地质科技通报2025，Vol.44Issue(2)：67-77,11.DOI:10.19509/j.cnki.dzkq.tb20240496
基于非接触测量楔形危岩体稳定性快速评价
Rapid analysis of the stability of a wedge-shaped unstable rock mass on the basis of non-contact measurements
摘要
Abstract
[Objective]With the frequent occurrence of landslide disasters in China,it is crucial to enhance research on unstable rock masses and slopes.Traditional analysis methods have limitations in quantifying certain factors,necessitating improvements.This paper adopts a non-contact measurement method to obtain and analyze para-meters of wedge-shaped unstable rock masses and assess their stability under different working conditions.[Methods]Taking the wedge-shaped unstable rock mass in the upper reservoir of a pumped storage power station as an example,this study reveals the basic features and stability-influencing factors of the unstable rock mass based on detailed engineering geological field investigations.A long-distance 3D laser scanning system was used to collect high-precision point cloud data of the slope.Through preprocessing,spatial parameters of the wedge-shaped unstable rock mass were obtained.The critical surface plane was determined using least-squares fitting to calculate the slope angle and height of the wedge-shaped body.Local point cloud data were fitted to determine the normal vector,which was then used to calculate discontinuity orientations.The Alpha shape method was employed to calculate the volume of the unstable rock mass,with the most suitable radius parameter determined by comparing it with the actual unstable rock mass.The stability of the unstable rock mass was evaluated using the limit equilibrium method.[Results]The results show that under natural conditions,the stability coefficient of the wedge-shaped unstable rock mass is 1.131,indicating an essentially stable state;under rainstorm conditions,the stability coefficient drops to 0.896,indicating instability;and under seismic conditions,the stability coefficient is 0.917,also indicating instability.[Conclusion]This paper applies non-contact measurement and intelligent recognition techniques to the stability analysis of wedge-shaped unstable rock masses.The total analysis time was 102 minutes,significantly improving the efficiency of stability analysis and reducing risks associated with engineering construction.The proposed method provides a reliable alternative for assessing the stability of complex geological structures,enhancing safety and reliability in geotechnical engineering projects.关键词
楔形危岩体/稳定性评价/非接触测量/智能识别/极限平衡法Key words
wedge-shaped unstable rock mass/stability evaluation/non-contact measurement/intelligent identification/limit equilibrium method分类
建筑与水利引用本文复制引用
张航,胡海瑞,朱杰清,胡彬,葛云峰,陈钱..基于非接触测量楔形危岩体稳定性快速评价[J].地质科技通报,2025,44(2):67-77,11.基金项目
国家自然科学基金项目(42477177) （42477177）
湖北省自然科学基金计划联合基金重点项目(2024AFD005) （2024AFD005）
