Extraction of the discontinuity orientation from a digital surface model

XUAN Chengqiang; ZHANG Yangsong; XU Wentao

doi:10.16030/j.cnki.issn.1000-3665.202104029

2022 Vol. 49, No. 1

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XUAN Chengqiang, ZHANG Yangsong, XU Wentao. Extraction of the discontinuity orientation from a digital surface model[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 75-83. doi: 10.16030/j.cnki.issn.1000-3665.202104029

Citation:

XUAN Chengqiang, ZHANG Yangsong, XU Wentao. Extraction of the discontinuity orientation from a digital surface model[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 75-83. doi: 10.16030/j.cnki.issn.1000-3665.202104029

Extraction of the discontinuity orientation from a digital surface model

Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu　210094, China

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Corresponding author: ZHANG Yangsong, zhangys@njust.edu.cn

Received Date: 12 April 2021

Revised Date: 05 July 2021

Publish Date: 15 January 2022

Abstract

Abstract

The traditional field contact measurement for obtaining parameters of the rock mass discontinuity is of low efficiency and big workload, and the accuracy of the results are affected by human factors. In this paper a method is presented to automatically recognize the discontinuity based on the three dimensional (3D) digital surface model (DSM) of rock mass obtained with the digital photogrammetry and structure from motion (SFM) algorithm. The steps of rock mass DSM reconstruction include collecting rock mass images, matching image features based on the Scale-Invariant Feature Transform (SIFT) algorithm, reconstructing sparse point cloud, encrypting point cloud, and reconstructing the rock mass surface model. The main flow of the discontinuity recognition method include smoothing the DSM of rock mass, changing the searching radius and the angle threshold to split model plane, searching the discontinuity based on the regional growth principle, and fitting the discontinuity based on random sampling consistency to get the orientation. The method is applied to the underground experimental roadway in the Beishan area of Gansu, and the reconstruction of 3D digital surface model of roadway and the orientation acquisition of discontinuities are realized. The discontinuities are also mapped on the roadway model by groups. A comparison the results with those of the manual field measurement method and the existing discontinuity recognition software shows that the method proposed in this paper is of good accuracy and can provide a certain reference for engineering applications.
- discontinuities recognition /
- photogrammetry /
- structure from motion /
- digital surface model /
- regional growth

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References

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