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A new framework for geometrical investigation and stability analysis of high-position concealed dangerous rock blocks

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Abstract

The rock slopes along the Sichuan–Tibet railway are characterized by noncontactless, inaccessible, dramatically fluctuating topography and large-scale areas. Numerous high-position, concealed dangerous rock blocks (HPCDRBs) are located on such slopes, potentially threatening the construction and safety operation of the Sichuan–Tibet railway. To this end, a new framework is proposed for geometrical investigation and stability analysis of HPCDRBs. The main steps of the framework are: (1) establishment of a three-dimensional high-resolution rock surface model using a new unmanned aerial vehicle-based photography method; (2) identification of possible HPCDRBs based on the theory of structure-controlled rock mass; (3) geometrical characterization of possible HPCDRBs utilizing polyhedral models; and (4) application of block theory for the stability analysis of possible HPCDRBs. In this framework, the actual positions and geometric information of these blocks are well-reflected, and the obtained parameters can directly serve the stability analysis. The proposed method is applied to an ultrahigh-steep rock slope located on the left bank of the Kang Yu Qu (KYQ) Bridge of the Sichuan–Tibet railway. A total of 40 HPCDRBs with volumes between 2.1 and 148.2 m3 are determined, and the geometric shapes are mainly hexahedron and heptahedron. The mean sliding orientation of these blocks is 124.6°∠51.4°. A seismic stability analysis is finally conducted to further discuss the stability of the HPCDRBs under a real earthquake. In summary, the collapse of the unstable HPCDRBs may cause single block falls which pose a potential threat to the KYQ Bridge.

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Data availability

Most of the data generated during this study are included in this article, and other datasets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 41941017, U1702241). Acknowledgement for the data support from “China Earthquake Networks Center, National Earthquake Data Center. (http://data.earthquake.cn).” The authors would like to thank the editor and two anonymous reviewers for their comments and suggestions, which helped a lot in making this paper better.

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  1. College of Construction Engineering, Jilin University, Changchun, 130026, China

    Jianhua Yan, Jianping Chen, Wen Zhang, Yansong Zhang, Mingyu Zhao, Yaopeng Ji, Yongqiang Liu, Wanglai Xu & Qing Wang

  2. China Railway First Survey and Design Institute Group CO., LTD, Xi’an, 710043, China

    Fujun Zhou

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  1. Jianhua Yan
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Appendix A

Appendix A

See Table 3.

Table 3 Detailed geometrical information and stability analysis results of the 56 identified possible HPCDRBs
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Yan, J., Chen, J., Zhou, F. et al. A new framework for geometrical investigation and stability analysis of high-position concealed dangerous rock blocks. Acta Geotech. 18, 1269–1287 (2023). https://doi.org/10.1007/s11440-022-01668-5

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