Acta Geodaetica et Cartographica Sinica ›› 2022, Vol. 51 ›› Issue (10): 2093-2106.doi: 10.11947/j.AGCS.2022.20220359

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Fine identification and characterization of rock mass discontinuities and its application using a digital photogrammetry system

XU Wentao1, LI Xiaozhao1,2, ZHANG Yangsong3, ZHU Honghu1, ZHANG Wei1, XUAN Chengqiang3   

  1. 1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
    2. Key Laboratory of Deep Geomechanics and Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;
    3. Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2022-05-28 Revised:2022-06-30 Published:2022-11-05
  • Supported by:
    The National Natural Science Foundation of China (No. 42230704); The National Key Research and Development Program of China (No. 2018YFC1505104); The Geological and Mineral Research Project of Jiangsu Province (No. 2021-KY-01)

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Abstract: Identification of rock mass discontinuity and characterization of characteristic parameters are of fundamental significance to the study of rock mass behaviour and instability mechanism. In this paper, a photogrammetric system consisting of UAV aerial survey, GPS-RTK and close-range photogrammetry was employed to systematically investigate the rock mass discontinuities at different scales in Beishan area, Gansu province. The digital orthophoto map (DOM) of this site and 3D reconstructed digital surface model (DSM) of outcrops were established by using the ground object photos obtained from different perspectives. The effective interpretation of rock mass discontinuity information and characterization of characteristic parameters were realized by using digital identification and statistical methods. Studies of typical outcrops and areas show that the photogrammetric system can promote the fine investigation and identification of rock mass discontinuities from different dimensions and scales. According to the variation feature of discontinuity characteristic parameters, the fault affected zone of F31 fault in Beishan area were investigated. It can be preliminarily concluded that the affected range of F31 fault on hanging-wall rock mass integrity was approximately 150~200 m, and the influence form was negative exponential type.

Key words: photogrammetric system, digital model, multiscale discontinuity, characteristic parameter, fault-affected zone

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