Linfeng Wang, Ning Tang, Hui Jiang, Huafeng Deng, Zhizhong Yang, Bo Cai
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引用次数: 0
Abstract
The columnar perilous rocks (CPR) along the Three Gorges Reservoir area are characterized by noncontactless, inaccessible, and large volume, potentially threaten the safety of the Yangtze River Golden Channel. To this end, based on point cloud data, a new algorithm for discontinuity plane identification and parameter extraction is proposed, which forms a new framework for stability analysis of CPR. This algorithm overcomes the disadvantage of large errors caused by fixed K values in KNN algorithm through adaptive K values, and utilizes coplanarity to detect plane identification performance. Based on the spatial relationship between discontinuity planes orientations and normal vectors, as well as the geometric relationship between the trace length and spacing in point cloud space, formulas for calculating the orientations, trace length, and spacing are obtained. The effectiveness of the algorithm was verified using point cloud data from Zengziyan CPR, with a point cloud pass rate of 99.6%. Five sets of discontinuity planes were identified, which were basically consistent with the actual surveyed discontinuity planes. The maximum errors in identifying trace length and spacing were 7 cm and 8 cm, respectively. Finally, this framework is applied to the Longmenzhai CPR in the Three Gorges Reservoir area. The results indicate that the maximum identification error of orientation is 3.9°. The maximum relative errors of trace length and spacing recognition are 1.53% and 1.51% respectively, and the error values are both in centimeter level. Through kinematic analysis and safety factor calculation, it is believed that there is a possibility of sliding failure and compression-shear failure in Longmenzhai CPR. The new framework for CPR investigation can accurately identify discontinuity planes, extract parameter information, and determine the stable state of CPR, which can provide reference for similar investigations.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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