the test device installation borehole 2 is located in the initial large-diameter borehole 3, and the test device installation borehole 2 and the initial large-diameter borehole 3 The core 4 is released between them, and the host machine 5 is located outside the initial large-diameter borehole 3;

[0055] The non-contact ground stress testing device 1 includes: an electronic microscopic camera 17, an illuminating lamp 15, a signal processing and control module 111, a signal transmission module 112, a gyroscope 113, a signal acquisition module 18, a mobile power supply 110 and a device shell 115; the two ends of the device shell 115 are respectively connected with the guide piston 11 and the device connector and the rear piston 114; the device shell 115 is provided with an electronic microscopic camera 17, an electronic microscopic camera 17, a gyroscope 113,...

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Abstract

The invention relates to a non-contact ground stress testing device and method based on drilling microscopy digital photography and belongs to ground stress measuring device and method of geotechnical engineering. The device comprises an electronic microscopy camera, a signal processing and control module, a signal transmission module, a gyroscope, a signal collecting module, a portable power source and a device shell. The method includes: fixing the testing device in a device mounting hole, using the electronic microscopy camera to collect the hole wall digital images of the hole during a whole stress relieving process, selecting the representative images before and after the stress relieving, acquiring sub-pixel images through image interpolation, optimizing sub-pixel image analyzing areas and points, setting analyzing traces, calculating to obtain strain values, and calculating the ground stress values and the azimuth angles thereof by the hole partial wall surface stress relieving method theory. The non-contact ground stress testing device and method has the advantages that simple operation and high adaptability are achieved, testing precision can reach one micro strain, strain measuring mark points and analyzing traces are optimized, influence of temperature, rock viscosity and electromagnetic interference is avoided, a probe can be reused, and low cost is achieved.

Description

technical field [0001] The invention relates to a geotechnical engineering ground stress measuring device and method, in particular to a non-contact ground stress testing device and method based on drilling microscopic digital photography. Background technique [0002] In-situ stress is the original stress that exists in the stratum without engineering disturbance, and is the root cause of engineering disasters such as deformation and destruction of rock and earth underground engineering, rock burst, coal and gas outburst, etc. In-situ stress measurement is a necessary prerequisite for the stability analysis of surrounding rocks and the realization of scientific decision-making in the layout, excavation and support design of rock and soil underground engineering. According to different measured physical parameters, in-situ stress testing can be divided into hydraulic fracturing method, acoustic emission method, surrounding rock damage track analysis method and deformation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
Inventor 孟波靖洪文李元海陈坤福许国安
Owner CHINA UNIV OF MINING & TECH
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