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Method for measuring deformation of geotechnical sample through photogrammetry

A technology for photogrammetry and geotechnical testing, applied in the field of geotechnical engineering, which can solve the problems of limited data and waste of time

Inactive Publication Date: 2019-06-25
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, for the test operator, it is necessary to stay around the test instrument for a long time, which is a waste of time and the data that can be read is limited

Method used

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  • Method for measuring deformation of geotechnical sample through photogrammetry
  • Method for measuring deformation of geotechnical sample through photogrammetry
  • Method for measuring deformation of geotechnical sample through photogrammetry

Examples

Experimental program
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Embodiment

[0043] (1) Before the unconfined compressive strength test starts, measure the height of the test soil sample 3 as h 1 , put the test soil sample 3 into the strain-controlled unconfined compressibility instrument 4, and arrange two in the forward and tangential directions: the first industrial camera 1 and the second industrial camera 2, according to the height h of the test soil sample 3 1 To determine the focal length f and the object distance u, to ensure that the test soil sample 3 can appear completely and clearly in the shooting center, such as figure 1 shown.

[0044] (2) Start testing and shooting, and set a shooting interval of 5 seconds.

[0045] (3) After the test is completed, the soil sample is taken out, and the obtained photo is imported into the image processing software. After the image processing software analyzes the image, the deformed boundary of the test soil sample 3 is obtained, and the pixels corresponding to the height of the test soil sample 3 are o...

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Abstract

The invention relates to a method for measuring the deformation of a geotechnical sample through photogrammetry. According to the method of the invention, as for a geotechnical test for measuring thedeformation property of a soil body by using air as a medium, an industrial camera can be arranged at a certain distance from the main deformation surface of a soil sample before the test so as to record the change process of the soil sample; obtained photos are imported into image processing software; the software can extract the contour of the soil sample from the photos through color comparison, and obtain the pixel value of an area occupied by the soil sample before the change of the soil sample and the pixel value of an area occupied by the soil sample after the change of the soil sample;and therefore, the deformation amount of the boundary change of the soil sample is calculated; and the height or area of the deformed soil sample can be obtained through conversion calculation. A modern close-range photogrammetry technology is applied to a geotechnical test, and therefore, the deformation of the soil sample can be measured more accurately, and the efficiency of basic testers andthe accuracy of test data can be improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for measuring the deformation of a geotechnical sample by photography. Background technique [0002] In unconfined compressive strength tests, shrinkage tests and other geotechnical tests with air as the medium, the height of the soil sample is often measured by instruments such as dial indicators, and then the rate of change in the axial direction of the soil sample is calculated; while the volume change The rate is calculated manually, and the accuracy of the data needs to consider the error of the instrument and the human error in the reading. Furthermore, for the test operator, it is necessary to stay around the test instrument for a long time, which wastes time and the data that can be read is limited. [0003] Due to the above reasons, the experimenters are often unable to completely draw the deformation curve of the soil sample according to the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01N3/06G01N3/08G01N33/24
Inventor 张华倪明孚
Owner CHINA THREE GORGES UNIV
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