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Step surface flatness statistical method based on close-range photogrammetry

A measurement technology and close-up photography technology, which is applied in the field of evaluation of the flatness of the step surface after the blasting of the steps, can solve the problems of large manpower and material resources, working time, low precision, large errors, etc., and achieve easy preservation, improve statistical accuracy, and evaluate intuitive effect

Inactive Publication Date: 2014-12-10
WUHAN UNIV
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Problems solved by technology

These methods all have problems such as large errors and low precision, and require a lot of manpower, material resources and working time, and the reliability of the statistical results is not high. They can only evaluate the flatness effect of the blasting operation from a macro perspective.

Method used

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  • Step surface flatness statistical method based on close-range photogrammetry
  • Step surface flatness statistical method based on close-range photogrammetry

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 , figure 2 As shown, a statistical method for step surface flatness based on close-range photogrammetry technology includes the following steps:

[0022] (1) After the steps on the foundation surface of a hydropower station were blasted, the slag pile on the step surface after blasting was cleaned up, and the loose and broken rock blocks on the surface were removed, leaving a complete step surface after blasting.

[0023] (2) Arrangement of control points on the post-burst step surface. In theory, only 3 control points are needed. In actual operation, more than 4 control points are often arranged to reduce the error of the DEM model (the more control points, the more The easier the match, the less error the resulting DEM will have). For the selection of control points, it can be a protruding stone, or a measuring point marked with paint or the like. ...

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Abstract

The invention discloses a step surface flatness statistical method based on close-range photogrammetry. The method includes: using close-range photogrammetry to perform fast non-contact measuring on a step surface after explosion to obtain the spatial three-dimensional information of the step basic surface of an explosion area, using image processing software to perform objective image analysis to obtain the three-dimensional coordinates of all the points of the step surface, building the three-dimensional DEM model of the step surface, and generating the spatial three-dimensional image of the step surface; building and designing the expected spatial surface function of the basic surface after explosion, statistically measuring the distance from all the three-dimension points of the step surface to the step surface, and calculating the height difference between the highest point and the lowest point. The method has the advantages that flatness statistical precision can be increased greatly, significance for building a flatness evaluation system is achieved, the acquired three-dimensional data is easy to store, and a complete database system can be built favorably.

Description

technical field [0001] The invention relates to a statistical method for step surface flatness based on close-range photogrammetry technology, which is suitable for evaluating the step surface flatness after step blasting in the fields of mining, water conservancy and hydropower, transportation and other geotechnical engineering fields. Background technique [0002] In open-pit engineering, step blasting has the advantages of large mining volume, simple operation, and high construction efficiency, and has become the most commonly used excavation method at present. In step blasting, due to the improper selection of blasting parameters and the limitation of on-site construction technology, rock ridge foundations that are difficult to excavate will be left on the step surface. The existence of the blasting foundation will seriously affect the efficiency of shovel loading and transportation, and will also affect the implementation of the next blasting operation. For some key pa...

Claims

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Application Information

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IPC IPC(8): G01B11/30
Inventor 刘亮严鹏卢文波陈明张玉柱胡浩然
Owner WUHAN UNIV
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