摘要
Abstract
Hangzhou's mountainous scenic areas,rich in tourism resources and undergoing rapid development,are highly susceptible to geological hazards.The frequent occurrence of collapse disasters in these areas necessitates urgent research into their formation mechanics and the development of effective prevention and control measures.This paper focuses on the collapse hazard at Zilai Cave.Through data collection,field investigation,stereographic projection method,and limit equilibrium analysis,it identifies the basic characteristics of the unstable rock mass,analyzes its failure modes and stability,and,based on these findings,proposes preventive measures.The results show that joints and fissures are well developed on the steep bedrock cliffs of Zilai Cave.Three unstable rock masses(W1,W2,and W3),each with a volume of approximately 11 to 25 m3,have been identified in the potential collapse hazard area.This hazard is primarily controlled by three sets of joints and is classified as a small-scale"three-sided unstable rock mass collapse".The failure modes of W1,W2 and W3 are overturning,sliding and overturning,respectively.Under heavy rainfall conditions,their stability coefficients are 0.75,1.29 and 1.26,placing them in unstable,essentially stable and marginally stable states,respectively.Based on the interlocking and constraint effects among the unstable rock masses,an innovative prevention structure—a"triangular support beam combined with randomly placed rock bolts"—is proposed for collapse control.关键词
三面危岩体崩塌/破坏模式/三角支撑梁/防治对策/玉皇山紫来洞Key words
three-sided unstable rock masses collapse/failure mode/triangular support beam/prevention and control measures/Yuhuang Zilai Cave collapse
