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Geoscience ›› 2025, Vol. 39 ›› Issue (04): 908-919.DOI: 10.19657/j.geoscience.1000-8527.2025.035

• Tectonic Geology • Previous Articles     Next Articles

Research on Key Issues of Stability of Typical Dangerous Rock Masses in the Changxing Formation, Guizhou Province

QIN Hongliang1(), ZHAO Cui2,*(), ZHU Yuhua1, HU Rong1, WU Bo1, HUANG Xinxin1, HUANG Guangcai1   

  1. 1. Guizhou Geological Survey, Guiyang, Guizhou 550081, China
    2. No.111 Geological Team, Guizhou Bureau of Geology and Mineral Exploration & Development, Guiyang, Guizhou 550081, China
  • Online:2025-08-10 Published:2025-08-27
  • Contact: ZHAO Cui

Abstract:

For a long time, key issues such as the formation mechanism of dangerous rock masses, the possibility of collapse, main triggering factors, and the impact range of collapse have not been effectively solved. This study takes typical dangerous rock masses in the Changxing Formation of Guizhou as the research object, and systematically investigates their formation mechanism, stability, and impact range by comprehensively applying methods including field investigation, engineering survey, rock mechanics test, mathematical statistics, stereographic projection, limit equilibrium method, numerical simulation, and correlation analysis. The results show that the formation mechanism of dangerous rock masses in this area is as follows: the hard limestone of the Changxing Formation forms steep cliff landforms, and fractures are generated under the action of various combined forces; the lithological combination of “hard on top and soft at the bottom” forms concave rock cavities at the bottom of cherty limestone in the Changxing Formation, thus forming dangerous rock masses at the free face of surface cliffs. The conclusions of quantitative calculation and qualitative analysis of dangerous rock mass stability are basically consistent: 3 individual dangerous rock masses are in a sub-stable state, and 3 are in a basically stable state. The maximum impact distance of dangerous rock mass collapse is 345 m, and the rockfall impact range is about 0.36 km?. The study indicates that the dangerous rock masses in the study area mainly result from the combined action of factors such as rock strength, chemical composition, internal and external forces, and characteristics of stratigraphic-lithological combinations. Within the time scale of several decades of human lifespan, the overturning moment stems from water pressure, and rainfall is the most important triggering factor for toppling collapses in this area. The collapse travel distance and total kinetic energy are positively correlated with the volume of rockfall blocks, respectively, while the bounce height has no correlation with the volume of rockfall blocks. This research has certain scientific guiding significance for the prevention and control of similar dangerous rock mass disasters in karst mountainous areas of Guizhou.

Key words: Changxing Formation, dangerous rock mass, stability analysis, numerical simulation, impact range of collapse

CLC Number: