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A new framework for geometrical investigation and stability analysis of high-position concealed dangerous rock blocks
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.
A new framework for geometrical investigation and stability analysis of high-position concealed dangerous rock blocks
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.
A new framework for geometrical investigation and stability analysis of high-position concealed dangerous rock blocks
Acta Geotech.
Yan, Jianhua (author) / Chen, Jianping (author) / Zhou, Fujun (author) / Zhang, Wen (author) / Zhang, Yansong (author) / Zhao, Mingyu (author) / Ji, Yaopeng (author) / Liu, Yongqiang (author) / Xu, Wanglai (author) / Wang, Qing (author)
Acta Geotechnica ; 18 ; 1269-1287
2023-03-01
19 pages
Article (Journal)
Electronic Resource
English
Block theory , Dangerous rock block , Geometrical characterization , Sichuan–Tibet railway , Stability analysis , UAV photogrammetry Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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