31 / 2025-07-10 16:27:26

STUDY ON THE GENETIC MECHANISMS OF WINTER LANDSLIDE HAZARDS IN THE WUMENG MOUNTAIN AREA: A CASE STUDY OF THE LIANGSHUI VILLAGE LANDSLIDE IN ZHENXIONG, YUNNAN

Wumeng mountain area ；winter hazards；fissure development；Liangshui village landslide；spatiotemporal coverage effect

Abstract As a typical high-incidence area of geological hazards, the Wumeng Mountain region is characterized by its fragile ecological environment and complex engineering geological background. Against the backdrop of global extreme climate change, catastrophic winter events occur frequently in this region. The mechanisms of winter disasters are intricate, with high warning difficulty and severe hazard intensity, posing a significant threat to the lives and property of local residents. To deeply investigate the disaster-forming mechanisms of winter landslides and collapses in the Wumeng Mountain region, this study takes the Liangshui Village landslide in Zhenxiong County, Yunnan Province, as a case study. Through comprehensive field investigations, laboratory experiments, theoretical analysis, and comparative studies, the research systematically elucidates the multi-factor coupling mechanism of disaster-pregnancy, disaster-inducement, and disaster-triggering in the Liangshui Village landslide. It identifies the key triggering factors for winter disasters in the Wumeng Mountain region and proposes relevant prevention and mitigation measures. The findings reveal that the rock and soil mass at the shear outlet of the Liangshui Village landslide underwent long-term physical weathering, exhibiting consistent mineral composition but relatively loose mineral structure. The lithological materials in Liangshui Village demonstrate high water sensitivity, where hydration leads to the dissolution of internal minerals, causing macroscopic damage to the rock surface and degradation of physical and mechanical properties. The landslide is primarily controlled by both internal and external factors: the highly developed fissures provide a disaster-pregnant environment for landslide occurrence, while the spatiotemporal coverage effect-induced "heat transfer–vapor migration–stress variation" serves as the critical triggering factor. This research offers a novel perspective for studying the mechanisms of winter landslides and collapses in the Wumeng Mountain region, contributing significantly to the improvement of geological hazard prevention theory and the enhancement of regional disaster mitigation capabilities.